Pow3r: stage 1 (#4208)

Co-authored-by: 20kdc <asdd2808@gmail.com>

Content.Client/Content.Client.csproj.DotSettings

@@ -0,0 +1,2 @@
+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=power_005Cvisualizers/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>

Content.Client/Doors/AirlockVisualizer.cs

@@ -1,5 +1,6 @@
 using System;
 using Content.Client.Wires;
+using Content.Client.Wires.Visualizers;
 using Content.Shared.Audio;
 using Content.Shared.Doors;
 using JetBrains.Annotations;

Content.Client/Entry/IgnoredComponents.cs

@@ -55,7 +55,7 @@ namespace Content.Client.Entry
             "AccessReader",
             "IdCardConsole",
             "Airlock",
-            "WirePlacer",
+            "CablePlacer",
             "Drink",
             "Food",
             "FoodContainer",
@@ -73,6 +73,7 @@ namespace Content.Client.Entry
             "StorageFill",
             "Mop",
             "Bucket",
+            "CableVis",
             "Puddle",
             "CanSpill",
             "SpeedLoader",
@@ -105,12 +106,11 @@ namespace Content.Client.Entry
             "PowerSupplier",
             "PowerConsumer",
             "Battery",
-            "BatteryStorage",
             "BatteryDischarger",
             "Apc",
             "PowerProvider",
-            "PowerReceiver",
-            "Wire",
+            "ApcPowerReceiver",
+            "Cable",
             "StressTestMovement",
             "Toys",
             "SurgeryTool",
@@ -273,6 +273,8 @@ namespace Content.Client.Entry
             "ExplosionLaunched",
             "BeingCloned",
             "Advertise",
+            "PowerNetworkBattery",
+            "BatteryCharger",
         };
     }
 }

Content.Client/Light/Visualizers/EmergencyLightVisualizer.cs

@@ -0,0 +1,23 @@
+using Content.Shared.Light.Component;
+using Robust.Client.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Client.Light.Visualizers
+{
+    [DataDefinition]
+    public sealed class EmergencyLightVisualizer : AppearanceVisualizer
+    {
+        public override void OnChangeData(AppearanceComponent component)
+        {
+            base.OnChangeData(component);
+
+            if (!component.Owner.TryGetComponent(out SpriteComponent? sprite))
+                return;
+
+            if (!component.TryGetData(EmergencyLightVisuals.On, out bool on))
+                on = false;
+
+            sprite.LayerSetState(0, on ? "emergency_light_on" : "emergency_light_off");
+        }
+    }
+}

Content.Client/NodeContainer/NodeGroupSystem.cs

@@ -0,0 +1,99 @@
+using System.Collections.Generic;
+using System.Linq;
+using Content.Shared.NodeContainer;
+using JetBrains.Annotations;
+using Robust.Client.Graphics;
+using Robust.Client.Input;
+using Robust.Client.ResourceManagement;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Map;
+
+namespace Content.Client.NodeContainer
+{
+    [UsedImplicitly]
+    public sealed class NodeGroupSystem : EntitySystem
+    {
+        [Dependency] private readonly IOverlayManager _overlayManager = default!;
+        [Dependency] private readonly IEntityLookup _entityLookup = default!;
+        [Dependency] private readonly IMapManager _mapManager = default!;
+        [Dependency] private readonly IInputManager _inputManager = default!;
+        [Dependency] private readonly IEyeManager _eyeManager = default!;
+        [Dependency] private readonly IResourceCache _resourceCache = default!;
+
+        public bool VisEnabled { get; private set; }
+
+        public Dictionary<int, NodeVis.GroupData> Groups { get; } = new();
+        public HashSet<string> Filtered { get; } = new();
+
+        public Dictionary<EntityUid, (NodeVis.GroupData group, NodeVis.NodeDatum node)[]>
+            Entities { get; private set; } = new();
+
+        public Dictionary<(int group, int node), NodeVis.NodeDatum> NodeLookup { get; private set; } = new();
+
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            SubscribeNetworkEvent<NodeVis.MsgData>(DataMsgHandler);
+        }
+
+        public override void Shutdown()
+        {
+            base.Shutdown();
+
+            _overlayManager.RemoveOverlay<NodeVisualizationOverlay>();
+        }
+
+        private void DataMsgHandler(NodeVis.MsgData ev)
+        {
+            if (!VisEnabled)
+                return;
+
+            foreach (var deletion in ev.GroupDeletions)
+            {
+                Groups.Remove(deletion);
+            }
+
+            foreach (var group in ev.Groups)
+            {
+                Groups.Add(group.NetId, group);
+            }
+
+            Entities = Groups.Values
+                .SelectMany(g => g.Nodes, (data, nodeData) => (data, nodeData))
+                .GroupBy(n => n.nodeData.Entity)
+                .ToDictionary(g => g.Key, g => g.ToArray());
+
+            NodeLookup = Groups.Values
+                .SelectMany(g => g.Nodes, (data, nodeData) => (data, nodeData))
+                .ToDictionary(n => (n.data.NetId, n.nodeData.NetId), n => n.nodeData);
+        }
+
+        public void SetVisEnabled(bool enabled)
+        {
+            VisEnabled = enabled;
+
+            RaiseNetworkEvent(new NodeVis.MsgEnable(enabled));
+
+            if (enabled)
+            {
+                var overlay = new NodeVisualizationOverlay(
+                    this,
+                    _entityLookup,
+                    _mapManager,
+                    _inputManager,
+                    _eyeManager,
+                    _resourceCache,
+                    EntityManager);
+
+                _overlayManager.AddOverlay(overlay);
+            }
+            else
+            {
+                Groups.Clear();
+                Entities.Clear();
+            }
+        }
+    }
+}

Content.Client/NodeContainer/NodeVisCommand.cs

@@ -0,0 +1,56 @@
+using Content.Client.Administration.Managers;
+using Content.Shared.Administration;
+using Robust.Shared.Console;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+
+namespace Content.Client.NodeContainer
+{
+    public sealed class NodeVisCommand : IConsoleCommand
+    {
+        public string Command => "nodevis";
+        public string Description => "Toggles node group visualization";
+        public string Help => "";
+
+        public void Execute(IConsoleShell shell, string argStr, string[] args)
+        {
+            var adminMan = IoCManager.Resolve<IClientAdminManager>();
+            if (!adminMan.HasFlag(AdminFlags.Debug))
+            {
+                shell.WriteError("You need +DEBUG for this command");
+                return;
+            }
+
+            var sys = EntitySystem.Get<NodeGroupSystem>();
+            sys.SetVisEnabled(!sys.VisEnabled);
+        }
+    }
+
+    public sealed class NodeVisFilterCommand : IConsoleCommand
+    {
+        public string Command => "nodevisfilter";
+        public string Description => "Toggles showing a specific group on nodevis";
+        public string Help => "Usage: nodevis [filter]\nOmit filter to list currently masked-off";
+
+        public void Execute(IConsoleShell shell, string argStr, string[] args)
+        {
+            var sys = EntitySystem.Get<NodeGroupSystem>();
+
+            if (args.Length == 0)
+            {
+                foreach (var filtered in sys.Filtered)
+                {
+                    shell.WriteLine(filtered);
+                }
+            }
+            else
+            {
+                var filter = args[0];
+                if (!sys.Filtered.Add(filter))
+                {
+                    sys.Filtered.Remove(filter);
+                }
+            }
+        }
+    }
+}

Content.Client/NodeContainer/NodeVisualizationOverlay.cs

@@ -0,0 +1,232 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Content.Client.Resources;
+using Robust.Client.Graphics;
+using Robust.Client.Input;
+using Robust.Client.ResourceManagement;
+using Robust.Client.UserInterface.CustomControls;
+using Robust.Shared.Enums;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+using Robust.Shared.Timing;
+using Robust.Shared.Utility;
+using static Content.Shared.NodeContainer.NodeVis;
+
+namespace Content.Client.NodeContainer
+{
+    public sealed class NodeVisualizationOverlay : Overlay
+    {
+        private readonly NodeGroupSystem _system;
+        private readonly IEntityLookup _lookup;
+        private readonly IMapManager _mapManager;
+        private readonly IInputManager _inputManager;
+        private readonly IEyeManager _eyeManager;
+        private readonly IEntityManager _entityManager;
+
+        private readonly Dictionary<(int, int), NodeRenderData> _nodeIndex = new();
+        private readonly Dictionary<GridId, Dictionary<Vector2i, List<(GroupData, NodeDatum)>>> _gridIndex = new ();
+
+        private readonly Font _font;
+
+        private (int group, int node)? _hovered;
+        private float _time;
+
+        public override OverlaySpace Space => OverlaySpace.ScreenSpace | OverlaySpace.WorldSpace;
+
+        public NodeVisualizationOverlay(
+            NodeGroupSystem system,
+            IEntityLookup lookup,
+            IMapManager mapManager,
+            IInputManager inputManager,
+            IEyeManager eyeManager,
+            IResourceCache cache,
+            IEntityManager entityManager)
+        {
+            _system = system;
+            _lookup = lookup;
+            _mapManager = mapManager;
+            _inputManager = inputManager;
+            _eyeManager = eyeManager;
+            _entityManager = entityManager;
+
+            _font = cache.GetFont("/Fonts/NotoSans/NotoSans-Regular.ttf", 12);
+        }
+
+        protected override void Draw(in OverlayDrawArgs args)
+        {
+            if ((args.Space & OverlaySpace.WorldSpace) != 0)
+            {
+                DrawWorld(args);
+            }
+            else if ((args.Space & OverlaySpace.ScreenSpace) != 0)
+            {
+                DrawScreen(args);
+            }
+        }
+
+        private void DrawScreen(in OverlayDrawArgs args)
+        {
+            if (_hovered == null)
+                return;
+
+            var (groupId, nodeId) = _hovered.Value;
+
+            var group = _system.Groups[groupId];
+            var node = _system.NodeLookup[(groupId, nodeId)];
+
+            var mousePos = _inputManager.MouseScreenPosition.Position;
+
+            var entity = _entityManager.GetEntity(node.Entity);
+
+            var gridId = entity.Transform.GridID;
+            var grid = _mapManager.GetGrid(gridId);
+            var gridTile = grid.TileIndicesFor(entity.Transform.Coordinates);
+
+            var sb = new StringBuilder();
+            sb.Append($"entity: {entity}\n");
+            sb.Append($"group id: {group.GroupId}\n");
+            sb.Append($"node: {node.Name}\n");
+            sb.Append($"type: {node.Type}\n");
+            sb.Append($"grid pos: {gridTile}\n");
+
+            args.ScreenHandle.DrawString(_font, mousePos + (20, -20), sb.ToString());
+        }
+
+        private void DrawWorld(in OverlayDrawArgs overlayDrawArgs)
+        {
+            const float nodeSize = 8f / 32;
+            const float nodeOffset = 6f / 32;
+
+            var handle = overlayDrawArgs.WorldHandle;
+
+            var map = overlayDrawArgs.Viewport.Eye?.Position.MapId ?? default;
+            if (map == MapId.Nullspace)
+                return;
+
+            var mouseScreenPos = _inputManager.MouseScreenPosition;
+            var mouseWorldPos = _eyeManager.ScreenToMap(mouseScreenPos).Position;
+
+            _hovered = default;
+
+            var cursorBox = Box2.CenteredAround(mouseWorldPos, (nodeSize, nodeSize));
+
+            // Group visible nodes by grid tiles.
+            var worldBounds = overlayDrawArgs.WorldBounds;
+            _lookup.FastEntitiesIntersecting(map, ref worldBounds, entity =>
+            {
+                if (!_system.Entities.TryGetValue(entity.Uid, out var nodeData))
+                    return;
+
+                var gridId = entity.Transform.GridID;
+                var grid = _mapManager.GetGrid(gridId);
+                var gridDict = _gridIndex.GetOrNew(gridId);
+                var coords = entity.Transform.Coordinates;
+
+                // TODO: This probably shouldn't be capable of returning NaN...
+                if (float.IsNaN(coords.Position.X) || float.IsNaN(coords.Position.Y))
+                    return;
+
+                var tile = gridDict.GetOrNew(grid.TileIndicesFor(coords));
+
+                foreach (var (group, nodeDatum) in nodeData)
+                {
+                    if (!_system.Filtered.Contains(group.GroupId))
+                    {
+                        tile.Add((group, nodeDatum));
+                    }
+                }
+            });
+
+            foreach (var (gridId, gridDict) in _gridIndex)
+            {
+                var grid = _mapManager.GetGrid(gridId);
+                foreach (var (pos, list) in gridDict)
+                {
+                    var centerPos = grid.GridTileToWorld(pos).Position;
+                    list.Sort(NodeDisplayComparer.Instance);
+
+                    var offset = -(list.Count - 1) * nodeOffset / 2;
+
+                    foreach (var (group, node) in list)
+                    {
+                        var nodePos = centerPos + (offset, offset);
+                        if (cursorBox.Contains(nodePos))
+                            _hovered = (group.NetId, node.NetId);
+
+                        _nodeIndex[(group.NetId, node.NetId)] = new NodeRenderData(group, node, nodePos);
+                        offset += nodeOffset;
+                    }
+                }
+            }
+
+            foreach (var nodeRenderData in _nodeIndex.Values)
+            {
+                var pos = nodeRenderData.WorldPos;
+                var bounds = Box2.CenteredAround(pos, (nodeSize, nodeSize));
+
+                var groupData = nodeRenderData.GroupData;
+                var color = groupData.Color;
+
+                if (!_hovered.HasValue)
+                    color.A = 0.5f;
+                else if (_hovered.Value.group != groupData.NetId)
+                    color.A = 0.2f;
+                else
+                    color.A = 0.75f + MathF.Sin(_time * 4) * 0.25f;
+
+                handle.DrawRect(bounds, color);
+
+                foreach (var reachable in nodeRenderData.NodeDatum.Reachable)
+                {
+                    if (_nodeIndex.TryGetValue((groupData.NetId, reachable), out var reachDat))
+                    {
+                        handle.DrawLine(pos, reachDat.WorldPos, color);
+                    }
+                }
+            }
+
+            _nodeIndex.Clear();
+            _gridIndex.Clear();
+        }
+
+        protected override void FrameUpdate(FrameEventArgs args)
+        {
+            base.FrameUpdate(args);
+
+            _time += args.DeltaSeconds;
+        }
+
+        private sealed class NodeDisplayComparer : IComparer<(GroupData, NodeDatum)>
+        {
+            public static readonly NodeDisplayComparer Instance = new();
+
+            public int Compare((GroupData, NodeDatum) x, (GroupData, NodeDatum) y)
+            {
+                var (groupX, nodeX) = x;
+                var (groupY, nodeY) = y;
+
+                var cmp = groupX.NetId.CompareTo(groupY.NetId);
+                if (cmp != 0)
+                    return cmp;
+
+                return nodeX.NetId.CompareTo(nodeY.NetId);
+            }
+        }
+
+        private sealed class NodeRenderData
+        {
+            public GroupData GroupData;
+            public NodeDatum NodeDatum;
+            public Vector2 WorldPos;
+
+            public NodeRenderData(GroupData groupData, NodeDatum nodeDatum, Vector2 worldPos)
+            {
+                GroupData = groupData;
+                NodeDatum = nodeDatum;
+                WorldPos = worldPos;
+            }
+        }
+    }
+}

Content.Client/Power/APC/ApcBoundUserInterface.cs

@@ -9,7 +9,7 @@ using Robust.Client.UserInterface.CustomControls;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Maths;
 
-namespace Content.Client.APC
+namespace Content.Client.Power.APC
 {
     [UsedImplicitly]
     public class ApcBoundUserInterface : BoundUserInterface

Content.Client/Power/APC/ApcVisualizer.cs

@@ -3,7 +3,7 @@ using JetBrains.Annotations;
 using Robust.Client.GameObjects;
 using Robust.Shared.GameObjects;
 
-namespace Content.Client.APC
+namespace Content.Client.Power.APC
 {
     public class ApcVisualizer : AppearanceVisualizer
     {

Content.Client/Power/SMES/SmesVisualizer.cs

@@ -4,7 +4,7 @@ using JetBrains.Annotations;
 using Robust.Client.GameObjects;
 using Robust.Shared.GameObjects;
 
-namespace Content.Client.SMES
+namespace Content.Client.Power.SMES
 {
     [UsedImplicitly]
     public class SmesVisualizer : AppearanceVisualizer

Content.Client/Power/Visualizers/CableVisualizer.cs

@@ -0,0 +1,26 @@
+using Content.Shared.Wires;
+using Robust.Client.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Client.Power
+{
+    [DataDefinition]
+    public sealed class CableVisualizer : AppearanceVisualizer
+    {
+        [DataField("base")]
+        public string? StateBase;
+
+        public override void OnChangeData(AppearanceComponent component)
+        {
+            base.OnChangeData(component);
+
+            if (!component.Owner.TryGetComponent(out SpriteComponent? sprite))
+                return;
+
+            if (!component.TryGetData(WireVisVisuals.ConnectedMask, out WireVisDirFlags mask))
+                mask = WireVisDirFlags.None;
+
+            sprite.LayerSetState(0, $"{StateBase}{(int) mask}");
+        }
+    }
+}

Content.Client/Stack/StackVisualizer.cs

@@ -66,7 +66,7 @@ namespace Content.Client.Stack
         ///
         /// <list type="bullet">
         /// <item>
-        /// <description>false: they are opaque and mutually exclusive (e.g. sprites in a wire coil). <b>Default value</b></description>
+        /// <description>false: they are opaque and mutually exclusive (e.g. sprites in a cable coil). <b>Default value</b></description>
         /// </item>
         /// <item>
         /// <description>true: they are transparent and thus layered one over another in ascending order first</description>

Content.Client/Wires/Visualizers/WiresVisualizer.cs

@@ -1,7 +1,7 @@
 using Robust.Client.GameObjects;
 using static Content.Shared.Wires.SharedWiresComponent;
 
-namespace Content.Client.Wires
+namespace Content.Client.Wires.Visualizers
 {
     public class WiresVisualizer : AppearanceVisualizer
     {

Content.IntegrationTests/Tests/Disposal/DisposalUnitTest.cs

@@ -85,7 +85,7 @@ namespace Content.IntegrationTests.Tests.Disposal
   components:
   - type: DisposalUnit
   - type: Anchorable
-  - type: PowerReceiver
+  - type: ApcPowerReceiver
   - type: Physics
     bodyType: Static
 
@@ -155,7 +155,7 @@ namespace Content.IntegrationTests.Tests.Disposal
                 Flush(unit, false, human, wrench);
 
                 // Remove power need
-                Assert.True(disposalUnit.TryGetComponent(out PowerReceiverComponent? power));
+                Assert.True(disposalUnit.TryGetComponent(out ApcPowerReceiverComponent? power));
                 power!.NeedsPower = false;
                 Assert.True(unit.Powered);
 

Content.IntegrationTests/Tests/EntityTest.cs

@@ -2,7 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
-using Content.Server.Battery.Components;
+using Content.Server.Power.Components;
 using Content.Server.PowerCell.Components;
 using Content.Shared.CCVar;
 using Content.Shared.Coordinates;

Content.IntegrationTests/Tests/GravityGridTest.cs

@@ -22,7 +22,7 @@ namespace Content.IntegrationTests.Tests
   id: GravityGeneratorDummy
   components:
   - type: GravityGenerator
-  - type: PowerReceiver
+  - type: ApcPowerReceiver
 ";
         [Test]
         public async Task Test()
@@ -48,9 +48,9 @@ namespace Content.IntegrationTests.Tests
 
                 generator = entityMan.SpawnEntity("GravityGeneratorDummy", grid2.ToCoordinates());
                 Assert.That(generator.HasComponent<GravityGeneratorComponent>());
-                Assert.That(generator.HasComponent<PowerReceiverComponent>());
+                Assert.That(generator.HasComponent<ApcPowerReceiverComponent>());
                 var generatorComponent = generator.GetComponent<GravityGeneratorComponent>();
-                var powerComponent = generator.GetComponent<PowerReceiverComponent>();
+                var powerComponent = generator.GetComponent<ApcPowerReceiverComponent>();
                 Assert.That(generatorComponent.Status, Is.EqualTo(GravityGeneratorStatus.Unpowered));
                 powerComponent.NeedsPower = false;
             });

Content.IntegrationTests/Tests/Power/PowerTest.cs

@@ -0,0 +1,996 @@
+#nullable enable
+using System.Threading.Tasks;
+using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
+using Content.Server.Power.Components;
+using Content.Server.Power.Nodes;
+using Content.Shared.Coordinates;
+using NUnit.Framework;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+using Robust.Shared.Timing;
+
+namespace Content.IntegrationTests.Tests.Power
+{
+    [Parallelizable(ParallelScope.Fixtures)]
+    [TestFixture]
+    public class PowerTest : ContentIntegrationTest
+    {
+        private const string Prototypes = @"
+- type: entity
+  id: GeneratorDummy
+  components:
+  - type: NodeContainer
+    nodes:
+      output:
+        !type:CableDeviceNode
+        nodeGroupID: HVPower
+  - type: PowerSupplier
+  - type: Transform
+    anchored: true
+
+- type: entity
+  id: ConsumerDummy
+  components:
+  - type: Transform
+    anchored: true
+  - type: NodeContainer
+    nodes:
+      input:
+        !type:CableDeviceNode
+        nodeGroupID: HVPower
+  - type: PowerConsumer
+
+- type: entity
+  id: ChargingBatteryDummy
+  components:
+  - type: Transform
+    anchored: true
+  - type: NodeContainer
+    nodes:
+      output:
+        !type:CableDeviceNode
+        nodeGroupID: HVPower
+  - type: PowerNetworkBattery
+  - type: Battery
+  - type: BatteryCharger
+
+- type: entity
+  id: DischargingBatteryDummy
+  components:
+  - type: Transform
+    anchored: true
+  - type: NodeContainer
+    nodes:
+      output:
+        !type:CableDeviceNode
+        nodeGroupID: HVPower
+  - type: PowerNetworkBattery
+  - type: Battery
+  - type: BatteryDischarger
+
+- type: entity
+  id: FullBatteryDummy
+  components:
+  - type: Transform
+    anchored: true
+  - type: NodeContainer
+    nodes:
+      output:
+        !type:CableDeviceNode
+        nodeGroupID: HVPower
+      input:
+        !type:CableTerminalPortNode
+        nodeGroupID: HVPower
+  - type: PowerNetworkBattery
+  - type: Battery
+  - type: BatteryDischarger
+    node: output
+  - type: BatteryCharger
+    node: input
+
+- type: entity
+  id: SubstationDummy
+  components:
+  - type: NodeContainer
+    nodes:
+      input:
+        !type:CableDeviceNode
+        nodeGroupID: HVPower
+      output:
+        !type:CableDeviceNode
+        nodeGroupID: MVPower
+  - type: BatteryCharger
+    voltage: High
+  - type: BatteryDischarger
+    voltage: Medium
+  - type: PowerNetworkBattery
+    maxChargeRate: 1000
+    maxSupply: 1000
+    supplyRampTolerance: 1000
+  - type: Battery
+    maxCharge: 1000
+    startingCharge: 1000
+  - type: Transform
+    anchored: true
+
+- type: entity
+  id: ApcDummy
+  components:
+  - type: Battery
+    maxCharge: 10000
+    startingCharge: 10000
+  - type: PowerNetworkBattery
+    maxChargeRate: 1000
+    maxSupply: 1000
+    supplyRampTolerance: 1000
+  - type: BatteryCharger
+    voltage: Medium
+  - type: BatteryDischarger
+    voltage: Apc
+  - type: Apc
+    voltage: Apc
+  - type: NodeContainer
+    nodes:
+      input:
+        !type:CableDeviceNode
+        nodeGroupID: MVPower
+      output:
+        !type:CableDeviceNode
+        nodeGroupID: Apc
+  - type: Transform
+    anchored: true
+  - type: UserInterface
+    interfaces:
+    - key: enum.ApcUiKey.Key
+      type: ApcBoundUserInterface
+  - type: AccessReader
+    access: [['Engineering']]
+
+- type: entity
+  id: ApcPowerReceiverDummy
+  components:
+  - type: ApcPowerReceiver
+  - type: Transform
+    anchored: true
+";
+
+        private ServerIntegrationInstance _server = default!;
+        private IMapManager _mapManager = default!;
+        private IEntityManager _entityManager = default!;
+        private IGameTiming _gameTiming = default!;
+
+        [OneTimeSetUp]
+        public async Task Setup()
+        {
+            var options = new ServerIntegrationOptions {ExtraPrototypes = Prototypes};
+            _server = StartServerDummyTicker(options);
+
+            await _server.WaitIdleAsync();
+            _mapManager = _server.ResolveDependency<IMapManager>();
+            _entityManager = _server.ResolveDependency<IEntityManager>();
+            _gameTiming = _server.ResolveDependency<IGameTiming>();
+        }
+
+        /// <summary>
+        ///     Test small power net with a simple surplus of power over the loads.
+        /// </summary>
+        [Test]
+        public async Task TestSimpleSurplus()
+        {
+            const float loadPower = 200;
+            PowerSupplierComponent supplier = default!;
+            PowerConsumerComponent consumer1 = default!;
+            PowerConsumerComponent consumer2 = default!;
+
+            _server.Assert(() =>
+            {
+                var map = _mapManager.CreateMap();
+                var grid = _mapManager.CreateGrid(map);
+
+                // Power only works when anchored
+                for (var i = 0; i < 3; i++)
+                {
+                    grid.SetTile(new Vector2i(0, i), new Tile(1));
+                    _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, i));
+                }
+
+                var generatorEnt = _entityManager.SpawnEntity("GeneratorDummy", grid.ToCoordinates());
+                var consumerEnt1 = _entityManager.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 1));
+                var consumerEnt2 = _entityManager.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 2));
+
+                supplier = generatorEnt.GetComponent<PowerSupplierComponent>();
+                consumer1 = consumerEnt1.GetComponent<PowerConsumerComponent>();
+                consumer2 = consumerEnt2.GetComponent<PowerConsumerComponent>();
+
+                // Plenty of surplus and tolerance
+                supplier.MaxSupply = loadPower * 4;
+                supplier.SupplyRampTolerance = loadPower * 4;
+                consumer1.DrawRate = loadPower;
+                consumer2.DrawRate = loadPower;
+            });
+
+            _server.RunTicks(1); //let run a tick for PowerNet to process power
+
+            _server.Assert(() =>
+            {
+                // Assert both consumers fully powered
+                Assert.That(consumer1.ReceivedPower, Is.EqualTo(consumer1.DrawRate).Within(0.1));
+                Assert.That(consumer2.ReceivedPower, Is.EqualTo(consumer2.DrawRate).Within(0.1));
+
+                // Assert that load adds up on supply.
+                Assert.That(supplier.CurrentSupply, Is.EqualTo(loadPower * 2).Within(0.1));
+            });
+
+            await _server.WaitIdleAsync();
+        }
+
+
+        /// <summary>
+        ///     Test small power net with a simple deficit of power over the loads.
+        /// </summary>
+        [Test]
+        public async Task TestSimpleDeficit()
+        {
+            const float loadPower = 200;
+            PowerSupplierComponent supplier = default!;
+            PowerConsumerComponent consumer1 = default!;
+            PowerConsumerComponent consumer2 = default!;
+
+            _server.Assert(() =>
+            {
+                var map = _mapManager.CreateMap();
+                var grid = _mapManager.CreateGrid(map);
+
+                // Power only works when anchored
+                for (var i = 0; i < 3; i++)
+                {
+                    grid.SetTile(new Vector2i(0, i), new Tile(1));
+                    _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, i));
+                }
+
+                var generatorEnt = _entityManager.SpawnEntity("GeneratorDummy", grid.ToCoordinates());
+                var consumerEnt1 = _entityManager.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 1));
+                var consumerEnt2 = _entityManager.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 2));
+
+                supplier = generatorEnt.GetComponent<PowerSupplierComponent>();
+                consumer1 = consumerEnt1.GetComponent<PowerConsumerComponent>();
+                consumer2 = consumerEnt2.GetComponent<PowerConsumerComponent>();
+
+                // Too little supply, both consumers should get 33% power.
+                supplier.MaxSupply = loadPower;
+                supplier.SupplyRampTolerance = loadPower;
+                consumer1.DrawRate = loadPower;
+                consumer2.DrawRate = loadPower * 2;
+            });
+
+            _server.RunTicks(1); //let run a tick for PowerNet to process power
+
+            _server.Assert(() =>
+            {
+                // Assert both consumers get 33% power.
+                Assert.That(consumer1.ReceivedPower, Is.EqualTo(consumer1.DrawRate / 3).Within(0.1));
+                Assert.That(consumer2.ReceivedPower, Is.EqualTo(consumer2.DrawRate / 3).Within(0.1));
+
+                // Supply should be maxed out
+                Assert.That(supplier.CurrentSupply, Is.EqualTo(supplier.MaxSupply).Within(0.1));
+            });
+
+            await _server.WaitIdleAsync();
+        }
+
+        [Test]
+        public async Task TestSupplyRamp()
+        {
+            PowerSupplierComponent supplier = default!;
+            PowerConsumerComponent consumer = default!;
+
+            _server.Assert(() =>
+            {
+                var map = _mapManager.CreateMap();
+                var grid = _mapManager.CreateGrid(map);
+
+                // Power only works when anchored
+                for (var i = 0; i < 3; i++)
+                {
+                    grid.SetTile(new Vector2i(0, i), new Tile(1));
+                    _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, i));
+                }
+
+                var generatorEnt = _entityManager.SpawnEntity("GeneratorDummy", grid.ToCoordinates());
+                var consumerEnt = _entityManager.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 2));
+
+                supplier = generatorEnt.GetComponent<PowerSupplierComponent>();
+                consumer = consumerEnt.GetComponent<PowerConsumerComponent>();
+
+                // Supply has enough total power but needs to ramp up to match.
+                supplier.MaxSupply = 400;
+                supplier.SupplyRampRate = 400;
+                supplier.SupplyRampTolerance = 100;
+                consumer.DrawRate = 400;
+            });
+
+            // Exact values can/will be off by a tick, add tolerance for that.
+            var tickRate = (float) _gameTiming.TickPeriod.TotalSeconds;
+            var tickDev = 400 * tickRate * 1.1f;
+
+            _server.RunTicks(1);
+
+            _server.Assert(() =>
+            {
+                // First tick, supply should be delivering 100 W (max tolerance) and start ramping up.
+                Assert.That(supplier.CurrentSupply, Is.EqualTo(100).Within(0.1));
+                Assert.That(consumer.ReceivedPower, Is.EqualTo(100).Within(0.1));
+            });
+
+            _server.RunTicks(14);
+
+            _server.Assert(() =>
+            {
+                // After 15 ticks (0.25 seconds), supply ramp pos should be at 100 W and supply at 100, approx.
+                Assert.That(supplier.CurrentSupply, Is.EqualTo(200).Within(tickDev));
+                Assert.That(supplier.SupplyRampPosition, Is.EqualTo(100).Within(tickDev));
+                Assert.That(consumer.ReceivedPower, Is.EqualTo(200).Within(tickDev));
+            });
+
+            _server.RunTicks(45);
+
+            _server.Assert(() =>
+            {
+                // After 1 second total, ramp should be at 400 and supply should be at 400, everybody happy.
+                Assert.That(supplier.CurrentSupply, Is.EqualTo(400).Within(tickDev));
+                Assert.That(supplier.SupplyRampPosition, Is.EqualTo(400).Within(tickDev));
+                Assert.That(consumer.ReceivedPower, Is.EqualTo(400).Within(tickDev));
+            });
+
+            await _server.WaitIdleAsync();
+        }
+
+        [Test]
+        public async Task TestBatteryRamp()
+        {
+            const float startingCharge = 100_000;
+
+            PowerNetworkBatteryComponent netBattery = default!;
+            BatteryComponent battery = default!;
+            PowerConsumerComponent consumer = default!;
+
+            _server.Assert(() =>
+            {
+                var map = _mapManager.CreateMap();
+                var grid = _mapManager.CreateGrid(map);
+
+                // Power only works when anchored
+                for (var i = 0; i < 3; i++)
+                {
+                    grid.SetTile(new Vector2i(0, i), new Tile(1));
+                    _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, i));
+                }
+
+                var generatorEnt = _entityManager.SpawnEntity("DischargingBatteryDummy", grid.ToCoordinates());
+                var consumerEnt = _entityManager.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 2));
+
+                netBattery = generatorEnt.GetComponent<PowerNetworkBatteryComponent>();
+                battery = generatorEnt.GetComponent<BatteryComponent>();
+                consumer = consumerEnt.GetComponent<PowerConsumerComponent>();
+
+                battery.MaxCharge = startingCharge;
+                battery.CurrentCharge = startingCharge;
+                netBattery.MaxSupply = 400;
+                netBattery.SupplyRampRate = 400;
+                netBattery.SupplyRampTolerance = 100;
+                consumer.DrawRate = 400;
+            });
+
+            // Exact values can/will be off by a tick, add tolerance for that.
+            var tickRate = (float) _gameTiming.TickPeriod.TotalSeconds;
+            var tickDev = 400 * tickRate * 1.1f;
+
+            _server.RunTicks(1);
+
+            _server.Assert(() =>
+            {
+                // First tick, supply should be delivering 100 W (max tolerance) and start ramping up.
+                Assert.That(netBattery.CurrentSupply, Is.EqualTo(100).Within(0.1));
+                Assert.That(consumer.ReceivedPower, Is.EqualTo(100).Within(0.1));
+            });
+
+            _server.RunTicks(14);
+
+            _server.Assert(() =>
+            {
+                // After 15 ticks (0.25 seconds), supply ramp pos should be at 100 W and supply at 100, approx.
+                Assert.That(netBattery.CurrentSupply, Is.EqualTo(200).Within(tickDev));
+                Assert.That(netBattery.SupplyRampPosition, Is.EqualTo(100).Within(tickDev));
+                Assert.That(consumer.ReceivedPower, Is.EqualTo(200).Within(tickDev));
+
+                // Trivial integral to calculate expected power spent.
+                const double spentExpected = (200 + 100) / 2.0 * 0.25;
+                Assert.That(battery.CurrentCharge, Is.EqualTo(startingCharge - spentExpected).Within(tickDev));
+            });
+
+            _server.RunTicks(45);
+
+            _server.Assert(() =>
+            {
+                // After 1 second total, ramp should be at 400 and supply should be at 400, everybody happy.
+                Assert.That(netBattery.CurrentSupply, Is.EqualTo(400).Within(tickDev));
+                Assert.That(netBattery.SupplyRampPosition, Is.EqualTo(400).Within(tickDev));
+                Assert.That(consumer.ReceivedPower, Is.EqualTo(400).Within(tickDev));
+
+                // Trivial integral to calculate expected power spent.
+                const double spentExpected = (400 + 100) / 2.0 * 0.75 + 400 * 0.25;
+                Assert.That(battery.CurrentCharge, Is.EqualTo(startingCharge - spentExpected).Within(tickDev));
+            });
+
+            await _server.WaitIdleAsync();
+        }
+
+
+        [Test]
+        public async Task TestSimpleBatteryChargeDeficit()
+        {
+            PowerSupplierComponent supplier = default!;
+            BatteryComponent battery = default!;
+
+            _server.Assert(() =>
+            {
+                var map = _mapManager.CreateMap();
+                var grid = _mapManager.CreateGrid(map);
+
+                // Power only works when anchored
+                for (var i = 0; i < 3; i++)
+                {
+                    grid.SetTile(new Vector2i(0, i), new Tile(1));
+                    _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, i));
+                }
+
+                var generatorEnt = _entityManager.SpawnEntity("GeneratorDummy", grid.ToCoordinates());
+                var batteryEnt = _entityManager.SpawnEntity("ChargingBatteryDummy", grid.ToCoordinates(0, 2));
+
+                supplier = generatorEnt.GetComponent<PowerSupplierComponent>();
+                var netBattery = batteryEnt.GetComponent<PowerNetworkBatteryComponent>();
+                battery = batteryEnt.GetComponent<BatteryComponent>();
+
+                supplier.MaxSupply = 500;
+                supplier.SupplyRampTolerance = 500;
+                battery.MaxCharge = 100000;
+                netBattery.MaxChargeRate = 1000;
+                netBattery.Efficiency = 0.5f;
+            });
+
+            _server.RunTicks(30); // 60 TPS, 0.5 seconds
+
+            _server.Assert(() =>
+            {
+                // half a second @ 500 W = 250
+                // 50% efficiency, so 125 J stored total.
+                Assert.That(battery.CurrentCharge, Is.EqualTo(125).Within(0.1));
+                Assert.That(supplier.CurrentSupply, Is.EqualTo(500).Within(0.1));
+            });
+
+            await _server.WaitIdleAsync();
+        }
+
+        [Test]
+        public async Task TestFullBattery()
+        {
+            PowerConsumerComponent consumer = default!;
+            PowerSupplierComponent supplier = default!;
+            PowerNetworkBatteryComponent netBattery = default!;
+            BatteryComponent battery = default!;
+
+            _server.Assert(() =>
+            {
+                var map = _mapManager.CreateMap();
+                var grid = _mapManager.CreateGrid(map);
+
+                // Power only works when anchored
+                for (var i = 0; i < 4; i++)
+                {
+                    grid.SetTile(new Vector2i(0, i), new Tile(1));
+                    _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, i));
+                }
+
+                var terminal = _entityManager.SpawnEntity("CableTerminal", grid.ToCoordinates(0, 1));
+                terminal.Transform.LocalRotation = Angle.FromDegrees(180);
+
+                var batteryEnt = _entityManager.SpawnEntity("FullBatteryDummy", grid.ToCoordinates(0, 2));
+                var supplyEnt = _entityManager.SpawnEntity("GeneratorDummy", grid.ToCoordinates(0, 0));
+                var consumerEnt = _entityManager.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 3));
+
+                consumer = consumerEnt.GetComponent<PowerConsumerComponent>();
+                supplier = supplyEnt.GetComponent<PowerSupplierComponent>();
+                netBattery = batteryEnt.GetComponent<PowerNetworkBatteryComponent>();
+                battery = batteryEnt.GetComponent<BatteryComponent>();
+
+                // Consumer needs 1000 W, supplier can only provide 800, battery fills in the remaining 200.
+                consumer.DrawRate = 1000;
+                supplier.MaxSupply = 800;
+                supplier.SupplyRampTolerance = 800;
+
+                netBattery.MaxSupply = 400;
+                netBattery.SupplyRampTolerance = 400;
+                netBattery.SupplyRampRate = 100_000;
+                battery.MaxCharge = 100_000;
+                battery.CurrentCharge = 100_000;
+            });
+
+            // Run some ticks so everything is stable.
+            _server.RunTicks(60);
+
+            // Exact values can/will be off by a tick, add tolerance for that.
+            var tickRate = (float) _gameTiming.TickPeriod.TotalSeconds;
+            var tickDev = 400 * tickRate * 1.1f;
+
+            _server.Assert(() =>
+            {
+                Assert.That(consumer.ReceivedPower, Is.EqualTo(consumer.DrawRate).Within(0.1));
+                Assert.That(supplier.CurrentSupply, Is.EqualTo(supplier.MaxSupply).Within(0.1));
+
+                // Battery's current supply includes passed-through power from the supply.
+                // Assert ramp position is correct to make sure it's only supplying 200 W for real.
+                Assert.That(netBattery.CurrentSupply, Is.EqualTo(1000).Within(0.1));
+                Assert.That(netBattery.SupplyRampPosition, Is.EqualTo(200).Within(0.1));
+
+                const int expectedSpent = 200;
+                Assert.That(battery.CurrentCharge, Is.EqualTo(battery.MaxCharge - expectedSpent).Within(tickDev));
+            });
+
+            await _server.WaitIdleAsync();
+        }
+
+        [Test]
+        public async Task TestFullBatteryEfficiencyPassThrough()
+        {
+            PowerConsumerComponent consumer = default!;
+            PowerSupplierComponent supplier = default!;
+            PowerNetworkBatteryComponent netBattery = default!;
+            BatteryComponent battery = default!;
+
+            _server.Assert(() =>
+            {
+                var map = _mapManager.CreateMap();
+                var grid = _mapManager.CreateGrid(map);
+
+                // Power only works when anchored
+                for (var i = 0; i < 4; i++)
+                {
+                    grid.SetTile(new Vector2i(0, i), new Tile(1));
+                    _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, i));
+                }
+
+                var terminal = _entityManager.SpawnEntity("CableTerminal", grid.ToCoordinates(0, 1));
+                terminal.Transform.LocalRotation = Angle.FromDegrees(180);
+
+                var batteryEnt = _entityManager.SpawnEntity("FullBatteryDummy", grid.ToCoordinates(0, 2));
+                var supplyEnt = _entityManager.SpawnEntity("GeneratorDummy", grid.ToCoordinates(0, 0));
+                var consumerEnt = _entityManager.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 3));
+
+                consumer = consumerEnt.GetComponent<PowerConsumerComponent>();
+                supplier = supplyEnt.GetComponent<PowerSupplierComponent>();
+                netBattery = batteryEnt.GetComponent<PowerNetworkBatteryComponent>();
+                battery = batteryEnt.GetComponent<BatteryComponent>();
+
+                // Consumer needs 1000 W, supply and battery can only provide 400 each.
+                // BUT the battery has 50% input efficiency, so 50% of the power of the supply gets lost.
+                consumer.DrawRate = 1000;
+                supplier.MaxSupply = 400;
+                supplier.SupplyRampTolerance = 400;
+
+                netBattery.MaxSupply = 400;
+                netBattery.SupplyRampTolerance = 400;
+                netBattery.SupplyRampRate = 100_000;
+                netBattery.Efficiency = 0.5f;
+                battery.MaxCharge = 1_000_000;
+                battery.CurrentCharge = 1_000_000;
+            });
+
+            // Run some ticks so everything is stable.
+            _server.RunTicks(60);
+
+            // Exact values can/will be off by a tick, add tolerance for that.
+            var tickRate = (float) _gameTiming.TickPeriod.TotalSeconds;
+            var tickDev = 400 * tickRate * 1.1f;
+
+            _server.Assert(() =>
+            {
+                Assert.That(consumer.ReceivedPower, Is.EqualTo(600).Within(0.1));
+                Assert.That(supplier.CurrentSupply, Is.EqualTo(supplier.MaxSupply).Within(0.1));
+
+                Assert.That(netBattery.CurrentSupply, Is.EqualTo(600).Within(0.1));
+                Assert.That(netBattery.SupplyRampPosition, Is.EqualTo(400).Within(0.1));
+
+                const int expectedSpent = 400;
+                Assert.That(battery.CurrentCharge, Is.EqualTo(battery.MaxCharge - expectedSpent).Within(tickDev));
+            });
+
+            await _server.WaitIdleAsync();
+        }
+
+        [Test]
+        public async Task TestFullBatteryEfficiencyDemandPassThrough()
+        {
+            PowerConsumerComponent consumer1 = default!;
+            PowerConsumerComponent consumer2 = default!;
+            PowerSupplierComponent supplier = default!;
+
+            _server.Assert(() =>
+            {
+                var map = _mapManager.CreateMap();
+                var grid = _mapManager.CreateGrid(map);
+
+                // Map layout here is
+                // C - consumer
+                // B - battery
+                // G - generator
+                // B - battery
+                // C - consumer
+                // Connected in the only way that makes sense.
+
+                // Power only works when anchored
+                for (var i = 0; i < 5; i++)
+                {
+                    grid.SetTile(new Vector2i(0, i), new Tile(1));
+                    _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, i));
+                }
+
+                _entityManager.SpawnEntity("CableTerminal", grid.ToCoordinates(0, 2));
+                var terminal = _entityManager.SpawnEntity("CableTerminal", grid.ToCoordinates(0, 2));
+                terminal.Transform.LocalRotation = Angle.FromDegrees(180);
+
+                var batteryEnt1 = _entityManager.SpawnEntity("FullBatteryDummy", grid.ToCoordinates(0, 1));
+                var batteryEnt2 = _entityManager.SpawnEntity("FullBatteryDummy", grid.ToCoordinates(0, 3));
+                var supplyEnt = _entityManager.SpawnEntity("GeneratorDummy", grid.ToCoordinates(0, 2));
+                var consumerEnt1 = _entityManager.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 0));
+                var consumerEnt2 = _entityManager.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 4));
+
+                consumer1 = consumerEnt1.GetComponent<PowerConsumerComponent>();
+                consumer2 = consumerEnt2.GetComponent<PowerConsumerComponent>();
+                supplier = supplyEnt.GetComponent<PowerSupplierComponent>();
+                var netBattery1 = batteryEnt1.GetComponent<PowerNetworkBatteryComponent>();
+                var netBattery2 = batteryEnt2.GetComponent<PowerNetworkBatteryComponent>();
+                var battery1 = batteryEnt1.GetComponent<BatteryComponent>();
+                var battery2 = batteryEnt2.GetComponent<BatteryComponent>();
+
+                // There are two loads, 500 W and 1000 W respectively.
+                // The 500 W load is behind a 50% efficient battery,
+                // so *effectively* it needs 2x as much power from the supply to run.
+                // Assert that both are getting 50% power.
+                // Batteries are empty and only a bridge.
+
+                consumer1.DrawRate = 500;
+                consumer2.DrawRate = 1000;
+                supplier.MaxSupply = 1000;
+                supplier.SupplyRampTolerance = 1000;
+
+                battery1.MaxCharge = 1_000_000;
+                battery2.MaxCharge = 1_000_000;
+
+                netBattery1.MaxChargeRate = 1_000;
+                netBattery2.MaxChargeRate = 1_000;
+
+                netBattery1.Efficiency = 0.5f;
+
+                netBattery1.MaxSupply = 1_000_000;
+                netBattery2.MaxSupply = 1_000_000;
+
+                netBattery1.SupplyRampTolerance = 1_000_000;
+                netBattery2.SupplyRampTolerance = 1_000_000;
+            });
+
+            // Run some ticks so everything is stable.
+            _server.RunTicks(10);
+
+            _server.Assert(() =>
+            {
+                Assert.That(consumer1.ReceivedPower, Is.EqualTo(250).Within(0.1));
+                Assert.That(consumer2.ReceivedPower, Is.EqualTo(500).Within(0.1));
+                Assert.That(supplier.CurrentSupply, Is.EqualTo(supplier.MaxSupply).Within(0.1));
+            });
+
+            await _server.WaitIdleAsync();
+        }
+
+        /// <summary>
+        ///     Test that power is distributed proportionally, even through batteries.
+        /// </summary>
+        [Test]
+        public async Task TestBatteriesProportional()
+        {
+            PowerConsumerComponent consumer1 = default!;
+            PowerConsumerComponent consumer2 = default!;
+            PowerSupplierComponent supplier = default!;
+
+            _server.Assert(() =>
+            {
+                var map = _mapManager.CreateMap();
+                var grid = _mapManager.CreateGrid(map);
+
+                // Map layout here is
+                // C - consumer
+                // B - battery
+                // G - generator
+                // B - battery
+                // C - consumer
+                // Connected in the only way that makes sense.
+
+                // Power only works when anchored
+                for (var i = 0; i < 5; i++)
+                {
+                    grid.SetTile(new Vector2i(0, i), new Tile(1));
+                    _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, i));
+                }
+
+                _entityManager.SpawnEntity("CableTerminal", grid.ToCoordinates(0, 2));
+                var terminal = _entityManager.SpawnEntity("CableTerminal", grid.ToCoordinates(0, 2));
+                terminal.Transform.LocalRotation = Angle.FromDegrees(180);
+
+                var batteryEnt1 = _entityManager.SpawnEntity("FullBatteryDummy", grid.ToCoordinates(0, 1));
+                var batteryEnt2 = _entityManager.SpawnEntity("FullBatteryDummy", grid.ToCoordinates(0, 3));
+                var supplyEnt = _entityManager.SpawnEntity("GeneratorDummy", grid.ToCoordinates(0, 2));
+                var consumerEnt1 = _entityManager.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 0));
+                var consumerEnt2 = _entityManager.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 4));
+
+                consumer1 = consumerEnt1.GetComponent<PowerConsumerComponent>();
+                consumer2 = consumerEnt2.GetComponent<PowerConsumerComponent>();
+                supplier = supplyEnt.GetComponent<PowerSupplierComponent>();
+                var netBattery1 = batteryEnt1.GetComponent<PowerNetworkBatteryComponent>();
+                var netBattery2 = batteryEnt2.GetComponent<PowerNetworkBatteryComponent>();
+                var battery1 = batteryEnt1.GetComponent<BatteryComponent>();
+                var battery2 = batteryEnt2.GetComponent<BatteryComponent>();
+
+                consumer1.DrawRate = 500;
+                consumer2.DrawRate = 1000;
+                supplier.MaxSupply = 1000;
+                supplier.SupplyRampTolerance = 1000;
+
+                battery1.MaxCharge = 1_000_000;
+                battery2.MaxCharge = 1_000_000;
+
+                netBattery1.MaxChargeRate = 20;
+                netBattery2.MaxChargeRate = 20;
+
+                netBattery1.MaxSupply = 1_000_000;
+                netBattery2.MaxSupply = 1_000_000;
+
+                netBattery1.SupplyRampTolerance = 1_000_000;
+                netBattery2.SupplyRampTolerance = 1_000_000;
+            });
+
+            // Run some ticks so everything is stable.
+            _server.RunTicks(60);
+
+            _server.Assert(() =>
+            {
+                // NOTE: MaxChargeRate on batteries actually skews the demand.
+                // So that's why the tolerance is so high, the charge rate is so *low*,
+                // and we run so many ticks to stabilize.
+                Assert.That(consumer1.ReceivedPower, Is.EqualTo(333.333).Within(10));
+                Assert.That(consumer2.ReceivedPower, Is.EqualTo(666.666).Within(10));
+                Assert.That(supplier.CurrentSupply, Is.EqualTo(supplier.MaxSupply).Within(0.1));
+            });
+
+            await _server.WaitIdleAsync();
+        }
+
+        [Test]
+        public async Task TestBatteryEngineCut()
+        {
+            PowerConsumerComponent consumer = default!;
+            PowerSupplierComponent supplier = default!;
+            PowerNetworkBatteryComponent netBattery = default!;
+
+            _server.Post(() =>
+            {
+                var map = _mapManager.CreateMap();
+                var grid = _mapManager.CreateGrid(map);
+
+                // Power only works when anchored
+                for (var i = 0; i < 4; i++)
+                {
+                    grid.SetTile(new Vector2i(0, i), new Tile(1));
+                    _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, i));
+                }
+
+                var terminal = _entityManager.SpawnEntity("CableTerminal", grid.ToCoordinates(0, 1));
+                terminal.Transform.LocalRotation = Angle.FromDegrees(180);
+
+                var batteryEnt = _entityManager.SpawnEntity("FullBatteryDummy", grid.ToCoordinates(0, 2));
+                var supplyEnt = _entityManager.SpawnEntity("GeneratorDummy", grid.ToCoordinates(0, 0));
+                var consumerEnt = _entityManager.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 3));
+
+                consumer = consumerEnt.GetComponent<PowerConsumerComponent>();
+                supplier = supplyEnt.GetComponent<PowerSupplierComponent>();
+                netBattery = batteryEnt.GetComponent<PowerNetworkBatteryComponent>();
+                var battery = batteryEnt.GetComponent<BatteryComponent>();
+
+                // Consumer needs 1000 W, supplier can only provide 800, battery fills in the remaining 200.
+                consumer.DrawRate = 1000;
+                supplier.MaxSupply = 1000;
+                supplier.SupplyRampTolerance = 1000;
+
+                netBattery.MaxSupply = 1000;
+                netBattery.SupplyRampTolerance = 200;
+                netBattery.SupplyRampRate = 10;
+                battery.MaxCharge = 100_000;
+                battery.CurrentCharge = 100_000;
+            });
+
+            // Run some ticks so everything is stable.
+            _server.RunTicks(5);
+
+            _server.Assert(() =>
+            {
+                // Supply and consumer are fully loaded/supplied.
+                Assert.That(consumer.ReceivedPower, Is.EqualTo(consumer.DrawRate).Within(0.5));
+                Assert.That(supplier.CurrentSupply, Is.EqualTo(supplier.MaxSupply).Within(0.5));
+
+                // Cut off the supplier
+                supplier.Enabled = false;
+                // Remove tolerance on battery too.
+                netBattery.SupplyRampTolerance = 5;
+            });
+
+            _server.RunTicks(3);
+
+            _server.Assert(() =>
+            {
+                // Assert that network drops to 0 power and starts ramping up
+                Assert.That(consumer.ReceivedPower, Is.LessThan(50).And.GreaterThan(0));
+                Assert.That(netBattery.CurrentReceiving, Is.EqualTo(0));
+                Assert.That(netBattery.CurrentSupply, Is.GreaterThan(0));
+            });
+
+            await _server.WaitIdleAsync();
+        }
+
+        /// <summary>
+        ///     Test that <see cref="CableTerminalNode"/> correctly isolates two networks.
+        /// </summary>
+        [Test]
+        public async Task TestTerminalNodeGroups()
+        {
+            CableNode leftNode = default!;
+            CableNode rightNode = default!;
+            Node batteryInput = default!;
+            Node batteryOutput = default!;
+
+            _server.Assert(() =>
+            {
+                var map = _mapManager.CreateMap();
+                var grid = _mapManager.CreateGrid(map);
+
+                // Power only works when anchored
+                for (var i = 0; i < 4; i++)
+                {
+                    grid.SetTile(new Vector2i(0, i), new Tile(1));
+                }
+
+                var leftEnt = _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, 0));
+                _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, 1));
+                _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, 2));
+                var rightEnt = _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, 3));
+
+                var terminal = _entityManager.SpawnEntity("CableTerminal", grid.ToCoordinates(0, 1));
+                terminal.Transform.LocalRotation = Angle.FromDegrees(180);
+
+                var battery = _entityManager.SpawnEntity("FullBatteryDummy", grid.ToCoordinates(0, 2));
+                var batteryNodeContainer = battery.GetComponent<NodeContainerComponent>();
+
+                leftNode = leftEnt.GetComponent<NodeContainerComponent>().GetNode<CableNode>("power");
+                rightNode = rightEnt.GetComponent<NodeContainerComponent>().GetNode<CableNode>("power");
+
+                batteryInput = batteryNodeContainer.GetNode<Node>("input");
+                batteryOutput = batteryNodeContainer.GetNode<Node>("output");
+            });
+
+            // Run ticks to allow node groups to update.
+            _server.RunTicks(1);
+
+            _server.Assert(() =>
+            {
+                Assert.That(batteryInput.NodeGroup, Is.EqualTo(leftNode.NodeGroup));
+                Assert.That(batteryOutput.NodeGroup, Is.EqualTo(rightNode.NodeGroup));
+
+                Assert.That(leftNode.NodeGroup, Is.Not.EqualTo(rightNode.NodeGroup));
+            });
+
+            await _server.WaitIdleAsync();
+        }
+
+        [Test]
+        public async Task ApcChargingTest()
+        {
+            PowerNetworkBatteryComponent substationNetBattery = default!;
+            BatteryComponent apcBattery = default!;
+
+            _server.Assert(() =>
+            {
+                var map = _mapManager.CreateMap();
+                var grid = _mapManager.CreateGrid(map);
+
+                // Power only works when anchored
+                for (var i = 0; i < 3; i++)
+                {
+                    grid.SetTile(new Vector2i(0, i), new Tile(1));
+                }
+
+                _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, 0));
+                _entityManager.SpawnEntity("CableHV", grid.ToCoordinates(0, 1));
+                _entityManager.SpawnEntity("CableMV", grid.ToCoordinates(0, 1));
+                _entityManager.SpawnEntity("CableMV", grid.ToCoordinates(0, 2));
+
+                var generatorEnt = _entityManager.SpawnEntity("GeneratorDummy", grid.ToCoordinates(0, 0));
+                var substationEnt = _entityManager.SpawnEntity("SubstationDummy", grid.ToCoordinates(0, 1));
+                var apcEnt = _entityManager.SpawnEntity("ApcDummy", grid.ToCoordinates(0, 2));
+
+                var generatorSupplier = generatorEnt.GetComponent<PowerSupplierComponent>();
+                substationNetBattery = substationEnt.GetComponent<PowerNetworkBatteryComponent>();
+                apcBattery = apcEnt.GetComponent<BatteryComponent>();
+
+                generatorSupplier.MaxSupply = 1000;
+                generatorSupplier.SupplyRampTolerance = 1000;
+
+                apcBattery.CurrentCharge = 0;
+            });
+
+            _server.RunTicks(5); //let run a few ticks for PowerNets to reevaluate and start charging apc
+
+            _server.Assert(() =>
+            {
+                Assert.That(substationNetBattery.CurrentSupply, Is.GreaterThan(0)); //substation should be providing power
+                Assert.That(apcBattery.CurrentCharge, Is.GreaterThan(0)); //apc battery should have gained charge
+            });
+
+            await _server.WaitIdleAsync();
+        }
+
+        [Test]
+        public async Task ApcNetTest()
+        {
+            PowerNetworkBatteryComponent apcNetBattery = default!;
+            ApcPowerReceiverComponent receiver = default!;
+
+            _server.Assert(() =>
+            {
+                var map = _mapManager.CreateMap();
+                var grid = _mapManager.CreateGrid(map);
+
+                // Power only works when anchored
+                for (var i = 0; i < 3; i++)
+                {
+                    grid.SetTile(new Vector2i(0, i), new Tile(1));
+                }
+
+                var apcEnt = _entityManager.SpawnEntity("ApcDummy", grid.ToCoordinates(0, 0));
+                var apcExtensionEnt = _entityManager.SpawnEntity("CableApcExtension", grid.ToCoordinates(0, 0));
+                var powerReceiverEnt = _entityManager.SpawnEntity("ApcPowerReceiverDummy", grid.ToCoordinates(0, 2));
+
+                var provider = apcExtensionEnt.GetComponent<ApcPowerProviderComponent>();
+                receiver = powerReceiverEnt.GetComponent<ApcPowerReceiverComponent>();
+                var battery = apcEnt.GetComponent<BatteryComponent>();
+                apcNetBattery = apcEnt.GetComponent<PowerNetworkBatteryComponent>();
+
+                provider.PowerTransferRange = 5; //arbitrary range to reach receiver
+                receiver.PowerReceptionRange = 5; //arbitrary range to reach provider
+
+                battery.MaxCharge = 10000; //arbitrary nonzero amount of charge
+                battery.CurrentCharge = battery.MaxCharge; //fill battery
+
+                receiver.Load = 1; //arbitrary small amount of power
+            });
+
+            _server.RunTicks(1); //let run a tick for ApcNet to process power
+
+            _server.Assert(() =>
+            {
+                Assert.That(receiver.Powered);
+                Assert.That(apcNetBattery.CurrentSupply, Is.EqualTo(1).Within(0.1));
+            });
+
+            await _server.WaitIdleAsync();
+        }
+    }
+}

Content.IntegrationTests/Tests/PowerTest.cs

@@ -1,292 +0,0 @@
-#nullable enable
-using System.Threading.Tasks;
-using Content.Server.APC.Components;
-using Content.Server.Battery.Components;
-using Content.Server.GameObjects.Components;
-using Content.Server.Power.Components;
-using Content.Shared.Coordinates;
-using NUnit.Framework;
-using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
-using Robust.Shared.Map;
-using Robust.Shared.Maths;
-using Robust.Shared.Physics;
-
-namespace Content.IntegrationTests.Tests
-{
-    [TestFixture]
-    public class PowerTest : ContentIntegrationTest
-    {
-        private const string Prototypes = @"
-- type: entity
-  name: GeneratorDummy
-  id: GeneratorDummy
-  components:
-  - type: NodeContainer
-    nodes:
-      output:
-        !type:AdjacentNode
-        nodeGroupID: HVPower
-  - type: PowerSupplier
-    supplyRate: 3000
-  - type: Anchorable
-  - type: Transform
-    anchored: true
-
-- type: entity
-  name: ConsumerDummy
-  id: ConsumerDummy
-  components:
-  - type: Transform
-    anchored: true
-  - type: NodeContainer
-    nodes:
-      input:
-        !type:AdjacentNode
-        nodeGroupID: HVPower
-  - type: PowerConsumer
-    drawRate: 50
-
-- type: entity
-  name: SubstationDummy
-  id: SubstationDummy
-  components:
-  - type: Battery
-    maxCharge: 1000
-    startingCharge: 1000
-  - type: NodeContainer
-    nodes:
-      input:
-        !type:AdjacentNode
-        nodeGroupID: HVPower
-      output:
-        !type:AdjacentNode
-        nodeGroupID: MVPower
-  - type: PowerConsumer
-  - type: BatteryStorage
-    activeDrawRate: 1500
-  - type: PowerSupplier
-    voltage: Medium
-  - type: BatteryDischarger
-    activeSupplyRate: 1000
-  - type: Transform
-    anchored: true
-
-- type: entity
-  name: ApcDummy
-  id: ApcDummy
-  components:
-  - type: Battery
-    maxCharge: 10000
-    startingCharge: 10000
-  - type: BatteryStorage
-    activeDrawRate: 1000
-  - type: PowerProvider
-    voltage: Apc
-  - type: Apc
-    voltage: Apc
-  - type: PowerConsumer
-    voltage: Medium
-  - type: NodeContainer
-    nodes:
-      input:
-        !type:AdjacentNode
-        nodeGroupID: MVPower
-      output:
-        !type:AdjacentNode
-        nodeGroupID: Apc
-  - type: Transform
-    anchored: true
-  - type: UserInterface
-    interfaces:
-    - key: enum.ApcUiKey.Key
-      type: ApcBoundUserInterface
-  - type: AccessReader
-    access: [['Engineering']]
-
-- type: entity
-  name: ApcExtensionCableDummy
-  id: ApcExtensionCableDummy
-  components:
-  - type: NodeContainer
-    nodes:
-      apc:
-        !type:AdjacentNode
-        nodeGroupID: Apc
-      wire:
-        !type:AdjacentNode
-        nodeGroupID: WireNet
-  - type: PowerProvider
-    voltage: Apc
-  - type: Wire
-    wireType: Apc
-  - type: Transform
-    anchored: true
-
-- type: entity
-  name: PowerReceiverDummy
-  id: PowerReceiverDummy
-  components:
-  - type: PowerReceiver
-  - type: Transform
-    anchored: true
-";
-        [Test]
-        public async Task PowerNetTest()
-        {
-            var options = new ServerIntegrationOptions{ExtraPrototypes = Prototypes};
-            var server = StartServerDummyTicker(options);
-
-            PowerSupplierComponent supplier = default!;
-            PowerConsumerComponent consumer1 = default!;
-            PowerConsumerComponent consumer2 = default!;
-
-            server.Assert(() =>
-            {
-                var mapMan = IoCManager.Resolve<IMapManager>();
-                var entityMan = IoCManager.Resolve<IEntityManager>();
-                mapMan.CreateMap(new MapId(1));
-                var grid = mapMan.CreateGrid(new MapId(1));
-
-                // Power only works when anchored
-                grid.SetTile(new Vector2i(0, 0), new Tile(1));
-                grid.SetTile(new Vector2i(0, 1), new Tile(1));
-                grid.SetTile(new Vector2i(0, 2), new Tile(1));
-
-                var generatorEnt = entityMan.SpawnEntity("GeneratorDummy", grid.ToCoordinates());
-                var consumerEnt1 = entityMan.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 1));
-                var consumerEnt2 = entityMan.SpawnEntity("ConsumerDummy", grid.ToCoordinates(0, 2));
-
-                if (generatorEnt.TryGetComponent(out PhysicsComponent? physics))
-                {
-                    physics.BodyType = BodyType.Static;
-                }
-
-                supplier = generatorEnt.GetComponent<PowerSupplierComponent>();
-                consumer1 = consumerEnt1.GetComponent<PowerConsumerComponent>();
-                consumer2 = consumerEnt2.GetComponent<PowerConsumerComponent>();
-
-                var supplyRate = 1000; //arbitrary amount of power supply
-
-                supplier.SupplyRate = supplyRate;
-                consumer1.DrawRate = supplyRate / 2; //arbitrary draw less than supply
-                consumer2.DrawRate = supplyRate * 2; //arbitrary draw greater than supply
-
-                consumer1.Priority = Priority.First; //power goes to this consumer first
-                consumer2.Priority = Priority.Last; //any excess power should go to low priority consumer
-            });
-
-            server.RunTicks(1); //let run a tick for PowerNet to process power
-
-            server.Assert(() =>
-            {
-                Assert.That(consumer1.DrawRate, Is.EqualTo(consumer1.ReceivedPower)); //first should be fully powered
-                Assert.That(consumer2.ReceivedPower, Is.EqualTo(supplier.SupplyRate - consumer1.ReceivedPower)); //second should get remaining power
-            });
-
-            await server.WaitIdleAsync();
-        }
-
-        [Test]
-        public async Task ApcChargingTest()
-        {
-            var options = new ServerIntegrationOptions{ExtraPrototypes = Prototypes};
-            var server = StartServerDummyTicker(options);
-
-            BatteryComponent apcBattery = default!;
-            PowerSupplierComponent substationSupplier = default!;
-
-            server.Assert(() =>
-            {
-                var mapMan = IoCManager.Resolve<IMapManager>();
-                var entityMan = IoCManager.Resolve<IEntityManager>();
-                mapMan.CreateMap(new MapId(1));
-                var grid = mapMan.CreateGrid(new MapId(1));
-
-                // Power only works when anchored
-                grid.SetTile(new Vector2i(0, 0), new Tile(1));
-                grid.SetTile(new Vector2i(0, 1), new Tile(1));
-                grid.SetTile(new Vector2i(0, 2), new Tile(1));
-
-                var generatorEnt = entityMan.SpawnEntity("GeneratorDummy", grid.ToCoordinates());
-                var substationEnt = entityMan.SpawnEntity("SubstationDummy", grid.ToCoordinates(0, 1));
-                var apcEnt = entityMan.SpawnEntity("ApcDummy", grid.ToCoordinates(0, 2));
-
-                var generatorSupplier = generatorEnt.GetComponent<PowerSupplierComponent>();
-
-                substationSupplier = substationEnt.GetComponent<PowerSupplierComponent>();
-                var substationStorage = substationEnt.GetComponent<BatteryStorageComponent>();
-                var substationDischarger = substationEnt.GetComponent<BatteryDischargerComponent>();
-
-                apcBattery = apcEnt.GetComponent<BatteryComponent>();
-                var apcStorage = apcEnt.GetComponent<BatteryStorageComponent>();
-
-                generatorSupplier.SupplyRate = 1000; //arbitrary nonzero amount of power
-                substationStorage.ActiveDrawRate = 1000; //arbitrary nonzero power draw
-                substationDischarger.ActiveSupplyRate = 500; //arbitirary nonzero power supply less than substation storage draw
-                apcStorage.ActiveDrawRate = 500; //arbitrary nonzero power draw
-                apcBattery.MaxCharge = 100; //abbitrary nonzero amount of charge
-                apcBattery.CurrentCharge = 0; //no charge
-            });
-
-            server.RunTicks(5); //let run a few ticks for PowerNets to reevaluate and start charging apc
-
-            server.Assert(() =>
-            {
-                Assert.That(substationSupplier.SupplyRate, Is.Not.EqualTo(0)); //substation should be providing power
-                Assert.That(apcBattery.CurrentCharge, Is.Not.EqualTo(0)); //apc battery should have gained charge
-            });
-
-            await server.WaitIdleAsync();
-        }
-
-        [Test]
-        public async Task ApcNetTest()
-        {
-            var options = new ServerIntegrationOptions{ExtraPrototypes = Prototypes};
-            var server = StartServerDummyTicker(options);
-
-            PowerReceiverComponent receiver = default!;
-
-            server.Assert(() =>
-            {
-                var mapMan = IoCManager.Resolve<IMapManager>();
-                var entityMan = IoCManager.Resolve<IEntityManager>();
-                var mapId = new MapId(1);
-                mapMan.CreateMap(mapId);
-                var grid = mapMan.CreateGrid(mapId);
-
-                // Power only works when anchored
-                grid.SetTile(new Vector2i(0, 0), new Tile(1));
-                grid.SetTile(new Vector2i(0, 1), new Tile(1));
-                grid.SetTile(new Vector2i(0, 2), new Tile(1));
-
-                var apcEnt = entityMan.SpawnEntity("ApcDummy", grid.ToCoordinates(0, 0));
-                var apcExtensionEnt = entityMan.SpawnEntity("ApcExtensionCableDummy", grid.ToCoordinates(0, 1));
-                var powerReceiverEnt = entityMan.SpawnEntity("PowerReceiverDummy", grid.ToCoordinates(0, 2));
-
-                var apc = apcEnt.GetComponent<ApcComponent>();
-                var provider = apcExtensionEnt.GetComponent<PowerProviderComponent>();
-                receiver = powerReceiverEnt.GetComponent<PowerReceiverComponent>();
-                var battery = apcEnt.GetComponent<BatteryComponent>();
-
-                provider.PowerTransferRange = 5; //arbitrary range to reach receiver
-                receiver.PowerReceptionRange = 5; //arbitrary range to reach provider
-
-                battery.MaxCharge = 10000; //arbitrary nonzero amount of charge
-                battery.CurrentCharge = battery.MaxCharge; //fill battery
-
-                receiver.Load = 1; //arbitrary small amount of power
-            });
-
-            server.RunTicks(1); //let run a tick for ApcNet to process power
-
-            server.Assert(() =>
-            {
-                Assert.That(receiver.Powered);
-            });
-
-            await server.WaitIdleAsync();
-        }
-    }
-}

Content.IntegrationTests/Tests/SaveLoadSaveTest.cs

@@ -122,7 +122,24 @@ namespace Content.IntegrationTests.Tests
                 two = reader.ReadToEnd();
             }
 
-            Assert.That(one, Is.EqualTo(two));
+            Assert.Multiple(() => {
+                Assert.That(two, Is.EqualTo(one));
+                var failed = TestContext.CurrentContext.Result.Assertions.FirstOrDefault();
+                if (failed != null)
+                {
+                    var oneTmp = Path.GetTempFileName();
+                    var twoTmp = Path.GetTempFileName();
+
+                    File.WriteAllText(oneTmp, one);
+                    File.WriteAllText(twoTmp, two);
+
+                    TestContext.AddTestAttachment(oneTmp, "First save file");
+                    TestContext.AddTestAttachment(twoTmp, "Second save file");
+                    TestContext.Error.WriteLine("Complete output:");
+                    TestContext.Error.WriteLine(oneTmp);
+                    TestContext.Error.WriteLine(twoTmp);
+                }
+            });
         }
     }
 }

Content.Server/AME/AMENodeGroup.cs

@@ -8,6 +8,7 @@ using Content.Server.NodeContainer.NodeGroups;
 using Content.Server.NodeContainer.Nodes;
 using Robust.Shared.IoC;
 using Robust.Shared.Map;
+using Robust.Shared.Maths;
 using Robust.Shared.Random;
 using Robust.Shared.ViewVariables;
 
@@ -36,19 +37,23 @@ namespace Content.Server.AME
 
         public int CoreCount => _cores.Count;
 
-        protected override void OnAddNode(Node node)
+        public override void LoadNodes(List<Node> groupNodes)
         {
-            base.OnAddNode(node);
-            if (_masterController == null)
+            base.LoadNodes(groupNodes);
+
+            foreach (var node in groupNodes)
             {
-                node.Owner.TryGetComponent<AMEControllerComponent>(out var controller);
-                _masterController = controller;
+                if (node.Owner.TryGetComponent(out AMEControllerComponent? controller))
+                {
+                    _masterController = controller;
+                }
             }
         }
 
-        protected override void OnRemoveNode(Node node)
+        public override void RemoveNode(Node node)
         {
-            base.OnRemoveNode(node);
+            base.RemoveNode(node);
+
             RefreshAMENodes(_masterController);
             if (_masterController != null && _masterController?.Owner == node.Owner) { _masterController = null; }
         }

Content.Server/AME/Components/AMEControllerComponent.cs

@@ -33,7 +33,7 @@ namespace Content.Server.AME.Components
         private AppearanceComponent? _appearance;
         private PowerSupplierComponent? _powerSupplier;
 
-        private bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        private bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
 
         [ViewVariables]
         private int _stability = 100;
@@ -92,7 +92,7 @@ namespace Content.Server.AME.Components
             if(fuelJar != null && _powerSupplier != null)
             {
                 var availableInject = fuelJar.FuelAmount >= InjectionAmount ? InjectionAmount : fuelJar.FuelAmount;
-                _powerSupplier.SupplyRate = group.InjectFuel(availableInject, out var overloading);
+                _powerSupplier.MaxSupply = group.InjectFuel(availableInject, out var overloading);
                 fuelJar.FuelAmount -= availableInject;
                 InjectSound(overloading);
                 UpdateUserInterface();
@@ -252,7 +252,7 @@ namespace Content.Server.AME.Components
                 _appearance?.SetData(AMEControllerVisuals.DisplayState, "off");
                 if (_powerSupplier != null)
                 {
-                    _powerSupplier.SupplyRate = 0;
+                    _powerSupplier.MaxSupply = 0;
                 }
             }
             _injecting = !_injecting;

Content.Server/APC/ApcNetNodeGroup.cs

@@ -1,223 +0,0 @@
-#nullable enable
-using System.Collections.Generic;
-using System.Linq;
-using Content.Server.APC.Components;
-using Content.Server.Battery.Components;
-using Content.Server.NodeContainer.NodeGroups;
-using Content.Server.NodeContainer.Nodes;
-using Content.Server.Power.Components;
-using Robust.Shared.GameObjects;
-using Robust.Shared.Map;
-using Robust.Shared.Utility;
-using Robust.Shared.ViewVariables;
-
-namespace Content.Server.APC
-{
-    public interface IApcNet
-    {
-        bool Powered { get; }
-
-        void AddApc(ApcComponent apc);
-
-        void RemoveApc(ApcComponent apc);
-
-        void AddPowerProvider(PowerProviderComponent provider);
-
-        void RemovePowerProvider(PowerProviderComponent provider);
-
-        void UpdatePowerProviderReceivers(PowerProviderComponent provider, int oldLoad, int newLoad);
-
-        void Update(float frameTime);
-
-        GridId? GridId { get; }
-    }
-
-    [NodeGroup(NodeGroupID.Apc)]
-    public class ApcNetNodeGroup : BaseNetConnectorNodeGroup<BaseApcNetComponent, IApcNet>, IApcNet
-    {
-        [ViewVariables]
-        private readonly Dictionary<ApcComponent, BatteryComponent> _apcBatteries = new();
-
-        [ViewVariables]
-        private readonly List<PowerProviderComponent> _providers = new();
-
-        [ViewVariables]
-        public bool Powered { get => _powered; private set => SetPowered(value); }
-        private bool _powered = false;
-
-        //Debug property
-        [ViewVariables]
-        private int TotalReceivers => _providers.SelectMany(provider => provider.LinkedReceivers).Count();
-
-        [ViewVariables]
-        private int TotalPowerReceiverLoad { get => _totalPowerReceiverLoad; set => SetTotalPowerReceiverLoad(value); }
-
-        GridId? IApcNet.GridId => GridId;
-
-        private int _totalPowerReceiverLoad = 0;
-
-        public static readonly IApcNet NullNet = new NullApcNet();
-
-        public override void Initialize(Node sourceNode)
-        {
-            base.Initialize(sourceNode);
-
-            EntitySystem.Get<ApcNetSystem>().AddApcNet(this);
-        }
-
-        protected override void AfterRemake(IEnumerable<INodeGroup> newGroups)
-        {
-            base.AfterRemake(newGroups);
-
-            foreach (var group in newGroups)
-            {
-                if (group is not ApcNetNodeGroup apcNet)
-                    continue;
-
-                apcNet.Powered = Powered;
-            }
-
-            StopUpdates();
-        }
-
-        protected override void OnGivingNodesForCombine(INodeGroup newGroup)
-        {
-            base.OnGivingNodesForCombine(newGroup);
-
-            if (newGroup is ApcNetNodeGroup apcNet)
-            {
-                apcNet.Powered = Powered;
-            }
-
-            StopUpdates();
-        }
-
-        private void StopUpdates()
-        {
-            EntitySystem.Get<ApcNetSystem>().RemoveApcNet(this);
-        }
-
-        #region IApcNet Methods
-
-        protected override void SetNetConnectorNet(BaseApcNetComponent netConnectorComponent)
-        {
-            netConnectorComponent.Net = this;
-        }
-
-        public void AddApc(ApcComponent apc)
-        {
-            if (!apc.Owner.TryGetComponent(out BatteryComponent? battery))
-            {
-                return;
-            }
-
-            _apcBatteries.Add(apc, battery);
-        }
-
-        public void RemoveApc(ApcComponent apc)
-        {
-            _apcBatteries.Remove(apc);
-        }
-
-        public void AddPowerProvider(PowerProviderComponent provider)
-        {
-            _providers.Add(provider);
-
-            foreach (var receiver in provider.LinkedReceivers)
-            {
-                TotalPowerReceiverLoad += receiver.Load;
-            }
-        }
-
-        public void RemovePowerProvider(PowerProviderComponent provider)
-        {
-            _providers.Remove(provider);
-
-            foreach (var receiver in provider.LinkedReceivers)
-            {
-                TotalPowerReceiverLoad -= receiver.Load;
-            }
-        }
-
-        public void UpdatePowerProviderReceivers(PowerProviderComponent provider, int oldLoad, int newLoad)
-        {
-            DebugTools.Assert(_providers.Contains(provider));
-            TotalPowerReceiverLoad -= oldLoad;
-            TotalPowerReceiverLoad += newLoad;
-        }
-
-        public void Update(float frameTime)
-        {
-            var remainingPowerNeeded = TotalPowerReceiverLoad * frameTime;
-
-            foreach (var apcBatteryPair in _apcBatteries)
-            {
-                var apc = apcBatteryPair.Key;
-
-                if (!apc.MainBreakerEnabled)
-                    continue;
-
-                var battery = apcBatteryPair.Value;
-
-                if (battery.CurrentCharge < remainingPowerNeeded)
-                {
-                    remainingPowerNeeded -= battery.CurrentCharge;
-                    battery.CurrentCharge = 0;
-                }
-                else
-                {
-                    battery.UseCharge(remainingPowerNeeded);
-                    remainingPowerNeeded = 0;
-                }
-
-                if (remainingPowerNeeded == 0)
-                    break;
-            }
-
-            Powered = remainingPowerNeeded == 0;
-        }
-
-        private void SetPowered(bool powered)
-        {
-            if (powered != Powered)
-            {
-                _powered = powered;
-                PoweredChanged();
-            }
-        }
-
-        private void PoweredChanged()
-        {
-            foreach (var provider in _providers)
-            {
-                foreach (var receiver in provider.LinkedReceivers)
-                {
-                    receiver.ApcPowerChanged();
-                }
-            }
-        }
-
-        private void SetTotalPowerReceiverLoad(int totalPowerReceiverLoad)
-        {
-            DebugTools.Assert(totalPowerReceiverLoad >= 0, $"Expected load equal to or greater than 0, was {totalPowerReceiverLoad}");
-            _totalPowerReceiverLoad = totalPowerReceiverLoad;
-        }
-
-        #endregion
-
-        private class NullApcNet : IApcNet
-        {
-            /// <summary>
-            ///     It is important that this returns false, so <see cref="PowerProviderComponent"/>s with a <see cref="NullApcNet"/> have no power.
-            /// </summary>
-            public bool Powered => false;
-            public GridId? GridId => default;
-            public void AddApc(ApcComponent apc) { }
-            public void AddPowerProvider(PowerProviderComponent provider) { }
-            public void RemoveApc(ApcComponent apc) { }
-            public void RemovePowerProvider(PowerProviderComponent provider) { }
-            public void UpdatePowerProviderReceivers(PowerProviderComponent provider, int oldLoad, int newLoad) { }
-            public void Update(float frameTime) { }
-        }
-    }
-}

Content.Server/APC/ApcNetSystem.cs

@@ -1,52 +0,0 @@
-#nullable enable
-using System.Collections.Generic;
-using Content.Shared.GameTicking;
-using JetBrains.Annotations;
-using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
-using Robust.Shared.Timing;
-
-namespace Content.Server.APC
-{
-    [UsedImplicitly]
-    internal sealed class ApcNetSystem : EntitySystem
-    {
-        [Dependency] private readonly IPauseManager _pauseManager = default!;
-
-        private HashSet<IApcNet> _apcNets = new();
-
-        public override void Initialize()
-        {
-            base.Initialize();
-
-            SubscribeLocalEvent<RoundRestartCleanupEvent>(Reset);
-        }
-
-        public override void Update(float frameTime)
-        {
-            foreach (var apcNet in _apcNets)
-            {
-                var gridId = apcNet.GridId;
-                if (gridId != null && !_pauseManager.IsGridPaused(gridId.Value))
-                    apcNet.Update(frameTime);
-            }
-        }
-
-        public void AddApcNet(ApcNetNodeGroup apcNet)
-        {
-            _apcNets.Add(apcNet);
-        }
-
-        public void RemoveApcNet(ApcNetNodeGroup apcNet)
-        {
-            _apcNets.Remove(apcNet);
-        }
-
-        public void Reset(RoundRestartCleanupEvent ev)
-        {
-            // NodeGroupSystem does not remake ApcNets affected during restarting until a frame later,
-            // when their grid is invalid. So, we are clearing them on round restart.
-            _apcNets.Clear();
-        }
-    }
-}

Content.Server/APC/Components/BaseApcNetComponent.cs

@@ -1,10 +0,0 @@
-#nullable enable
-using Content.Server.Power.Components;
-
-namespace Content.Server.APC.Components
-{
-    public abstract class BaseApcNetComponent : BaseNetConnectorComponent<IApcNet>
-    {
-        protected override IApcNet NullNet => ApcNetNodeGroup.NullNet;
-    }
-}

Content.Server/Access/Components/IdCardConsoleComponent.cs

@@ -34,7 +34,7 @@ namespace Content.Server.Access.Components
         private ContainerSlot _targetIdContainer = default!;
 
         [ViewVariables] private BoundUserInterface? UserInterface => Owner.GetUIOrNull(IdCardConsoleUiKey.Key);
-        [ViewVariables] private bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        [ViewVariables] private bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
 
         private bool PrivilegedIDEmpty => _privilegedIdContainer.ContainedEntities.Count < 1;
         private bool TargetIDEmpty => _targetIdContainer.ContainedEntities.Count < 1;

Content.Server/Arcade/Components/BlockGameArcadeComponent.cs

@@ -27,7 +27,7 @@ namespace Content.Server.Arcade.Components
         public override string Name => "BlockGameArcade";
         public override uint? NetID => ContentNetIDs.BLOCKGAME_ARCADE;
 
-        [ComponentDependency] private readonly PowerReceiverComponent? _powerReceiverComponent = default!;
+        [ComponentDependency] private readonly ApcPowerReceiverComponent? _powerReceiverComponent = default!;
 
         private bool Powered => _powerReceiverComponent?.Powered ?? false;
         private BoundUserInterface? UserInterface => Owner.GetUIOrNull(BlockGameUiKey.Key);

Content.Server/Arcade/Components/SpaceVillainArcadeComponent.cs

@@ -3,7 +3,7 @@ using System.Collections.Generic;
 using Content.Server.Power.Components;
 using Content.Server.UserInterface;
 using Content.Server.VendingMachines;
-using Content.Server.Wires.Components;
+using Content.Server.WireHacking;
 using Content.Shared.ActionBlocker;
 using Content.Shared.Arcade;
 using Content.Shared.Interaction;
@@ -28,7 +28,7 @@ namespace Content.Server.Arcade.Components
     {
         [Dependency] private readonly IRobustRandom _random = null!;
 
-        [ComponentDependency] private readonly PowerReceiverComponent? _powerReceiverComponent = default!;
+        [ComponentDependency] private readonly ApcPowerReceiverComponent? _powerReceiverComponent = default!;
         [ComponentDependency] private readonly WiresComponent? _wiresComponent = default!;
 
         private bool Powered => _powerReceiverComponent != null && _powerReceiverComponent.Powered;

Content.Server/Atmos/Components/BaseComputerUserInterfaceComponent.cs

@@ -20,7 +20,7 @@ namespace Content.Server.GameObjects.Components
         protected readonly object UserInterfaceKey;
 
         [ViewVariables] protected BoundUserInterface? UserInterface => Owner.GetUIOrNull(UserInterfaceKey);
-        [ViewVariables] public bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        [ViewVariables] public bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
 
         public BaseComputerUserInterfaceComponent(object key)
         {

Content.Server/Atmos/Components/GasTankComponent.cs

@@ -4,9 +4,9 @@ using System;
 using Content.Server.Atmos.EntitySystems;
 using Content.Server.Body.Respiratory;
 using Content.Server.Explosion;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.Interfaces;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using Content.Server.UserInterface;
 using Content.Shared.ActionBlocker;
 using Content.Shared.Actions;

Content.Server/Atmos/EntitySystems/AtmosphereSystem.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Diagnostics.CodeAnalysis;
 using Content.Server.Atmos.Components;
+using Content.Server.NodeContainer.EntitySystems;
 using Content.Shared.Atmos.EntitySystems;
 using Content.Shared.Maps;
 using JetBrains.Annotations;
@@ -33,6 +34,8 @@ namespace Content.Server.Atmos.EntitySystems
         {
             base.Initialize();
 
+            UpdatesAfter.Add(typeof(NodeGroupSystem));
+
             InitializeGases();
             InitializeCVars();
 

Content.Server/Atmos/Piping/Binary/Components/GasValveComponent.cs

@@ -1,5 +1,5 @@
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using Content.Shared.ActionBlocker;
 using Content.Shared.Interaction;
 using Content.Shared.Interaction.Helpers;

Content.Server/Atmos/Piping/Binary/EntitySystems/GasPassiveGateSystem.cs

@@ -1,8 +1,8 @@
 using System;
 using Content.Server.Atmos.Piping.Binary.Components;
 using Content.Server.Atmos.Piping.Components;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using Content.Shared.Atmos;
 using JetBrains.Annotations;
 using Robust.Shared.GameObjects;

Content.Server/Atmos/Piping/Binary/EntitySystems/GasPressurePumpSystem.cs

@@ -1,7 +1,7 @@
 using Content.Server.Atmos.Piping.Binary.Components;
 using Content.Server.Atmos.Piping.Components;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using Content.Shared.Atmos;
 using Content.Shared.Atmos.Piping;
 using JetBrains.Annotations;

Content.Server/Atmos/Piping/Binary/EntitySystems/GasVolumePumpSystem.cs

@@ -1,7 +1,7 @@
 using Content.Server.Atmos.Piping.Binary.Components;
 using Content.Server.Atmos.Piping.Components;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using JetBrains.Annotations;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;

Content.Server/Atmos/Piping/EntitySystems/AtmosUnsafeUnanchorSystem.cs

@@ -1,8 +1,8 @@
 using Content.Server.Atmos.EntitySystems;
 using Content.Server.Atmos.Piping.Components;
 using Content.Server.Construction.Components;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using Content.Shared.Atmos;
 using Content.Shared.Notification.Managers;
 using JetBrains.Annotations;

Content.Server/Atmos/Piping/Trinary/EntitySystems/GasFilterSystem.cs

@@ -1,7 +1,7 @@
 using Content.Server.Atmos.Piping.Components;
 using Content.Server.Atmos.Piping.Trinary.Components;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using Content.Shared.Atmos;
 using JetBrains.Annotations;
 using Robust.Shared.GameObjects;

Content.Server/Atmos/Piping/Trinary/EntitySystems/GasMixerSystem.cs

@@ -1,8 +1,8 @@
 using System;
 using Content.Server.Atmos.Piping.Components;
 using Content.Server.Atmos.Piping.Trinary.Components;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using Content.Shared.Atmos;
 using JetBrains.Annotations;
 using Robust.Shared.GameObjects;

Content.Server/Atmos/Piping/Unary/EntitySystems/GasCanisterSystem.cs

@@ -4,9 +4,9 @@ using Content.Server.Atmos.EntitySystems;
 using Content.Server.Atmos.Piping.Binary.Components;
 using Content.Server.Atmos.Piping.Components;
 using Content.Server.Atmos.Piping.Unary.Components;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.Hands.Components;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using Content.Server.UserInterface;
 using Content.Shared.ActionBlocker;
 using Content.Shared.Atmos;
@@ -62,7 +62,7 @@ namespace Content.Server.Atmos.Piping.Unary.EntitySystems
                 return;
 
             // Create a pipenet if we don't have one already.
-            portNode.TryAssignGroupIfNeeded();
+            portNode.CreateSingleNetImmediate();
             Get<AtmosphereSystem>().Merge(portNode.Air, canister.InitialMixture);
             portNode.Air.Temperature = canister.InitialMixture.Temperature;
             portNode.Volume = canister.InitialMixture.Volume;
@@ -90,7 +90,7 @@ namespace Content.Server.Atmos.Piping.Unary.EntitySystems
             }
 
             ui.SetState(new GasCanisterBoundUserInterfaceState(metadata.EntityName, portNode.Air.Pressure,
-                portNode.NodeGroup.Nodes.Count > 1, tankLabel, tankPressure,
+                portNode.NodeGroup!.Nodes.Count > 1, tankLabel, tankPressure,
                 canister.ReleasePressure, canister.ReleaseValve,
                 canister.MinReleasePressure, canister.MaxReleasePressure));
         }

Content.Server/Atmos/Piping/Unary/EntitySystems/GasOutletInjectorSystem.cs

@@ -1,7 +1,7 @@
 using Content.Server.Atmos.Piping.Components;
 using Content.Server.Atmos.Piping.Unary.Components;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using Content.Shared.Atmos;
 using JetBrains.Annotations;
 using Robust.Shared.GameObjects;

Content.Server/Atmos/Piping/Unary/EntitySystems/GasPassiveVentSystem.cs

@@ -1,8 +1,8 @@
 using System;
 using Content.Server.Atmos.Piping.Components;
 using Content.Server.Atmos.Piping.Unary.Components;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using Content.Shared.Atmos;
 using JetBrains.Annotations;
 using Robust.Shared.GameObjects;

Content.Server/Atmos/Piping/Unary/EntitySystems/GasPortableSystem.cs

@@ -2,8 +2,8 @@ using System.Diagnostics.CodeAnalysis;
 using Content.Server.Atmos.Piping.Binary.Components;
 using Content.Server.Atmos.Piping.Unary.Components;
 using Content.Server.Construction.Components;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using Content.Shared.Atmos.Piping.Unary.Components;
 using JetBrains.Annotations;
 using Robust.Server.GameObjects;

Content.Server/Atmos/Piping/Unary/EntitySystems/GasThermoMachineSystem.cs

@@ -1,8 +1,8 @@
 using Content.Server.Atmos.EntitySystems;
 using Content.Server.Atmos.Piping.Components;
 using Content.Server.Atmos.Piping.Unary.Components;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using Content.Shared.Atmos.Piping;
 using JetBrains.Annotations;
 using Robust.Server.GameObjects;

Content.Server/Atmos/Piping/Unary/EntitySystems/GasVentPumpSystem.cs

@@ -1,8 +1,8 @@
 using System;
 using Content.Server.Atmos.Piping.Components;
 using Content.Server.Atmos.Piping.Unary.Components;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using Content.Shared.Atmos;
 using Content.Shared.Atmos.Visuals;
 using JetBrains.Annotations;

Content.Server/Atmos/Piping/Unary/EntitySystems/GasVentScrubberSystem.cs

@@ -2,8 +2,8 @@ using System;
 using Content.Server.Atmos.EntitySystems;
 using Content.Server.Atmos.Piping.Components;
 using Content.Server.Atmos.Piping.Unary.Components;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.Nodes;
 using Content.Shared.Atmos;
 using Content.Shared.Atmos.Piping.Unary.Visuals;
 using JetBrains.Annotations;

Content.Server/BarSign/BarSignComponent.cs

@@ -35,7 +35,7 @@ namespace Content.Server.BarSign
             }
         }
 
-        private bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        private bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
 
         private void UpdateSignInfo()
         {

Content.Server/Battery/EntitySystems/BatteryDischargerSystem.cs

@@ -1,19 +0,0 @@
-#nullable enable
-using Content.Server.Power.Components;
-using JetBrains.Annotations;
-using Robust.Shared.GameObjects;
-
-namespace Content.Server.Battery.EntitySystems
-{
-    [UsedImplicitly]
-    internal sealed class BatteryDischargerSystem : EntitySystem
-    {
-        public override void Update(float frameTime)
-        {
-            foreach (var comp in ComponentManager.EntityQuery<BatteryDischargerComponent>(false))
-            {
-                comp.Update(frameTime);
-            }
-        }
-    }
-}

Content.Server/Battery/EntitySystems/BatteryStorageSystem.cs

@@ -1,19 +0,0 @@
-#nullable enable
-using Content.Server.Power.Components;
-using JetBrains.Annotations;
-using Robust.Shared.GameObjects;
-
-namespace Content.Server.Battery.EntitySystems
-{
-    [UsedImplicitly]
-    internal sealed class BatteryStorageSystem : EntitySystem
-    {
-        public override void Update(float frameTime)
-        {
-            foreach (var comp in ComponentManager.EntityQuery<BatteryStorageComponent>(false))
-            {
-                comp.Update(frameTime);
-            }
-        }
-    }
-}

Content.Server/Battery/EntitySystems/BatterySystem.cs

@@ -1,19 +0,0 @@
-#nullable enable
-using Content.Server.Battery.Components;
-using JetBrains.Annotations;
-using Robust.Shared.GameObjects;
-
-namespace Content.Server.Battery.EntitySystems
-{
-    [UsedImplicitly]
-    public class BatterySystem : EntitySystem
-    {
-        public override void Update(float frameTime)
-        {
-            foreach (var comp in ComponentManager.EntityQuery<BatteryComponent>(true))
-            {
-                comp.OnUpdate(frameTime);
-            }
-        }
-    }
-}

Content.Server/Botany/Components/SeedExtractorComponent.cs

@@ -14,7 +14,7 @@ namespace Content.Server.Botany.Components
     [RegisterComponent]
     public class SeedExtractorComponent : Component, IInteractUsing
     {
-        [ComponentDependency] private readonly PowerReceiverComponent? _powerReceiver = default!;
+        [ComponentDependency] private readonly ApcPowerReceiverComponent? _powerReceiver = default!;
 
         [Dependency] private readonly IRobustRandom _random = default!;
 

Content.Server/Cargo/Components/CargoConsoleComponent.cs

@@ -59,7 +59,7 @@ namespace Content.Server.Cargo.Components
         [DataField("requestOnly")]
         private bool _requestOnly = false;
 
-        private bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        private bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
         private CargoConsoleSystem _cargoConsoleSystem = default!;
 
         [ViewVariables] private BoundUserInterface? UserInterface => Owner.GetUIOrNull(CargoConsoleUiKey.Key);
@@ -171,7 +171,7 @@ namespace Content.Server.Cargo.Components
                     {
                         foreach (IEntity entity in enumerator)
                         {
-                            if (entity.HasComponent<CargoTelepadComponent>() && entity.TryGetComponent<PowerReceiverComponent>(out var powerReceiver) && powerReceiver.Powered)
+                            if (entity.HasComponent<CargoTelepadComponent>() && entity.TryGetComponent<ApcPowerReceiverComponent>(out var powerReceiver) && powerReceiver.Powered)
                             {
                                 cargoTelepad = entity;
                                 break;

Content.Server/Cargo/Components/CargoTelepadComponent.cs

@@ -43,14 +43,14 @@ namespace Content.Server.Cargo.Components
         {
             if (args.Powered && _currentState == CargoTelepadState.Unpowered) {
                 _currentState = CargoTelepadState.Idle;
-                if(Owner.TryGetComponent<SpriteComponent>(out var spriteComponent))
+                if(Owner.TryGetComponent<SpriteComponent>(out var spriteComponent) && spriteComponent.LayerCount > 0)
                     spriteComponent.LayerSetState(0, "idle");
                 TeleportLoop();
             }
             else if (!args.Powered)
             {
                 _currentState = CargoTelepadState.Unpowered;
-                if (Owner.TryGetComponent<SpriteComponent>(out var spriteComponent))
+                if (Owner.TryGetComponent<SpriteComponent>(out var spriteComponent) && spriteComponent.LayerCount > 0)
                     spriteComponent.LayerSetState(0, "offline");
             }
         }
@@ -59,14 +59,14 @@ namespace Content.Server.Cargo.Components
             if (_currentState == CargoTelepadState.Idle && _teleportQueue.Count > 0)
             {
                 _currentState = CargoTelepadState.Charging;
-                if (Owner.TryGetComponent<SpriteComponent>(out var spriteComponent))
+                if (Owner.TryGetComponent<SpriteComponent>(out var spriteComponent) && spriteComponent.LayerCount > 0)
                     spriteComponent.LayerSetState(0, "idle");
                 Owner.SpawnTimer((int) (TeleportDelay * 1000), () =>
                 {
                     if (!Deleted && !Owner.Deleted && _currentState == CargoTelepadState.Charging && _teleportQueue.Count > 0)
                     {
                         _currentState = CargoTelepadState.Teleporting;
-                        if (Owner.TryGetComponent<SpriteComponent>(out var spriteComponent))
+                        if (Owner.TryGetComponent<SpriteComponent>(out var spriteComponent) && spriteComponent.LayerCount > 0)
                             spriteComponent.LayerSetState(0, "beam");
                         Owner.SpawnTimer((int) (TeleportDuration * 1000), () =>
                         {
@@ -75,7 +75,7 @@ namespace Content.Server.Cargo.Components
                                 SoundSystem.Play(Filter.Pvs(Owner), "/Audio/Machines/phasein.ogg", Owner, AudioParams.Default.WithVolume(-8f));
                                 Owner.EntityManager.SpawnEntity(_teleportQueue[0].Product, Owner.Transform.Coordinates);
                                 _teleportQueue.RemoveAt(0);
-                                if (Owner.TryGetComponent<SpriteComponent>(out var spriteComponent))
+                                if (Owner.TryGetComponent<SpriteComponent>(out var spriteComponent) && spriteComponent.LayerCount > 0)
                                     spriteComponent.LayerSetState(0, "idle");
                                 _currentState = CargoTelepadState.Idle;
                                 TeleportLoop();

Content.Server/Chemistry/Components/ChemMasterComponent.cs

@@ -40,7 +40,7 @@ namespace Content.Server.Chemistry.Components
         [ViewVariables] private bool HasBeaker => _beakerContainer.ContainedEntity != null;
         [ViewVariables] private bool _bufferModeTransfer = true;
 
-        [ViewVariables] private bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        [ViewVariables] private bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
 
         [ViewVariables] private readonly Solution BufferSolution = new();
 

Content.Server/Chemistry/Components/ReagentDispenserComponent.cs

@@ -51,7 +51,7 @@ namespace Content.Server.Chemistry.Components
         [ViewVariables] private ReagentUnit _dispenseAmount = ReagentUnit.New(10);
         [UsedImplicitly] [ViewVariables] private SolutionContainerComponent? Solution => _beakerContainer.ContainedEntity?.GetComponent<SolutionContainerComponent>();
 
-        [ViewVariables] private bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        [ViewVariables] private bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
 
         [ViewVariables] private BoundUserInterface? UserInterface => Owner.GetUIOrNull(ReagentDispenserUiKey.Key);
 

Content.Server/Cloning/CloningSystem.cs

@@ -74,7 +74,7 @@ namespace Content.Server.Cloning
 
         public override void Update(float frameTime)
         {
-            foreach (var (cloning, power) in ComponentManager.EntityQuery<CloningPodComponent, PowerReceiverComponent>(true))
+            foreach (var (cloning, power) in ComponentManager.EntityQuery<CloningPodComponent, ApcPowerReceiverComponent>(true))
             {
                 if (cloning.UiKnownPowerState != power.Powered)
                 {

Content.Server/Cloning/Components/CloningPodComponent.cs

@@ -26,7 +26,7 @@ namespace Content.Server.Cloning.Components
         [Dependency] private readonly EuiManager _euiManager = null!;
 
         [ViewVariables]
-        public bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        public bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
 
         [ViewVariables]
         public BoundUserInterface? UserInterface =>

Content.Server/Communications/CommunicationsConsoleComponent.cs

@@ -25,7 +25,7 @@ namespace Content.Server.Communications
     {
         [Dependency] private readonly IGameTiming _gameTiming = default!;
         [Dependency] private readonly IChatManager _chatManager = default!;
-        private bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        private bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
 
         private RoundEndSystem RoundEndSystem => EntitySystem.Get<RoundEndSystem>();
 

Content.Server/Computer/ComputerComponent.cs

@@ -24,7 +24,7 @@ namespace Content.Server.Computer
             // Let's ensure the container manager and container are here.
             Owner.EnsureContainer<Container>("board", out var _);
 
-            if (Owner.TryGetComponent(out PowerReceiverComponent? powerReceiver) &&
+            if (Owner.TryGetComponent(out ApcPowerReceiverComponent? powerReceiver) &&
                 Owner.TryGetComponent(out AppearanceComponent? appearance))
             {
                 appearance.SetData(ComputerVisuals.Powered, powerReceiver.Powered);

Content.Server/Construction/Conditions/AllWiresCut.cs

@@ -1,6 +1,6 @@
 using System.Threading.Tasks;
 using Content.Server.GameObjects.Components;
-using Content.Server.Wires.Components;
+using Content.Server.WireHacking;
 using Content.Shared.Construction;
 using JetBrains.Annotations;
 using Robust.Shared.GameObjects;

Content.Server/Construction/Conditions/WirePanel.cs

@@ -1,6 +1,6 @@
 using System.Threading.Tasks;
 using Content.Server.GameObjects.Components;
-using Content.Server.Wires.Components;
+using Content.Server.WireHacking;
 using Content.Shared.Construction;
 using JetBrains.Annotations;
 using Robust.Shared.GameObjects;

Content.Server/Conveyor/ConveyorComponent.cs

@@ -19,7 +19,7 @@ namespace Content.Server.Conveyor
     {
         public override string Name => "Conveyor";
 
-        [ViewVariables] private bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        [ViewVariables] private bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
 
         /// <summary>
         ///     The angle to move entities by in relation to the owner's rotation.
@@ -105,7 +105,7 @@ namespace Content.Server.Conveyor
                 return false;
             }
 
-            if (Owner.TryGetComponent(out PowerReceiverComponent? receiver) &&
+            if (Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) &&
                 !receiver.Powered)
             {
                 return false;

Content.Server/DeviceNetwork/Connections/WiredNetworkConnection.cs

@@ -26,7 +26,7 @@ namespace Content.Server.DeviceNetwork.Connections
                 return false;
             }
 
-            if (_owner.TryGetComponent<PowerReceiverComponent>(out var powerReceiver)
+            if (_owner.TryGetComponent<ApcPowerReceiverComponent>(out var powerReceiver)
                 && TryGetWireNet(powerReceiver, out var ownNet)
                 && metadata.TryParseMetadata<INodeGroup>(WIRENET, out var senderNet))
             {
@@ -44,7 +44,7 @@ namespace Content.Server.DeviceNetwork.Connections
                 return new Metadata();
             }
 
-            if (_owner.TryGetComponent<PowerReceiverComponent>(out var powerReceiver)
+            if (_owner.TryGetComponent<ApcPowerReceiverComponent>(out var powerReceiver)
                 && TryGetWireNet(powerReceiver, out var net))
             {
                 var metadata = new Metadata
@@ -63,16 +63,16 @@ namespace Content.Server.DeviceNetwork.Connections
             return payload;
         }
 
-        private bool TryGetWireNet(PowerReceiverComponent powerReceiver, [NotNullWhen(true)] out INodeGroup? net)
+        private bool TryGetWireNet(ApcPowerReceiverComponent apcPowerReceiver, [NotNullWhen(true)] out INodeGroup? net)
         {
-            if (powerReceiver.Provider is PowerProviderComponent provider &&
-                provider.ProviderOwner.TryGetComponent<NodeContainerComponent>(out var nodeContainer))
+            var provider = apcPowerReceiver.Provider;
+            if (provider != null && provider.ProviderOwner.TryGetComponent<NodeContainerComponent>(out var nodeContainer))
             {
                 var nodes = nodeContainer.Nodes;
 
                 foreach (var node in nodes.Values)
                 {
-                    if (node.NodeGroupID == NodeGroupID.WireNet)
+                    if (node.NodeGroupID == NodeGroupID.WireNet && node.NodeGroup != null)
                     {
                         net = node.NodeGroup;
                         return true;

Content.Server/Disposal/Mailing/DisposalMailingUnitComponent.cs

@@ -117,7 +117,7 @@ namespace Content.Server.Disposal.Mailing
 
         [ViewVariables]
         public bool Powered =>
-            !Owner.TryGetComponent(out PowerReceiverComponent? receiver) ||
+            !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) ||
             receiver.Powered;
 
         [ViewVariables]
@@ -372,7 +372,7 @@ namespace Content.Server.Disposal.Mailing
 
         private void TogglePower()
         {
-            if (!Owner.TryGetComponent(out PowerReceiverComponent? receiver))
+            if (!Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver))
             {
                 return;
             }

Content.Server/Disposal/Unit/Components/DisposalUnitComponent.cs

@@ -107,7 +107,7 @@ namespace Content.Server.Disposal.Unit.Components
 
         [ViewVariables]
         public bool Powered =>
-            !Owner.TryGetComponent(out PowerReceiverComponent? receiver) ||
+            !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) ||
             receiver.Powered;
 
         [ViewVariables]
@@ -314,7 +314,7 @@ namespace Content.Server.Disposal.Unit.Components
 
         private void TogglePower()
         {
-            if (!Owner.TryGetComponent(out PowerReceiverComponent? receiver))
+            if (!Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver))
             {
                 return;
             }

Content.Server/Doors/Components/AirlockComponent.cs

@@ -3,7 +3,7 @@ using System;
 using System.Threading;
 using Content.Server.Power.Components;
 using Content.Server.VendingMachines;
-using Content.Server.Wires.Components;
+using Content.Server.WireHacking;
 using Content.Shared.Doors;
 using Content.Shared.Interaction;
 using Content.Shared.Notification;
@@ -36,7 +36,7 @@ namespace Content.Server.Doors.Components
         private readonly SharedAppearanceComponent? _appearanceComponent = null;
 
         [ComponentDependency]
-        private readonly PowerReceiverComponent? _receiverComponent = null;
+        private readonly ApcPowerReceiverComponent? _receiverComponent = null;
 
         [ComponentDependency]
         private readonly WiresComponent? _wiresComponent = null;

Content.Server/Gravity/GravityGeneratorComponent.cs

@@ -26,7 +26,7 @@ namespace Content.Server.Gravity
 
         private GravityGeneratorStatus _status;
 
-        public bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        public bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
 
         public bool SwitchedOn => _switchedOn;
 

Content.Server/IoC/ServerContentIoC.cs

@@ -50,7 +50,6 @@ namespace Content.Server.IoC
             IoCManager.Register<ActionManager, ActionManager>();
             IoCManager.Register<IPDAUplinkManager,PDAUplinkManager>();
             IoCManager.Register<INodeGroupFactory, NodeGroupFactory>();
-            IoCManager.Register<IPowerNetManager, PowerNetManager>();
             IoCManager.Register<BlackboardManager, BlackboardManager>();
             IoCManager.Register<ConsiderationsManager, ConsiderationsManager>();
             IoCManager.Register<IAccentManager, AccentManager>();

Content.Server/Kitchen/Components/MicrowaveComponent.cs

@@ -67,7 +67,7 @@ namespace Content.Server.Kitchen.Components
         [ViewVariables]
         private uint _currentCookTimerTime = 1;
 
-        private bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        private bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
         private bool _hasContents => Owner.TryGetComponent(out SolutionContainerComponent? solution) && (solution.ReagentList.Count > 0 || _storage.ContainedEntities.Count > 0);
         private bool _uiDirty = true;
         private bool _lostPower = false;

Content.Server/Kitchen/Components/ReagentGrinderComponent.cs

@@ -53,7 +53,7 @@ namespace Content.Server.Kitchen.Components
         [ViewVariables] private bool HasBeaker => _beakerContainer.ContainedEntity != null;
         [ViewVariables] private BoundUserInterface? UserInterface => Owner.GetUIOrNull(ReagentGrinderUiKey.Key);
 
-        private bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        private bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
 
         /// <summary>
         /// Should the BoundUI be told to update?

Content.Server/Lathe/Components/LatheComponent.cs

@@ -42,7 +42,7 @@ namespace Content.Server.Lathe.Components
         [ViewVariables]
         private LatheRecipePrototype? _producingRecipe;
         [ViewVariables]
-        private bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        private bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
 
         private static readonly TimeSpan InsertionTime = TimeSpan.FromSeconds(0.9f);
 

Content.Server/Light/Components/EmergencyLightComponent.cs

@@ -1,9 +1,9 @@
 #nullable enable
 using System;
 using System.Collections.Generic;
-using Content.Server.Battery.Components;
 using Content.Server.Power.Components;
 using Content.Shared.Examine;
+using Content.Shared.Light.Component;
 using Robust.Server.GameObjects;
 using Robust.Shared.GameObjects;
 using Robust.Shared.Localization;
@@ -60,7 +60,7 @@ namespace Content.Server.Light.Components
         /// </summary>
         public void UpdateState()
         {
-            if (!Owner.TryGetComponent(out PowerReceiverComponent? receiver))
+            if (!Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver))
             {
                 return;
             }
@@ -80,7 +80,7 @@ namespace Content.Server.Light.Components
 
         public void OnUpdate(float frameTime)
         {
-            if (Owner.Deleted || !Owner.TryGetComponent(out BatteryComponent? battery))
+            if (Owner.Deleted || !Owner.TryGetComponent(out BatteryComponent? battery) || Owner.Paused)
             {
                 return;
             }
@@ -96,9 +96,9 @@ namespace Content.Server.Light.Components
             else
             {
                 battery.CurrentCharge += _chargingWattage * frameTime * _chargingEfficiency;
-                if (battery.BatteryState == BatteryState.Full)
+                if (battery.IsFullyCharged)
                 {
-                    if (Owner.TryGetComponent(out PowerReceiverComponent? receiver))
+                    if (Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver))
                     {
                         receiver.Load = 1;
                     }
@@ -110,28 +110,24 @@ namespace Content.Server.Light.Components
 
         private void TurnOff()
         {
-            if (Owner.TryGetComponent(out SpriteComponent? sprite))
-            {
-                sprite.LayerSetState(0, "emergency_light_off");
-            }
-
             if (Owner.TryGetComponent(out PointLightComponent? light))
             {
                 light.Enabled = false;
             }
+
+            if (Owner.TryGetComponent(out AppearanceComponent? appearance))
+                appearance.SetData(EmergencyLightVisuals.On, false);
         }
 
         private void TurnOn()
         {
-            if (Owner.TryGetComponent(out SpriteComponent? sprite))
-            {
-                sprite.LayerSetState(0, "emergency_light_on");
-            }
-
             if (Owner.TryGetComponent(out PointLightComponent? light))
             {
                 light.Enabled = true;
             }
+
+            if (Owner.TryGetComponent(out AppearanceComponent? appearance))
+                appearance.SetData(EmergencyLightVisuals.On, true);
         }
 
         public override void HandleMessage(ComponentMessage message, IComponent? component)

Content.Server/Light/Components/PoweredLightComponent.cs

@@ -198,7 +198,7 @@ namespace Content.Server.Light.Components
         /// </summary>
         public void UpdateLight()
         {
-            var powerReceiver = Owner.GetComponent<PowerReceiverComponent>();
+            var powerReceiver = Owner.GetComponent<ApcPowerReceiverComponent>();
 
             if (LightBulb == null) // No light bulb.
             {

Content.Server/Medical/Components/MedicalScannerComponent.cs

@@ -48,7 +48,7 @@ namespace Content.Server.Medical.Components
         private readonly Vector2 _ejectOffset = new(0f, 0f);
 
         [ViewVariables]
-        private bool Powered => !Owner.TryGetComponent(out PowerReceiverComponent? receiver) || receiver.Powered;
+        private bool Powered => !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) || receiver.Powered;
         [ViewVariables]
         private BoundUserInterface? UserInterface => Owner.GetUIOrNull(MedicalScannerUiKey.Key);
 

Content.Server/NodeContainer/EntitySystems/NodeContainerSystem.cs

@@ -11,16 +11,51 @@ namespace Content.Server.NodeContainer.EntitySystems
         {
             base.Initialize();
 
+            SubscribeLocalEvent<NodeContainerComponent, ComponentInit>(OnInitEvent);
+            SubscribeLocalEvent<NodeContainerComponent, ComponentStartup>(OnStartupEvent);
+            SubscribeLocalEvent<NodeContainerComponent, ComponentShutdown>(OnShutdownEvent);
             SubscribeLocalEvent<NodeContainerComponent, AnchorStateChangedEvent>(OnAnchorStateChanged);
             SubscribeLocalEvent<NodeContainerComponent, RotateEvent>(OnRotateEvent);
         }
 
-        private void OnAnchorStateChanged(EntityUid uid, NodeContainerComponent component, AnchorStateChangedEvent args)
+        private static void OnInitEvent(EntityUid uid, NodeContainerComponent component, ComponentInit args)
         {
-            component.AnchorUpdate();
+            foreach (var (key, node) in component.Nodes)
+            {
+                node.Name = key;
+                node.Initialize(component.Owner);
+            }
         }
 
-        private void OnRotateEvent(EntityUid uid, NodeContainerComponent container, RotateEvent ev)
+        private static void OnStartupEvent(EntityUid uid, NodeContainerComponent component, ComponentStartup args)
+        {
+            foreach (var node in component.Nodes.Values)
+            {
+                node.OnContainerStartup();
+            }
+        }
+
+        private static void OnShutdownEvent(EntityUid uid, NodeContainerComponent component, ComponentShutdown args)
+        {
+            foreach (var node in component.Nodes.Values)
+            {
+                node.OnContainerShutdown();
+            }
+        }
+
+        private static void OnAnchorStateChanged(
+            EntityUid uid,
+            NodeContainerComponent component,
+            AnchorStateChangedEvent args)
+        {
+            foreach (var node in component.Nodes.Values)
+            {
+                node.AnchorUpdate();
+                node.AnchorStateChanged();
+            }
+        }
+
+        private static void OnRotateEvent(EntityUid uid, NodeContainerComponent container, RotateEvent ev)
         {
             if (ev.NewRotation == ev.OldRotation)
             {

Content.Server/NodeContainer/EntitySystems/NodeGroupSystem.cs

@@ -1,30 +1,385 @@
 using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using Content.Server.Administration.Managers;
 using Content.Server.NodeContainer.NodeGroups;
+using Content.Server.NodeContainer.Nodes;
+using Content.Shared.Administration;
+using Content.Shared.NodeContainer;
 using JetBrains.Annotations;
+using Robust.Server.Player;
+using Robust.Shared.Enums;
 using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Log;
+using Robust.Shared.Maths;
+using Robust.Shared.Utility;
 
 namespace Content.Server.NodeContainer.EntitySystems
 {
     [UsedImplicitly]
     public class NodeGroupSystem : EntitySystem
     {
-        private readonly HashSet<INodeGroup> _dirtyNodeGroups = new();
+        [Dependency] private readonly IEntityManager _entityManager = default!;
 
-        public void AddDirtyNodeGroup(INodeGroup nodeGroup)
+        [Dependency] private readonly IPlayerManager _playerManager = default!;
+        [Dependency] private readonly IAdminManager _adminManager = default!;
+        [Dependency] private readonly INodeGroupFactory _nodeGroupFactory = default!;
+        [Dependency] private readonly ILogManager _logManager = default!;
+
+        private readonly List<int> _visDeletes = new();
+        private readonly List<BaseNodeGroup> _visSends = new();
+
+        private readonly HashSet<IPlayerSession> _visPlayers = new();
+        private readonly HashSet<BaseNodeGroup> _toRemake = new();
+        private readonly HashSet<Node> _toRemove = new();
+        private readonly List<Node> _toReflood = new();
+
+        private ISawmill _sawmill = default!;
+
+        public bool VisEnabled => _visPlayers.Count != 0;
+
+        private int _gen = 1;
+        private int _groupNetIdCounter = 1;
+
+        public override void Initialize()
         {
-            _dirtyNodeGroups.Add(nodeGroup);
+            base.Initialize();
+
+            _sawmill = _logManager.GetSawmill("nodegroup");
+
+            _playerManager.PlayerStatusChanged += OnPlayerStatusChanged;
+
+            SubscribeNetworkEvent<NodeVis.MsgEnable>(HandleEnableMsg);
+        }
+
+        public override void Shutdown()
+        {
+            base.Shutdown();
+
+            _playerManager.PlayerStatusChanged -= OnPlayerStatusChanged;
+        }
+
+        private void HandleEnableMsg(NodeVis.MsgEnable msg, EntitySessionEventArgs args)
+        {
+            var session = (IPlayerSession) args.SenderSession;
+            if (!_adminManager.HasAdminFlag(session, AdminFlags.Debug))
+                return;
+
+            if (msg.Enabled)
+            {
+                _visPlayers.Add(session);
+                VisSendFullStateImmediate(session);
+            }
+            else
+            {
+                _visPlayers.Remove(session);
+            }
+        }
+
+        private void OnPlayerStatusChanged(object? sender, SessionStatusEventArgs e)
+        {
+            if (e.NewStatus == SessionStatus.Disconnected)
+                _visPlayers.Remove(e.Session);
+        }
+
+        public void QueueRemakeGroup(BaseNodeGroup group)
+        {
+            if (group.Remaking)
+                return;
+
+            _toRemake.Add(group);
+            group.Remaking = true;
+
+            foreach (var node in group.Nodes)
+            {
+                QueueReflood(node);
+            }
+        }
+
+        public void QueueReflood(Node node)
+        {
+            if (node.FlaggedForFlood)
+                return;
+
+            _toReflood.Add(node);
+            node.FlaggedForFlood = true;
+        }
+
+        public void QueueNodeRemove(Node node)
+        {
+            _toRemove.Add(node);
+        }
+
+        public void CreateSingleNetImmediate(Node node)
+        {
+            if (node.NodeGroup != null)
+                return;
+
+            QueueReflood(node);
+
+            InitGroup(node, new List<Node> {node});
         }
 
         public override void Update(float frameTime)
         {
             base.Update(frameTime);
 
-            foreach (var group in _dirtyNodeGroups)
+            DoGroupUpdates();
+            VisDoUpdate();
+        }
+
+        private void DoGroupUpdates()
+        {
+            // "Why is there a separate queue for group remakes and node refloods when they both cause eachother"
+            // Future planning for the potential ability to do more intelligent group updating.
+
+            if (_toRemake.Count == 0 && _toReflood.Count == 0 && _toRemove.Count == 0)
+                return;
+
+            var sw = Stopwatch.StartNew();
+
+            foreach (var toRemove in _toRemove)
             {
-                group.RemakeGroup();
+                if (toRemove.NodeGroup == null)
+                    continue;
+
+                var group = (BaseNodeGroup) toRemove.NodeGroup;
+
+                group.RemoveNode(toRemove);
+                toRemove.NodeGroup = null;
+
+                QueueRemakeGroup(group);
             }
 
-            _dirtyNodeGroups.Clear();
+            // Break up all remaking groups.
+            // Don't clear the list yet, we'll come back to these later.
+            foreach (var toRemake in _toRemake)
+            {
+                QueueRemakeGroup(toRemake);
+            }
+
+            _gen += 1;
+
+            // Go over all nodes to calculate reachable nodes and make an undirected graph out of them.
+            // Node.GetReachableNodes() may return results asymmetrically,
+            // i.e. node A may return B, but B may not return A.
+            //
+            // Must be for loop to allow concurrent modification from RemakeGroupImmediate.
+            for (var i = 0; i < _toReflood.Count; i++)
+            {
+                var node = _toReflood[i];
+
+                if (node.Deleting)
+                    continue;
+
+                ClearReachableIfNecessary(node);
+
+                if (node.NodeGroup?.Remaking == false)
+                {
+                    QueueRemakeGroup((BaseNodeGroup) node.NodeGroup);
+                }
+
+                foreach (var compatible in GetCompatibleNodes(node))
+                {
+                    ClearReachableIfNecessary(compatible);
+
+                    if (compatible.NodeGroup?.Remaking == false)
+                    {
+                        // We are expanding into an existing group,
+                        // remake it so that we can treat it uniformly.
+                        var group = (BaseNodeGroup) compatible.NodeGroup;
+                        QueueRemakeGroup(group);
+                    }
+
+                    node.ReachableNodes.Add(compatible);
+                    compatible.ReachableNodes.Add(node);
+                }
+            }
+
+            var newGroups = new List<BaseNodeGroup>();
+
+            // Flood fill over nodes. Every node will only be flood filled once.
+            foreach (var node in _toReflood)
+            {
+                node.FlaggedForFlood = false;
+
+                // Check if already flood filled.
+                if (node.FloodGen == _gen || node.Deleting)
+                    continue;
+
+                // Flood fill
+                var groupNodes = FloodFillNode(node);
+
+                var newGroup = InitGroup(node, groupNodes);
+                newGroups.Add(newGroup);
+            }
+
+            // Go over dead groups that need to be cleaned up.
+            // Tell them to push their data to new groups too.
+            foreach (var oldGroup in _toRemake)
+            {
+                // Group by the NEW group.
+                var newGrouped = oldGroup.Nodes.GroupBy(n => n.NodeGroup);
+
+                oldGroup.Removed = true;
+                oldGroup.AfterRemake(newGrouped);
+                if (VisEnabled)
+                    _visDeletes.Add(oldGroup.NetId);
+            }
+
+            var refloodCount = _toReflood.Count;
+
+            _toReflood.Clear();
+            _toRemake.Clear();
+            _toRemove.Clear();
+
+            foreach (var group in newGroups)
+            {
+                foreach (var node in group.Nodes)
+                {
+                    node.OnPostRebuild();
+                }
+            }
+
+            _sawmill.Debug($"Updated node groups in {sw.Elapsed.TotalMilliseconds}ms. {newGroups.Count} new groups, {refloodCount} nodes processed.");
+        }
+
+        private void ClearReachableIfNecessary(Node node)
+        {
+            if (node.UndirectGen != _gen)
+            {
+                node.ReachableNodes.Clear();
+                node.UndirectGen = _gen;
+            }
+        }
+
+        private BaseNodeGroup InitGroup(Node node, List<Node> groupNodes)
+        {
+            var newGroup = (BaseNodeGroup) _nodeGroupFactory.MakeNodeGroup(node.NodeGroupID);
+            newGroup.Initialize(node);
+            newGroup.NetId = _groupNetIdCounter++;
+
+            var netIdCounter = 0;
+            foreach (var groupNode in groupNodes)
+            {
+                groupNode.NodeGroup = newGroup;
+                groupNode.NetId = ++netIdCounter;
+            }
+
+            newGroup.LoadNodes(groupNodes);
+
+            if (VisEnabled)
+                _visSends.Add(newGroup);
+
+            return newGroup;
+        }
+
+        private List<Node> FloodFillNode(Node rootNode)
+        {
+            // All nodes we're filling into that currently have NO network.
+            var allNodes = new List<Node>();
+
+            var stack = new Stack<Node>();
+            stack.Push(rootNode);
+            rootNode.FloodGen = _gen;
+
+            while (stack.TryPop(out var node))
+            {
+                allNodes.Add(node);
+
+                foreach (var reachable in node.ReachableNodes)
+                {
+                    if (reachable.FloodGen == _gen)
+                        continue;
+
+                    reachable.FloodGen = _gen;
+                    stack.Push(reachable);
+                }
+            }
+
+            return allNodes;
+        }
+
+        private static IEnumerable<Node> GetCompatibleNodes(Node node)
+        {
+            foreach (var reachable in node.GetReachableNodes())
+            {
+                DebugTools.Assert(reachable != node, "GetReachableNodes() should not include self.");
+
+                if (reachable.Connectable && reachable.NodeGroupID == node.NodeGroupID)
+                    yield return reachable;
+            }
+        }
+
+        private void VisDoUpdate()
+        {
+            if (_visSends.Count == 0 && _visDeletes.Count == 0)
+                return;
+
+            var msg = new NodeVis.MsgData();
+
+            msg.GroupDeletions.AddRange(_visDeletes);
+            msg.Groups.AddRange(_visSends.Select(VisMakeGroupState));
+
+            _visSends.Clear();
+            _visDeletes.Clear();
+
+            foreach (var player in _visPlayers)
+            {
+                RaiseNetworkEvent(msg, player.ConnectedClient);
+            }
+        }
+
+        private void VisSendFullStateImmediate(IPlayerSession player)
+        {
+            var msg = new NodeVis.MsgData();
+
+            var allNetworks = ComponentManager
+                .EntityQuery<NodeContainerComponent>()
+                .SelectMany(nc => nc.Nodes.Values)
+                .Select(n => (BaseNodeGroup?) n.NodeGroup)
+                .Where(n => n != null)
+                .Distinct();
+
+            foreach (var network in allNetworks)
+            {
+                msg.Groups.Add(VisMakeGroupState(network!));
+            }
+
+            RaiseNetworkEvent(msg, player.ConnectedClient);
+        }
+
+        private static NodeVis.GroupData VisMakeGroupState(BaseNodeGroup group)
+        {
+            return new()
+            {
+                NetId = group.NetId,
+                GroupId = group.GroupId.ToString(),
+                Color = CalcNodeGroupColor(group),
+                Nodes = group.Nodes.Select(n => new NodeVis.NodeDatum
+                {
+                    Name = n.Name,
+                    NetId = n.NetId,
+                    Reachable = n.ReachableNodes.Select(r => r.NetId).ToArray(),
+                    Entity = n.Owner.Uid,
+                    Type = n.GetType().Name
+                }).ToArray()
+            };
+        }
+
+        private static Color CalcNodeGroupColor(BaseNodeGroup group)
+        {
+            return group.GroupId switch
+            {
+                NodeGroupID.HVPower => Color.Orange,
+                NodeGroupID.MVPower => Color.Yellow,
+                NodeGroupID.Apc => Color.LimeGreen,
+                NodeGroupID.AMEngine => Color.Purple,
+                NodeGroupID.Pipe => Color.Blue,
+                NodeGroupID.WireNet => Color.DarkMagenta,
+                _ => Color.White
+            };
         }
     }
 }

Content.Server/NodeContainer/NodeContainerComponent.cs

@@ -20,60 +20,18 @@ namespace Content.Server.NodeContainer
     {
         public override string Name => "NodeContainer";
 
-        [ViewVariables]
-        public IReadOnlyDictionary<string, Node> Nodes => _nodes;
+        [DataField("nodes")] [ViewVariables] public Dictionary<string, Node> Nodes { get; } = new();
 
-        [DataField("nodes")]
-        private readonly Dictionary<string, Node> _nodes = new();
-
-        [DataField("examinable")]
-        private bool _examinable = false;
-
-        protected override void Initialize()
-        {
-            base.Initialize();
-            foreach (var node in _nodes.Values)
-            {
-                node.Initialize(Owner);
-            }
-        }
-
-        protected override void Startup()
-        {
-            base.Startup();
-            foreach (var node in _nodes.Values)
-            {
-                node.OnContainerStartup();
-            }
-        }
-
-        protected override void Shutdown()
-        {
-            base.Shutdown();
-
-            foreach (var node in _nodes.Values)
-            {
-                node.OnContainerShutdown();
-            }
-        }
-
-        public void AnchorUpdate()
-        {
-            foreach (var node in Nodes.Values)
-            {
-                node.AnchorUpdate();
-                node.AnchorStateChanged();
-            }
-        }
+        [DataField("examinable")] private bool _examinable = false;
 
         public T GetNode<T>(string identifier) where T : Node
         {
-            return (T)_nodes[identifier];
+            return (T) Nodes[identifier];
         }
 
         public bool TryGetNode<T>(string identifier, [NotNullWhen(true)] out T? node) where T : Node
         {
-            if (_nodes.TryGetValue(identifier, out var n) && n is T t)
+            if (Nodes.TryGetValue(identifier, out var n) && n is T t)
             {
                 node = t;
                 return true;

Content.Server/NodeContainer/NodeGroups/BaseNetConnectorNodeGroup.cs

@@ -1,37 +0,0 @@
-#nullable enable
-using System.Collections.Generic;
-using System.Linq;
-using Content.Server.NodeContainer.Nodes;
-using Content.Server.Power.Components;
-
-namespace Content.Server.NodeContainer.NodeGroups
-{
-    public abstract class BaseNetConnectorNodeGroup<TNetConnector, TNetType> : BaseNodeGroup where TNetConnector : BaseNetConnectorComponent<TNetType>
-    {
-        private readonly Dictionary<Node, List<TNetConnector>> _netConnectorComponents = new();
-
-        protected override void OnAddNode(Node node)
-        {
-            var newNetConnectorComponents = node.Owner
-                .GetAllComponents<TNetConnector>()
-                .Where(powerComp => (NodeGroupID) powerComp.Voltage == node.NodeGroupID)
-                .ToList();
-            _netConnectorComponents[node] = newNetConnectorComponents;
-            foreach (var netConnectorComponent in newNetConnectorComponents)
-            {
-                SetNetConnectorNet(netConnectorComponent);
-            }
-        }
-
-        protected abstract void SetNetConnectorNet(TNetConnector netConnectorComponent);
-
-        protected override void OnRemoveNode(Node node)
-        {
-            foreach (var netConnectorComponent in _netConnectorComponents[node])
-            {
-                netConnectorComponent.ClearNet();
-            }
-            _netConnectorComponents.Remove(node);
-        }
-    }
-}

Content.Server/NodeContainer/NodeGroups/BaseNodeGroup.cs

@@ -0,0 +1,91 @@
+#nullable enable
+using System.Collections.Generic;
+using System.Linq;
+using Content.Server.NodeContainer.EntitySystems;
+using Content.Server.NodeContainer.Nodes;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Server.NodeContainer.NodeGroups
+{
+    /// <summary>
+    ///     Maintains a collection of <see cref="Node"/>s, and performs operations requiring a list of
+    ///     all connected <see cref="Node"/>s.
+    /// </summary>
+    public interface INodeGroup
+    {
+        bool Remaking { get; }
+
+        IReadOnlyList<Node> Nodes { get; }
+
+        void Create(NodeGroupID groupId);
+
+        void Initialize(Node sourceNode);
+
+        void RemoveNode(Node node);
+
+        void LoadNodes(List<Node> groupNodes);
+
+        // In theory, the SS13 curse ensures this method will never be called.
+        void AfterRemake(IEnumerable<IGrouping<INodeGroup?, Node>> newGroups);
+
+        // TODO: Why is this method needed?
+        void QueueRemake();
+    }
+
+    [NodeGroup(NodeGroupID.Default, NodeGroupID.WireNet)]
+    public class BaseNodeGroup : INodeGroup
+    {
+        public bool Remaking { get; set; }
+
+        IReadOnlyList<Node> INodeGroup.Nodes => Nodes;
+
+        [ViewVariables] public readonly List<Node> Nodes = new();
+
+        [ViewVariables] public int NodeCount => Nodes.Count;
+
+        /// <summary>
+        ///     Debug variable to indicate that this NodeGroup should not be being used by anything.
+        /// </summary>
+        [ViewVariables]
+        public bool Removed { get; set; } = false;
+
+        [ViewVariables]
+        protected GridId GridId { get; private set; }
+
+        [ViewVariables]
+        public int NetId;
+
+        [ViewVariables]
+        public NodeGroupID GroupId { get; private set; }
+
+        public void Create(NodeGroupID groupId)
+        {
+            GroupId = groupId;
+        }
+
+        public virtual void Initialize(Node sourceNode)
+        {
+            // TODO: Can we get rid of this GridId?
+            GridId = sourceNode.Owner.Transform.GridID;
+        }
+
+        public virtual void RemoveNode(Node node)
+        {
+        }
+
+        public virtual void LoadNodes(
+            List<Node> groupNodes)
+        {
+            Nodes.AddRange(groupNodes);
+        }
+
+        public virtual void AfterRemake(IEnumerable<IGrouping<INodeGroup?, Node>> newGroups) { }
+
+        public void QueueRemake()
+        {
+            EntitySystem.Get<NodeGroupSystem>().QueueRemakeGroup(this);
+        }
+    }
+}

Content.Server/NodeContainer/NodeGroups/INodeGroup.cs

@@ -1,132 +0,0 @@
-#nullable enable
-using System.Collections.Generic;
-using Content.Server.NodeContainer.EntitySystems;
-using Content.Server.NodeContainer.Nodes;
-using Robust.Shared.GameObjects;
-using Robust.Shared.Map;
-using Robust.Shared.ViewVariables;
-
-namespace Content.Server.NodeContainer.NodeGroups
-{
-    /// <summary>
-    ///     Maintains a collection of <see cref="Node"/>s, and performs operations requiring a list of
-    ///     all connected <see cref="Node"/>s.
-    /// </summary>
-    public interface INodeGroup
-    {
-        IReadOnlyList<Node> Nodes { get; }
-
-        void Initialize(Node sourceNode);
-
-        void AddNode(Node node);
-
-        void RemoveNode(Node node);
-
-        void CombineGroup(INodeGroup newGroup);
-
-        void RemakeGroup();
-    }
-
-    [NodeGroup(NodeGroupID.Default, NodeGroupID.WireNet)]
-    public class BaseNodeGroup : INodeGroup
-    {
-        [ViewVariables]
-        public IReadOnlyList<Node> Nodes => _nodes;
-        private readonly List<Node> _nodes = new();
-
-        [ViewVariables]
-        public int NodeCount => Nodes.Count;
-
-        /// <summary>
-        ///     Debug variable to indicate that this NodeGroup should not be being used by anything.
-        /// </summary>
-        [ViewVariables]
-        public bool Removed { get; private set; } = false;
-
-        public static readonly INodeGroup NullGroup = new NullNodeGroup();
-
-        protected GridId GridId { get; private set;}
-
-        public virtual void Initialize(Node sourceNode)
-        {
-            GridId = sourceNode.Owner.Transform.GridID;
-        }
-
-        public void AddNode(Node node)
-        {
-            _nodes.Add(node);
-            OnAddNode(node);
-        }
-
-        public void RemoveNode(Node node)
-        {
-            _nodes.Remove(node);
-            OnRemoveNode(node);
-            EntitySystem.Get<NodeGroupSystem>().AddDirtyNodeGroup(this);
-        }
-
-        public void CombineGroup(INodeGroup newGroup)
-        {
-            if (newGroup.Nodes.Count < Nodes.Count)
-            {
-                newGroup.CombineGroup(this);
-                return;
-            }
-
-            OnGivingNodesForCombine(newGroup);
-
-            foreach (var node in Nodes)
-            {
-                node.NodeGroup = newGroup;
-            }
-
-            Removed = true;
-        }
-
-        /// <summary>
-        ///     Causes all <see cref="Node"/>s to remake their groups. Called when a <see cref="Node"/> is removed
-        ///     and may have split a group in two, so multiple new groups may need to be formed.
-        /// </summary>
-        public void RemakeGroup()
-        {
-            foreach (var node in Nodes)
-            {
-                node.ClearNodeGroup();
-            }
-
-            var newGroups = new HashSet<INodeGroup>();
-
-            foreach (var node in Nodes)
-            {
-                if (node.TryAssignGroupIfNeeded())
-                {
-                    node.SpreadGroup();
-                    newGroups.Add(node.NodeGroup);
-                }
-            }
-
-            AfterRemake(newGroups);
-
-            Removed = true;
-        }
-
-        protected virtual void OnAddNode(Node node) { }
-
-        protected virtual void OnRemoveNode(Node node) { }
-
-        protected virtual void OnGivingNodesForCombine(INodeGroup newGroup) { }
-
-        protected virtual void AfterRemake(IEnumerable<INodeGroup> newGroups) { }
-
-        protected class NullNodeGroup : INodeGroup
-        {
-            public IReadOnlyList<Node> Nodes => _nodes;
-            private readonly List<Node> _nodes = new();
-            public void Initialize(Node sourceNode) { }
-            public void AddNode(Node node) { }
-            public void CombineGroup(INodeGroup newGroup) { }
-            public void RemoveNode(Node node) { }
-            public void RemakeGroup() { }
-        }
-    }
-}

Content.Server/NodeContainer/NodeGroups/NodeGroupAttribute.cs

@@ -1,5 +1,6 @@
 #nullable enable
 using System;
+using JetBrains.Annotations;
 
 namespace Content.Server.NodeContainer.NodeGroups
 {
@@ -9,6 +10,7 @@ namespace Content.Server.NodeContainer.NodeGroups
     ///     have the same type of <see cref="INodeGroup"/>. Used by <see cref="INodeGroupFactory"/>.
     /// </summary>
     [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
+    [MeansImplicitUse]
     public class NodeGroupAttribute : Attribute
     {
         public NodeGroupID[] NodeGroupIDs { get; }

Content.Server/NodeContainer/NodeGroups/NodeGroupFactory.cs

@@ -19,7 +19,7 @@ namespace Content.Server.NodeContainer.NodeGroups
         /// <summary>
         ///     Returns a new <see cref="INodeGroup"/> instance.
         /// </summary>
-        INodeGroup MakeNodeGroup(Node sourceNode);
+        INodeGroup MakeNodeGroup(NodeGroupID id);
     }
 
     public class NodeGroupFactory : INodeGroupFactory
@@ -45,15 +45,14 @@ namespace Content.Server.NodeContainer.NodeGroups
             }
         }
 
-        public INodeGroup MakeNodeGroup(Node sourceNode)
+        public INodeGroup MakeNodeGroup(NodeGroupID id)
         {
-            if (_groupTypes.TryGetValue(sourceNode.NodeGroupID, out var type))
-            {
-                var nodeGroup = _typeFactory.CreateInstance<INodeGroup>(type);
-                nodeGroup.Initialize(sourceNode);
-                return nodeGroup;
-            }
-            throw new ArgumentException($"{sourceNode.NodeGroupID} did not have an associated {nameof(INodeGroup)}.");
+            if (!_groupTypes.TryGetValue(id, out var type))
+                throw new ArgumentException($"{id} did not have an associated {nameof(INodeGroup)} implementation.");
+
+            var instance = _typeFactory.CreateInstance<INodeGroup>(type);
+            instance.Create(id);
+            return instance;
         }
     }
 

Content.Server/NodeContainer/NodeGroups/PipeNet.cs

@@ -1,14 +1,15 @@
 #nullable enable
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using Content.Server.Atmos;
 using Content.Server.Atmos.Components;
 using Content.Server.Atmos.EntitySystems;
-using Content.Server.GameObjects.Components.NodeContainer.Nodes;
 using Content.Server.Interfaces;
 using Content.Server.NodeContainer.Nodes;
 using Content.Shared.Atmos;
 using Robust.Shared.GameObjects;
+using Robust.Shared.Maths;
 using Robust.Shared.ViewVariables;
 
 namespace Content.Server.NodeContainer.NodeGroups
@@ -24,17 +25,15 @@ namespace Content.Server.NodeContainer.NodeGroups
     [NodeGroup(NodeGroupID.Pipe)]
     public class PipeNet : BaseNodeGroup, IPipeNet
     {
-        [ViewVariables]
-        public GasMixture Air { get; set; } = new() {Temperature = Atmospherics.T20C};
+        [ViewVariables] public GasMixture Air { get; set; } = new() {Temperature = Atmospherics.T20C};
 
-        public static readonly IPipeNet NullNet = new NullPipeNet();
-
-        [ViewVariables]
-        private readonly List<PipeNode> _pipes = new();
+        [ViewVariables] private readonly List<PipeNode> _pipes = new();
 
         [ViewVariables] private AtmosphereSystem? _atmosphereSystem;
 
-        [ViewVariables] private IGridAtmosphereComponent? GridAtmos => _atmosphereSystem?.GetGridAtmosphere(GridId);
+        [ViewVariables]
+        private IGridAtmosphereComponent? GridAtmos =>
+            _atmosphereSystem?.GetGridAtmosphere(GridId);
 
         public override void Initialize(Node sourceNode)
         {
@@ -49,35 +48,30 @@ namespace Content.Server.NodeContainer.NodeGroups
             _atmosphereSystem?.React(Air, this);
         }
 
-        protected override void OnAddNode(Node node)
+        public override void LoadNodes(List<Node> groupNodes)
         {
-            if (node is not PipeNode pipeNode)
-                return;
+            base.LoadNodes(groupNodes);
 
-            _pipes.Add(pipeNode);
-            pipeNode.JoinPipeNet(this);
-            Air.Volume += pipeNode.Volume;
+            foreach (var node in groupNodes)
+            {
+                var pipeNode = (PipeNode) node;
+                _pipes.Add(pipeNode);
+                pipeNode.JoinPipeNet(this);
+                Air.Volume += pipeNode.Volume;
+            }
         }
 
-        protected override void OnRemoveNode(Node node)
+        public override void RemoveNode(Node node)
         {
-            RemoveFromGridAtmos();
-            if (node is not PipeNode pipeNode)
-                return;
+            base.RemoveNode(node);
 
-            pipeNode.ClearPipeNet();
+            var pipeNode = (PipeNode) node;
+            Air.Volume -= pipeNode.Volume;
+            // TODO: Bad O(n^2)
             _pipes.Remove(pipeNode);
         }
 
-        protected override void OnGivingNodesForCombine(INodeGroup newGroup)
-        {
-            if (newGroup is not IPipeNet newPipeNet)
-                return;
-
-            EntitySystem.Get<AtmosphereSystem>().Merge(newPipeNet.Air, Air);
-        }
-
-        protected override void AfterRemake(IEnumerable<INodeGroup> newGroups)
+        public override void AfterRemake(IEnumerable<IGrouping<INodeGroup?, Node>> newGroups)
         {
             RemoveFromGridAtmos();
 
@@ -86,14 +80,15 @@ namespace Content.Server.NodeContainer.NodeGroups
 
             foreach (var newGroup in newGroups)
             {
-                if (newGroup is not IPipeNet newPipeNet)
+                if (newGroup.Key is not IPipeNet newPipeNet)
                     continue;
 
                 var newAir = newPipeNet.Air;
+                var newVolume = newGroup.Cast<PipeNode>().Sum(n => n.Volume);
 
                 buffer.Clear();
                 atmosphereSystem.Merge(buffer, Air);
-                buffer.Multiply(MathF.Min(newAir.Volume / Air.Volume, 1f));
+                buffer.Multiply(MathF.Min(newVolume / Air.Volume, 1f));
                 atmosphereSystem.Merge(newAir, buffer);
             }
         }
@@ -102,20 +97,5 @@ namespace Content.Server.NodeContainer.NodeGroups
         {
             GridAtmos?.RemovePipeNet(this);
         }
-
-        private class NullPipeNet : NullNodeGroup, IPipeNet
-        {
-            private readonly GasMixture _air;
-
-            GasMixture IGasMixtureHolder.Air { get => _air; set { } }
-
-            public NullPipeNet()
-            {
-                _air = new GasMixture(1f) {Temperature = Atmospherics.T20C};
-                _air.MarkImmutable();
-            }
-
-            public void Update() { }
-        }
     }
 }

Content.Server/NodeContainer/NodeGroups/PowerNetNodeGroup.cs

@@ -1,164 +0,0 @@
-#nullable enable
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using Content.Server.Power.Components;
-using Robust.Shared.IoC;
-using Robust.Shared.ViewVariables;
-
-namespace Content.Server.NodeContainer.NodeGroups
-{
-    public interface IPowerNet
-    {
-        void AddSupplier(PowerSupplierComponent supplier);
-
-        void RemoveSupplier(PowerSupplierComponent supplier);
-
-        void UpdateSupplierSupply(PowerSupplierComponent supplier, int oldSupplyRate, int newSupplyRate);
-
-        void AddConsumer(PowerConsumerComponent consumer);
-
-        void RemoveConsumer(PowerConsumerComponent consumer);
-
-        void UpdateConsumerDraw(PowerConsumerComponent consumer, int oldDrawRate, int newDrawRate);
-
-        void UpdateConsumerPriority(PowerConsumerComponent consumer, Priority oldPriority, Priority newPriority);
-
-        void UpdateConsumerReceivedPower();
-    }
-
-    [NodeGroup(NodeGroupID.HVPower, NodeGroupID.MVPower)]
-    public class PowerNetNodeGroup : BaseNetConnectorNodeGroup<BasePowerNetComponent, IPowerNet>, IPowerNet
-    {
-        private static readonly Priority[] CachedPriorities = (Priority[]) Enum.GetValues(typeof(Priority));
-
-        [Dependency] private readonly IPowerNetManager _powerNetManager = default!;
-
-        [ViewVariables]
-        private readonly List<PowerSupplierComponent> _suppliers = new();
-
-        [ViewVariables]
-        private int _totalSupply = 0;
-
-        [ViewVariables]
-        private readonly Dictionary<Priority, List<PowerConsumerComponent>> _consumersByPriority = new();
-
-        [ViewVariables]
-        private readonly Dictionary<Priority, int> _drawByPriority = new();
-
-        public static readonly IPowerNet NullNet = new NullPowerNet();
-
-        public PowerNetNodeGroup()
-        {
-            foreach (Priority priority in Enum.GetValues(typeof(Priority)))
-            {
-                _consumersByPriority.Add(priority, new List<PowerConsumerComponent>());
-                _drawByPriority.Add(priority, 0);
-            }
-        }
-
-        protected override void SetNetConnectorNet(BasePowerNetComponent netConnectorComponent)
-        {
-            netConnectorComponent.Net = this;
-        }
-
-        #region IPowerNet Methods
-
-        public void AddSupplier(PowerSupplierComponent supplier)
-        {
-            _suppliers.Add(supplier);
-            _totalSupply += supplier.SupplyRate;
-            _powerNetManager.AddDirtyPowerNet(this);
-        }
-
-        public void RemoveSupplier(PowerSupplierComponent supplier)
-        {
-            Debug.Assert(_suppliers.Contains(supplier));
-            _suppliers.Remove(supplier);
-            _totalSupply -= supplier.SupplyRate;
-            _powerNetManager.AddDirtyPowerNet(this);
-        }
-
-        public void UpdateSupplierSupply(PowerSupplierComponent supplier, int oldSupplyRate, int newSupplyRate)
-        {
-            Debug.Assert(_suppliers.Contains(supplier));
-            _totalSupply -= oldSupplyRate;
-            _totalSupply += newSupplyRate;
-            _powerNetManager.AddDirtyPowerNet(this);
-        }
-
-        public void AddConsumer(PowerConsumerComponent consumer)
-        {
-            _consumersByPriority[consumer.Priority].Add(consumer);
-            _drawByPriority[consumer.Priority] += consumer.DrawRate;
-            _powerNetManager.AddDirtyPowerNet(this);
-        }
-
-        public void RemoveConsumer(PowerConsumerComponent consumer)
-        {
-            Debug.Assert(_consumersByPriority[consumer.Priority].Contains(consumer));
-            consumer.ReceivedPower = 0;
-            _consumersByPriority[consumer.Priority].Remove(consumer);
-            _drawByPriority[consumer.Priority] -= consumer.DrawRate;
-            _powerNetManager.AddDirtyPowerNet(this);
-        }
-
-        public void UpdateConsumerDraw(PowerConsumerComponent consumer, int oldDrawRate, int newDrawRate)
-        {
-            Debug.Assert(_consumersByPriority[consumer.Priority].Contains(consumer));
-            _drawByPriority[consumer.Priority] -= oldDrawRate;
-            _drawByPriority[consumer.Priority] += newDrawRate;
-            _powerNetManager.AddDirtyPowerNet(this);
-        }
-
-        public void UpdateConsumerPriority(PowerConsumerComponent consumer, Priority oldPriority, Priority newPriority)
-        {
-            Debug.Assert(_consumersByPriority[oldPriority].Contains(consumer));
-            _consumersByPriority[oldPriority].Remove(consumer);
-            _drawByPriority[oldPriority] -= consumer.DrawRate;
-            _consumersByPriority[newPriority].Add(consumer);
-            _drawByPriority[newPriority] += consumer.DrawRate;
-            _powerNetManager.AddDirtyPowerNet(this);
-        }
-
-        public void UpdateConsumerReceivedPower()
-        {
-            var remainingSupply = _totalSupply;
-            foreach (var priority in CachedPriorities)
-            {
-                var categoryPowerDemand = _drawByPriority[priority];
-                if (remainingSupply >= categoryPowerDemand) //can fully power all in category
-                {
-                    remainingSupply -= categoryPowerDemand;
-                    foreach (var consumer in _consumersByPriority[priority])
-                    {
-                        consumer.ReceivedPower = consumer.DrawRate;
-                    }
-                }
-                else //cannot fully power all, split power
-                {
-                    var availiablePowerFraction = (float) remainingSupply / categoryPowerDemand;
-                    remainingSupply = 0;
-                    foreach (var consumer in _consumersByPriority[priority])
-                    {
-                        consumer.ReceivedPower = (int) (consumer.DrawRate * availiablePowerFraction); //give each consumer a fraction of what they requested (rounded down to nearest int)
-                    }
-                }
-            }
-        }
-
-        #endregion
-
-        private class NullPowerNet : IPowerNet
-        {
-            public void AddConsumer(PowerConsumerComponent consumer) { }
-            public void AddSupplier(PowerSupplierComponent supplier) { }
-            public void UpdateSupplierSupply(PowerSupplierComponent supplier, int oldSupplyRate, int newSupplyRate) { }
-            public void RemoveConsumer(PowerConsumerComponent consumer) { }
-            public void RemoveSupplier(PowerSupplierComponent supplier) { }
-            public void UpdateConsumerDraw(PowerConsumerComponent consumer, int oldDrawRate, int newDrawRate) { }
-            public void UpdateConsumerPriority(PowerConsumerComponent consumer, Priority oldPriority, Priority newPriority) { }
-            public void UpdateConsumerReceivedPower() { }
-        }
-    }
-}

Content.Server/NodeContainer/Nodes/AdjacentNode.cs

@@ -1,5 +1,6 @@
 #nullable enable
 using System.Collections.Generic;
+using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Map;
 using Robust.Shared.Serialization.Manager.Attributes;
@@ -12,29 +13,19 @@ namespace Content.Server.NodeContainer.Nodes
     [DataDefinition]
     public class AdjacentNode : Node
     {
-        protected override IEnumerable<Node> GetReachableNodes()
+        public override IEnumerable<Node> GetReachableNodes()
         {
             if (!Owner.Transform.Anchored)
                 yield break;
 
+            var compMgr = IoCManager.Resolve<IComponentManager>();
             var grid = IoCManager.Resolve<IMapManager>().GetGrid(Owner.Transform.GridID);
-            var coords = Owner.Transform.Coordinates;
-            foreach (var cell in grid.GetCardinalNeighborCells(coords))
+            var gridIndex = grid.TileIndicesFor(Owner.Transform.Coordinates);
+
+            foreach (var (_, node) in NodeHelpers.GetCardinalNeighborNodes(compMgr, grid, gridIndex))
             {
-                foreach (var entity in grid.GetLocal(Owner.EntityManager.GetEntity(cell).Transform.Coordinates))
-                {
-                    if (!Owner.EntityManager.GetEntity(entity).TryGetComponent<NodeContainerComponent>(out var container))
-                        continue;
-
-                    foreach (var node in container.Nodes.Values)
-                    {
-                        if (node != null && node != this)
-                        {
-                            yield return node;
-                        }
-                    }
-
-                }
+                if (node != this)
+                    yield return node;
             }
         }
     }

Content.Server/NodeContainer/Nodes/Node.cs

@@ -1,11 +1,8 @@
 #nullable enable
 using System.Collections.Generic;
-using System.Diagnostics;
-using System.Linq;
+using Content.Server.NodeContainer.EntitySystems;
 using Content.Server.NodeContainer.NodeGroups;
 using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
-using Robust.Shared.Physics;
 using Robust.Shared.Serialization.Manager.Attributes;
 using Robust.Shared.ViewVariables;
 
@@ -26,20 +23,14 @@ namespace Content.Server.NodeContainer.Nodes
         [DataField("nodeGroupID")]
         public NodeGroupID NodeGroupID { get; private set; } = NodeGroupID.Default;
 
-        [ViewVariables]
-        public INodeGroup NodeGroup { get => _nodeGroup; set => SetNodeGroup(value); }
-        private INodeGroup _nodeGroup = BaseNodeGroup.NullGroup;
+        [ViewVariables] public INodeGroup? NodeGroup;
 
-        [ViewVariables]
-        public IEntity Owner { get; private set; } = default!;
-
-        [ViewVariables]
-        private bool _needsGroup = true;
+        [ViewVariables] public IEntity Owner { get; private set; } = default!;
 
         /// <summary>
         ///     If this node should be considered for connection by other nodes.
         /// </summary>
-        public bool Connectable => !_deleting && Anchored;
+        public bool Connectable => !Deleting && Anchored;
 
         protected bool Anchored => !NeedAnchored || Owner.Transform.Anchored;
 
@@ -50,7 +41,15 @@ namespace Content.Server.NodeContainer.Nodes
         /// <summary>
         ///    Prevents a node from being used by other nodes while midway through removal.
         /// </summary>
-        private bool _deleting;
+        public bool Deleting;
+
+        public readonly HashSet<Node> ReachableNodes = new();
+
+        internal int FloodGen;
+        internal int UndirectGen;
+        internal bool FlaggedForFlood;
+        internal int NetId;
+        public string Name = default!;
 
         public virtual void Initialize(IEntity owner)
         {
@@ -59,20 +58,23 @@ namespace Content.Server.NodeContainer.Nodes
 
         public virtual void OnContainerStartup()
         {
-            TryAssignGroupIfNeeded();
-            CombineGroupWithReachable();
+            EntitySystem.Get<NodeGroupSystem>().QueueReflood(this);
+        }
+
+        public void CreateSingleNetImmediate()
+        {
+            EntitySystem.Get<NodeGroupSystem>().CreateSingleNetImmediate(this);
         }
 
         public void AnchorUpdate()
         {
             if (Anchored)
             {
-                TryAssignGroupIfNeeded();
-                CombineGroupWithReachable();
+                EntitySystem.Get<NodeGroupSystem>().QueueReflood(this);
             }
             else
             {
-                RemoveSelfFromGroup();
+                EntitySystem.Get<NodeGroupSystem>().QueueNodeRemove(this);
             }
         }
 
@@ -80,107 +82,21 @@ namespace Content.Server.NodeContainer.Nodes
         {
         }
 
+        public virtual void OnPostRebuild()
+        {
+
+        }
+
         public virtual void OnContainerShutdown()
         {
-            _deleting = true;
-            NodeGroup.RemoveNode(this);
-        }
-
-        public bool TryAssignGroupIfNeeded()
-        {
-            if (!_needsGroup || !Connectable)
-            {
-                return false;
-            }
-            NodeGroup = GetReachableCompatibleGroups().FirstOrDefault() ?? MakeNewGroup();
-            return true;
-        }
-
-        public void SpreadGroup()
-        {
-            Debug.Assert(!_needsGroup);
-            foreach (var node in GetReachableCompatibleNodes())
-            {
-                if (node._needsGroup)
-                {
-                    node.NodeGroup = NodeGroup;
-                    node.SpreadGroup();
-                }
-            }
-        }
-
-        public void ClearNodeGroup()
-        {
-            _nodeGroup = BaseNodeGroup.NullGroup;
-            _needsGroup = true;
-        }
-
-        protected void RefreshNodeGroup()
-        {
-            RemoveSelfFromGroup();
-            TryAssignGroupIfNeeded();
-            CombineGroupWithReachable();
+            Deleting = true;
+            EntitySystem.Get<NodeGroupSystem>().QueueNodeRemove(this);
         }
 
         /// <summary>
         ///     How this node will attempt to find other reachable <see cref="Node"/>s to group with.
         ///     Returns a set of <see cref="Node"/>s to consider grouping with. Should not return this current <see cref="Node"/>.
         /// </summary>
-        protected abstract IEnumerable<Node> GetReachableNodes();
-
-        private IEnumerable<Node> GetReachableCompatibleNodes()
-        {
-            foreach (var node in GetReachableNodes())
-            {
-                if (node.NodeGroupID == NodeGroupID && node.Connectable)
-                {
-                    yield return node;
-                }
-            }
-        }
-
-        private IEnumerable<INodeGroup> GetReachableCompatibleGroups()
-        {
-            foreach (var node in GetReachableCompatibleNodes())
-            {
-                if (!node._needsGroup)
-                {
-                    var group = node.NodeGroup;
-                    if (group != NodeGroup)
-                    {
-                        yield return group;
-                    }
-                }
-            }
-        }
-
-        private void CombineGroupWithReachable()
-        {
-            if (_needsGroup || !Connectable)
-                return;
-
-            foreach (var group in GetReachableCompatibleGroups())
-            {
-                NodeGroup.CombineGroup(group);
-            }
-        }
-
-        private void SetNodeGroup(INodeGroup newGroup)
-        {
-            _nodeGroup = newGroup;
-            NodeGroup.AddNode(this);
-            _needsGroup = false;
-        }
-
-        private INodeGroup MakeNewGroup()
-        {
-            return IoCManager.Resolve<INodeGroupFactory>().MakeNodeGroup(this);
-        }
-
-        private void RemoveSelfFromGroup()
-        {
-            NodeGroup.RemoveNode(this);
-            ClearNodeGroup();
-        }
+        public abstract IEnumerable<Node> GetReachableNodes();
     }
 }

Content.Server/NodeContainer/Nodes/NodeHelpers.cs

@@ -0,0 +1,89 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+
+namespace Content.Server.NodeContainer.Nodes
+{
+    /// <summary>
+    ///     Helper utilities for implementing <see cref="Node"/>.
+    /// </summary>
+    public static class NodeHelpers
+    {
+        public static IEnumerable<Node> GetNodesInTile(IComponentManager compMgr, IMapGrid grid, Vector2i coords)
+        {
+            foreach (var entityUid in grid.GetAnchoredEntities(coords))
+            {
+                if (!compMgr.TryGetComponent(entityUid, out NodeContainerComponent? container))
+                    continue;
+
+                foreach (var node in container.Nodes.Values)
+                {
+                    yield return node;
+                }
+            }
+        }
+
+        public static IEnumerable<(Direction dir, Node node)> GetCardinalNeighborNodes(
+            IComponentManager compMgr,
+            IMapGrid grid,
+            Vector2i coords,
+            bool includeSameTile = true)
+        {
+            foreach (var (dir, entityUid) in GetCardinalNeighborCells(grid, coords, includeSameTile))
+            {
+                if (!compMgr.TryGetComponent(entityUid, out NodeContainerComponent? container))
+                    continue;
+
+                foreach (var node in container.Nodes.Values)
+                {
+                    yield return (dir, node);
+                }
+            }
+        }
+
+        [SuppressMessage("ReSharper", "EnforceForeachStatementBraces")]
+        public static IEnumerable<(Direction dir, EntityUid entity)> GetCardinalNeighborCells(
+            IMapGrid grid,
+            Vector2i coords,
+            bool includeSameTile = true)
+        {
+            if (includeSameTile)
+            {
+                foreach (var uid in grid.GetAnchoredEntities(coords))
+                    yield return (Direction.Invalid, uid);
+            }
+
+            foreach (var uid in grid.GetAnchoredEntities(coords + (0, 1)))
+                yield return (Direction.North, uid);
+
+            foreach (var uid in grid.GetAnchoredEntities(coords + (0, -1)))
+                yield return (Direction.South, uid);
+
+            foreach (var uid in grid.GetAnchoredEntities(coords + (1, 0)))
+                yield return (Direction.East, uid);
+
+            foreach (var uid in grid.GetAnchoredEntities(coords + (-1, 0)))
+                yield return (Direction.West, uid);
+        }
+
+        public static Vector2i TileOffsetForDir(Direction dir)
+        {
+            return dir switch
+            {
+                Direction.Invalid => (0, 0),
+                Direction.South => (0, -1),
+                Direction.SouthEast => (1, -1),
+                Direction.East => (1, 0),
+                Direction.NorthEast => (1, 1),
+                Direction.North => (0, 1),
+                Direction.NorthWest => (-1, 1),
+                Direction.West => (-1, 0),
+                Direction.SouthWest => (-1, -1),
+                _ => throw new ArgumentOutOfRangeException(nameof(dir), dir, null)
+            };
+        }
+    }
+}

Content.Server/NodeContainer/Nodes/PipeNode.cs

@@ -3,9 +3,8 @@ using System.Collections.Generic;
 using Content.Server.Atmos;
 using Content.Server.Atmos.EntitySystems;
 using Content.Server.Interfaces;
-using Content.Server.NodeContainer;
+using Content.Server.NodeContainer.EntitySystems;
 using Content.Server.NodeContainer.NodeGroups;
-using Content.Server.NodeContainer.Nodes;
 using Content.Shared.Atmos;
 using Robust.Server.GameObjects;
 using Robust.Shared.Containers;
@@ -13,9 +12,10 @@ using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Map;
 using Robust.Shared.Serialization.Manager.Attributes;
+using Robust.Shared.Utility;
 using Robust.Shared.ViewVariables;
 
-namespace Content.Server.GameObjects.Components.NodeContainer.Nodes
+namespace Content.Server.NodeContainer.Nodes
 {
     /// <summary>
     ///     Connects with other <see cref="PipeNode"/>s whose <see cref="PipeDirection"/>
@@ -63,21 +63,23 @@ namespace Content.Server.GameObjects.Components.NodeContainer.Nodes
             set
             {
                 _connectionsEnabled = value;
-                RefreshNodeGroup();
+
+                if (NodeGroup != null)
+                    EntitySystem.Get<NodeGroupSystem>().QueueRemakeGroup((BaseNodeGroup) NodeGroup);
             }
         }
 
+        [DataField("connectionsEnabled")]
+        private bool _connectionsEnabled = true;
+
         [DataField("rotationsEnabled")]
         public bool RotationsEnabled { get; set; } = true;
 
         /// <summary>
-        ///     The <see cref="IPipeNet"/> this pipe is a part of. Set to <see cref="PipeNet.NullNet"/> when not in an <see cref="IPipeNet"/>.
+        ///     The <see cref="IPipeNet"/> this pipe is a part of.
         /// </summary>
         [ViewVariables]
-        private IPipeNet _pipeNet = PipeNet.NullNet;
-
-        [DataField("connectionsEnabled")]
-        private bool _connectionsEnabled = true;
+        private IPipeNet? PipeNet => (IPipeNet?) NodeGroup;
 
         /// <summary>
         ///     Whether to ignore the pipenet and return the environment's air.
@@ -92,8 +94,12 @@ namespace Content.Server.GameObjects.Components.NodeContainer.Nodes
         [ViewVariables]
         public GasMixture Air
         {
-            get => !EnvironmentalAir ? _pipeNet.Air : Owner.Transform.Coordinates.GetTileAir() ?? GasMixture.SpaceGas;
-            set => _pipeNet.Air = value;
+            get => (!EnvironmentalAir ? PipeNet?.Air : Owner.Transform.Coordinates.GetTileAir()) ?? GasMixture.SpaceGas;
+            set
+            {
+                DebugTools.Assert(PipeNet != null);
+                PipeNet!.Air = value;
+            }
         }
 
         public void AssumeAir(GasMixture giver)
@@ -105,7 +111,7 @@ namespace Content.Server.GameObjects.Components.NodeContainer.Nodes
                 return;
             }
 
-            EntitySystem.Get<AtmosphereSystem>().Merge(_pipeNet.Air, giver);
+            EntitySystem.Get<AtmosphereSystem>().Merge(PipeNet!.Air, giver);
         }
 
         [ViewVariables]
@@ -128,13 +134,6 @@ namespace Content.Server.GameObjects.Components.NodeContainer.Nodes
 
         public void JoinPipeNet(IPipeNet pipeNet)
         {
-            _pipeNet = pipeNet;
-            OnConnectedDirectionsNeedsUpdating();
-        }
-
-        public void ClearPipeNet()
-        {
-            _pipeNet = PipeNet.NullNet;
             OnConnectedDirectionsNeedsUpdating();
         }
 
@@ -146,12 +145,11 @@ namespace Content.Server.GameObjects.Components.NodeContainer.Nodes
             if (!RotationsEnabled) return;
             var diff = ev.NewRotation - ev.OldRotation;
             PipeDirection = PipeDirection.RotatePipeDirection(diff);
-            RefreshNodeGroup();
             OnConnectedDirectionsNeedsUpdating();
             UpdateAppearance();
         }
 
-        protected override IEnumerable<Node> GetReachableNodes()
+        public override IEnumerable<Node> GetReachableNodes()
         {
             for (var i = 0; i < PipeDirectionHelpers.AllPipeDirections; i++)
             {

Content.Server/ParticleAccelerator/Components/ParticleAcceleratorControlBoxComponent.cs

@@ -6,9 +6,10 @@ using System.Diagnostics.CodeAnalysis;
 using System.Threading;
 using Content.Server.Notification;
 using Content.Server.Power.Components;
+using Content.Server.Power.EntitySystems;
 using Content.Server.UserInterface;
 using Content.Server.VendingMachines;
-using Content.Server.Wires.Components;
+using Content.Server.WireHacking;
 using Content.Shared.ActionBlocker;
 using Content.Shared.Interaction;
 using Content.Shared.Interaction.Events;
@@ -47,7 +48,7 @@ namespace Content.Server.ParticleAccelerator.Components
         /// <summary>
         ///     Power receiver for the control console itself.
         /// </summary>
-        [ViewVariables] private PowerReceiverComponent _powerReceiverComponent = default!;
+        [ViewVariables] private ApcPowerReceiverComponent _apcPowerReceiverComponent = default!;
 
         [ViewVariables] private ParticleAcceleratorFuelChamberComponent? _partFuelChamber;
         [ViewVariables] private ParticleAcceleratorEndCapComponent? _partEndCap;
@@ -88,7 +89,7 @@ namespace Content.Server.ParticleAccelerator.Components
         [ViewVariables(VVAccess.ReadWrite)] [DataField("powerDrawBase")] private int _powerDrawBase = 500;
         [ViewVariables(VVAccess.ReadWrite)] [DataField("powerDrawMult")] private int _powerDrawMult = 1500;
 
-        [ViewVariables] private bool ConsolePowered => _powerReceiverComponent?.Powered ?? true;
+        [ViewVariables] private bool ConsolePowered => _apcPowerReceiverComponent?.Powered ?? true;
 
         public ParticleAcceleratorControlBoxComponent()
         {
@@ -107,9 +108,9 @@ namespace Content.Server.ParticleAccelerator.Components
                 UserInterface.OnReceiveMessage += UserInterfaceOnOnReceiveMessage;
             }
 
-            Owner.EnsureComponent(out _powerReceiverComponent);
+            Owner.EnsureComponent(out _apcPowerReceiverComponent);
 
-            _powerReceiverComponent!.Load = 250;
+            _apcPowerReceiverComponent!.Load = 250;
         }
 
         public override void HandleMessage(ComponentMessage message, IComponent? component)
@@ -189,8 +190,8 @@ namespace Content.Server.ParticleAccelerator.Components
 
         public void UpdateUI()
         {
-            var draw = 0;
-            var receive = 0;
+            var draw = 0f;
+            var receive = 0f;
 
             if (_isEnabled)
             {
@@ -202,8 +203,8 @@ namespace Content.Server.ParticleAccelerator.Components
                 _isAssembled,
                 _isEnabled,
                 _selectedStrength,
-                draw,
-                receive,
+                (int) draw,
+                (int) receive,
                 _partEmitterLeft != null,
                 _partEmitterCenter != null,
                 _partEmitterRight != null,
@@ -577,7 +578,7 @@ namespace Content.Server.ParticleAccelerator.Components
             if (Owner.TryGetComponent(out AppearanceComponent? appearance))
             {
                 appearance.SetData(ParticleAcceleratorVisuals.VisualState,
-                    _powerReceiverComponent!.Powered
+                    _apcPowerReceiverComponent!.Powered
                         ? (ParticleAcceleratorVisualState) _selectedStrength
                         : ParticleAcceleratorVisualState.Unpowered);
             }
@@ -645,7 +646,7 @@ namespace Content.Server.ParticleAccelerator.Components
             } * _powerDrawMult + _powerDrawBase;
         }
 
-        public void PowerBoxReceivedChanged(object? sender, ReceivedPowerChangedEventArgs eventArgs)
+        public void PowerBoxReceivedChanged(PowerConsumerReceivedChanged eventArgs)
         {
             DebugTools.Assert(_isAssembled);
 

Content.Server/ParticleAccelerator/Components/ParticleAcceleratorPowerBoxComponent.cs

@@ -17,12 +17,6 @@ namespace Content.Server.ParticleAccelerator.Components
             base.Initialize();
 
             PowerConsumerComponent = Owner.EnsureComponentWarn<PowerConsumerComponent>();
-            PowerConsumerComponent.OnReceivedPowerChanged += PowerReceivedChanged;
-        }
-
-        private void PowerReceivedChanged(object? sender, ReceivedPowerChangedEventArgs e)
-        {
-            Master?.PowerBoxReceivedChanged(sender, e);
         }
     }
 }

Content.Server/ParticleAccelerator/EntitySystems/ParticleAcceleratorPartSystem.cs

@@ -3,7 +3,7 @@ using Content.Server.ParticleAccelerator.Components;
 using JetBrains.Annotations;
 using Robust.Shared.GameObjects;
 
-namespace Content.Server.ParticleAccelerator
+namespace Content.Server.ParticleAccelerator.EntitySystems
 {
     [UsedImplicitly]
     public class ParticleAcceleratorPartSystem : EntitySystem

Content.Server/ParticleAccelerator/EntitySystems/ParticleAcceleratorPowerBoxSystem.cs

@@ -0,0 +1,27 @@
+using Content.Server.ParticleAccelerator.Components;
+using Content.Server.Power.EntitySystems;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.ParticleAccelerator.EntitySystems
+{
+    [UsedImplicitly]
+    public class ParticleAcceleratorPowerBoxSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            SubscribeLocalEvent<ParticleAcceleratorPowerBoxComponent, PowerConsumerReceivedChanged>(
+                PowerBoxReceivedChanged);
+        }
+
+        private static void PowerBoxReceivedChanged(
+            EntityUid uid,
+            ParticleAcceleratorPowerBoxComponent component,
+            PowerConsumerReceivedChanged args)
+        {
+            component.Master!.PowerBoxReceivedChanged(args);
+        }
+    }
+}

Content.Server/Power/Commands/PowerStatCommand.cs

@@ -0,0 +1,26 @@
+using Content.Server.Administration;
+using Content.Server.Power.EntitySystems;
+using Content.Shared.Administration;
+using Robust.Shared.Console;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Power.Commands
+{
+    [AdminCommand(AdminFlags.Debug)]
+    public sealed class PowerStatCommand : IConsoleCommand
+    {
+        public string Command => "powerstat";
+        public string Description => "Shows statistics for pow3r";
+        public string Help => "Usage: powerstat";
+
+        public void Execute(IConsoleShell shell, string argStr, string[] args)
+        {
+            var stats = EntitySystem.Get<PowerNetSystem>().GetStatistics();
+
+            shell.WriteLine($"networks: {stats.CountNetworks}");
+            shell.WriteLine($"loads: {stats.CountLoads}");
+            shell.WriteLine($"supplies: {stats.CountSupplies}");
+            shell.WriteLine($"batteries: {stats.CountBatteries}");
+        }
+    }
+}

Content.Server/Power/Components/ApcComponent.cs

@@ -1,23 +1,22 @@
 #nullable enable
 using System;
 using Content.Server.Access.Components;
-using Content.Server.Battery.Components;
-using Content.Server.Power.Components;
+using Content.Server.Power.NodeGroups;
 using Content.Server.UserInterface;
 using Content.Shared.APC;
 using Content.Shared.Interaction;
-using Content.Shared.Notification;
 using Content.Shared.Notification.Managers;
 using Robust.Server.GameObjects;
 using Robust.Shared.Audio;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Localization;
+using Robust.Shared.Maths;
 using Robust.Shared.Player;
 using Robust.Shared.Timing;
 using Robust.Shared.ViewVariables;
 
-namespace Content.Server.APC.Components
+namespace Content.Server.Power.Components
 {
     [RegisterComponent]
     [ComponentReference(typeof(IActivate))]
@@ -57,7 +56,6 @@ namespace Content.Server.APC.Components
         {
             base.Initialize();
 
-            Owner.EnsureComponent<PowerConsumerComponent>();
             Owner.EnsureComponentWarn<ServerUserInterfaceComponent>();
             Owner.EnsureComponentWarn<AccessReader>();
 
@@ -89,6 +87,8 @@ namespace Content.Server.APC.Components
                 if (_accessReader == null || _accessReader.IsAllowed(user))
                 {
                     MainBreakerEnabled = !MainBreakerEnabled;
+                    Owner.GetComponent<PowerNetworkBatteryComponent>().CanDischarge = MainBreakerEnabled;
+
                     _uiDirty = true;
                     SoundSystem.Play(Filter.Pvs(Owner), "/Audio/Machines/machine_switch.ogg", Owner, AudioParams.Default.WithVolume(-2f));
                 }
@@ -153,44 +153,31 @@ namespace Content.Server.APC.Components
                 return ApcChargeState.Full;
             }
 
-            if (!Owner.TryGetComponent(out PowerConsumerComponent? consumer))
-            {
-                return ApcChargeState.Full;
-            }
+            var netBattery = Owner.GetComponent<PowerNetworkBatteryComponent>();
+            var delta = netBattery.CurrentSupply - netBattery.CurrentReceiving;
 
-            if (consumer.DrawRate == consumer.ReceivedPower)
-            {
-                return ApcChargeState.Charging;
-            }
-            else
-            {
-                return ApcChargeState.Lack;
-            }
+            return delta < 0 ? ApcChargeState.Charging : ApcChargeState.Lack;
         }
 
         private ApcExternalPowerState CalcExtPowerState()
         {
-            if (!Owner.TryGetComponent(out BatteryStorageComponent? batteryStorage))
+            var bat = Battery;
+            if (bat == null)
+                return ApcExternalPowerState.None;
+
+            var netBat = Owner.GetComponent<PowerNetworkBatteryComponent>();
+            if (netBat.CurrentReceiving == 0 && netBat.LoadingNetworkDemand != 0)
             {
                 return ApcExternalPowerState.None;
             }
-            var consumer = batteryStorage.Consumer;
 
-            if (consumer == null)
-                return ApcExternalPowerState.None;
-
-            if (consumer.ReceivedPower == 0 && consumer.DrawRate != 0)
-            {
-                return ApcExternalPowerState.None;
-            }
-            else if (consumer.ReceivedPower < consumer.DrawRate)
+            var delta = netBat.CurrentReceiving - netBat.LoadingNetworkDemand;
+            if (!MathHelper.CloseTo(delta, 0, 0.1f) && delta < 0)
             {
                 return ApcExternalPowerState.Low;
             }
-            else
-            {
-                return ApcExternalPowerState.Good;
-            }
+
+            return ApcExternalPowerState.Good;
         }
 
         void IActivate.Activate(ActivateEventArgs eventArgs)

Content.Server/Power/Components/ApcPowerProviderComponent.cs

@@ -0,0 +1,121 @@
+#nullable enable
+using System;
+using System.Collections.Generic;
+using Content.Server.Power.NodeGroups;
+using Robust.Shared.GameObjects;
+using Robust.Shared.IoC;
+using Robust.Shared.Serialization.Manager.Attributes;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Server.Power.Components
+{
+    [RegisterComponent]
+    public class ApcPowerProviderComponent : BaseApcNetComponent
+    {
+        public override string Name => "PowerProvider";
+
+        public IEntity ProviderOwner => Owner;
+
+        /// <summary>
+        ///     The max distance this can transmit power to <see cref="ApcPowerReceiverComponent"/>s from.
+        /// </summary>
+        [ViewVariables(VVAccess.ReadWrite)]
+        public int PowerTransferRange { get => _powerTransferRange; set => SetPowerTransferRange(value); }
+        [DataField("powerTransferRange")]
+        private int _powerTransferRange = 3;
+
+        [ViewVariables] public List<ApcPowerReceiverComponent> LinkedReceivers { get; } = new();
+
+        /// <summary>
+        ///     If <see cref="ApcPowerReceiverComponent"/>s should consider connecting to this.
+        /// </summary>
+        [ViewVariables(VVAccess.ReadWrite)]
+        public bool Connectable { get; private set; } = true;
+
+        public void AddReceiver(ApcPowerReceiverComponent receiver)
+        {
+            LinkedReceivers.Add(receiver);
+            receiver.NetworkLoad.LinkedNetwork = default;
+
+            Net?.QueueNetworkReconnect();
+        }
+
+        public void RemoveReceiver(ApcPowerReceiverComponent receiver)
+        {
+            LinkedReceivers.Remove(receiver);
+            receiver.NetworkLoad.LinkedNetwork = default;
+
+            Net?.QueueNetworkReconnect();
+        }
+
+        protected override void Startup()
+        {
+            base.Startup();
+
+            foreach (var receiver in FindAvailableReceivers())
+            {
+                receiver.Provider = this;
+            }
+        }
+
+        protected override void OnRemove()
+        {
+            Connectable = false;
+            var receivers = LinkedReceivers.ToArray();
+            foreach (var receiver in receivers)
+            {
+                receiver.Provider = null;
+            }
+            foreach (var receiver in receivers)
+            {
+                receiver.TryFindAndSetProvider();
+            }
+            base.OnRemove();
+        }
+
+        private IEnumerable<ApcPowerReceiverComponent> FindAvailableReceivers()
+        {
+            var nearbyEntities = IoCManager.Resolve<IEntityLookup>()
+                .GetEntitiesInRange(Owner, PowerTransferRange);
+
+            foreach (var entity in nearbyEntities)
+            {
+                if (entity.TryGetComponent<ApcPowerReceiverComponent>(out var receiver) &&
+                    receiver.Connectable &&
+                    receiver.NeedsProvider &&
+                    receiver.Owner.Transform.Coordinates.TryDistance(Owner.EntityManager, Owner.Transform.Coordinates, out var distance) &&
+                    distance < Math.Min(PowerTransferRange, receiver.PowerReceptionRange))
+                {
+                    yield return receiver;
+                }
+            }
+        }
+
+        protected override void AddSelfToNet(IApcNet apcNet)
+        {
+            apcNet.AddPowerProvider(this);
+        }
+
+        protected override void RemoveSelfFromNet(IApcNet apcNet)
+        {
+            apcNet.RemovePowerProvider(this);
+        }
+
+        private void SetPowerTransferRange(int newPowerTransferRange)
+        {
+            var receivers = LinkedReceivers.ToArray();
+
+            foreach (var receiver in receivers)
+            {
+                receiver.Provider = null;
+            }
+
+            _powerTransferRange = newPowerTransferRange;
+
+            foreach (var receiver in receivers)
+            {
+                receiver.TryFindAndSetProvider();
+            }
+        }
+    }
+}

Content.Server/Power/Components/ApcPowerReceiverComponent.cs

@@ -1,12 +1,15 @@
 #nullable enable
 using System;
-using Content.Server.APC;
+using System.Diagnostics.CodeAnalysis;
+using Content.Server.Power.NodeGroups;
+using Content.Server.Power.Pow3r;
 using Content.Shared.Examine;
 using Content.Shared.Power;
 using Robust.Server.GameObjects;
 using Robust.Shared.GameObjects;
 using Robust.Shared.IoC;
 using Robust.Shared.Localization;
+using Robust.Shared.Maths;
 using Robust.Shared.Physics;
 using Robust.Shared.Serialization.Manager.Attributes;
 using Robust.Shared.Utility;
@@ -15,26 +18,21 @@ using Robust.Shared.ViewVariables;
 namespace Content.Server.Power.Components
 {
     /// <summary>
-    ///     Attempts to link with a nearby <see cref="IPowerProvider"/>s so that it can receive power from a <see cref="IApcNet"/>.
+    ///     Attempts to link with a nearby <see cref="ApcPowerProviderComponent"/>s
+    ///     so that it can receive power from a <see cref="IApcNet"/>.
     /// </summary>
     [RegisterComponent]
-    public class PowerReceiverComponent : Component, IExamine
+    public class ApcPowerReceiverComponent : Component, IExamine
     {
         [ViewVariables] [ComponentDependency] private readonly IPhysBody? _physicsComponent = null;
 
-        public override string Name => "PowerReceiver";
+        public override string Name => "ApcPowerReceiver";
 
         [ViewVariables]
-        public bool Powered => (HasApcPower || !NeedsPower) && !PowerDisabled;
+        public bool Powered => (MathHelper.CloseTo(NetworkLoad.ReceivingPower, Load) || !NeedsPower) && !PowerDisabled;
 
         /// <summary>
-        ///     If this is being powered by an Apc.
-        /// </summary>
-        [ViewVariables]
-        public bool HasApcPower { get; private set; }
-
-        /// <summary>
-        ///     The max distance from a <see cref="PowerProviderComponent"/> that this can receive power from.
+        ///     The max distance from a <see cref="ApcPowerProviderComponent"/> that this can receive power from.
         /// </summary>
         [ViewVariables(VVAccess.ReadWrite)]
         public int PowerReceptionRange { get => _powerReceptionRange; set => SetPowerReceptionRange(value); }
@@ -42,32 +40,53 @@ namespace Content.Server.Power.Components
         private int _powerReceptionRange = 3;
 
         [ViewVariables]
-        public IPowerProvider Provider { get => _provider; set => SetProvider(value); }
-        private IPowerProvider _provider = PowerProviderComponent.NullProvider;
+        public ApcPowerProviderComponent? Provider
+        {
+            get => _provider;
+            set
+            {
+                // Will get updated before power networks process.
+                NetworkLoad.LinkedNetwork = default;
+                _provider?.RemoveReceiver(this);
+                _provider = value;
+                value?.AddReceiver(this);
+                ApcPowerChanged();
+            }
+        }
+
+        private ApcPowerProviderComponent? _provider;
 
         /// <summary>
-        ///     If this should be considered for connection by <see cref="PowerProviderComponent"/>s.
+        ///     If this should be considered for connection by <see cref="ApcPowerProviderComponent"/>s.
         /// </summary>
         public bool Connectable => Anchored;
 
         private bool Anchored => _physicsComponent == null || _physicsComponent.BodyType == BodyType.Static;
 
-        [ViewVariables]
-        public bool NeedsProvider { get; private set; } = true;
+        [ViewVariables] public bool NeedsProvider => Provider == null;
 
         /// <summary>
         ///     Amount of charge this needs from an APC per second to function.
         /// </summary>
         [ViewVariables(VVAccess.ReadWrite)]
-        public int Load { get => _load; set => SetLoad(value); }
         [DataField("powerLoad")]
-        private int _load = 5;
+        public float Load { get => NetworkLoad.DesiredPower; set => NetworkLoad.DesiredPower = value; }
 
         /// <summary>
         ///     When false, causes this to appear powered even if not receiving power from an Apc.
         /// </summary>
         [ViewVariables(VVAccess.ReadWrite)]
-        public bool NeedsPower { get => _needsPower; set => SetNeedsPower(value); }
+        public bool NeedsPower
+        {
+            get => _needsPower;
+            set
+            {
+                _needsPower = value;
+                // Reset this so next tick will do a power update.
+                LastPowerReceived = float.NaN;
+            }
+        }
+
         [DataField("needsPower")]
         private bool _needsPower = true;
 
@@ -75,9 +94,16 @@ namespace Content.Server.Power.Components
         ///     When true, causes this to never appear powered.
         /// </summary>
         [ViewVariables(VVAccess.ReadWrite)]
-        public bool PowerDisabled { get => _powerDisabled; set => SetPowerDisabled(value); }
         [DataField("powerDisabled")]
-        private bool _powerDisabled;
+        public bool PowerDisabled { get => !NetworkLoad.Enabled; set => NetworkLoad.Enabled = !value; }
+
+        public float LastPowerReceived = float.NaN;
+
+        [ViewVariables]
+        public PowerState.Load NetworkLoad { get; } = new PowerState.Load
+        {
+            DesiredPower = 5
+        };
 
         protected override void Startup()
         {
@@ -94,7 +120,8 @@ namespace Content.Server.Power.Components
 
         protected override void OnRemove()
         {
-            _provider.RemoveReceiver(this);
+            _provider?.RemoveReceiver(this);
+
             base.OnRemove();
         }
 
@@ -108,20 +135,17 @@ namespace Content.Server.Power.Components
 
         public void ApcPowerChanged()
         {
-            var oldPowered = Powered;
-            HasApcPower = Provider.HasApcPower;
-            if (Powered != oldPowered)
-                OnNewPowerState();
+            OnNewPowerState();
         }
 
-        private bool TryFindAvailableProvider(out IPowerProvider foundProvider)
+        private bool TryFindAvailableProvider([NotNullWhen(true)] out ApcPowerProviderComponent? foundProvider)
         {
             var nearbyEntities = IoCManager.Resolve<IEntityLookup>()
                 .GetEntitiesInRange(Owner, PowerReceptionRange);
 
             foreach (var entity in nearbyEntities)
             {
-                if (entity.TryGetComponent<PowerProviderComponent>(out var provider))
+                if (entity.TryGetComponent<ApcPowerProviderComponent>(out var provider))
                 {
                     if (provider.Connectable)
                     {
@@ -136,60 +160,18 @@ namespace Content.Server.Power.Components
                     }
                 }
             }
-            foundProvider = default!;
+
+            foundProvider = default;
             return false;
         }
 
-        public void ClearProvider()
-        {
-            _provider.RemoveReceiver(this);
-            _provider = PowerProviderComponent.NullProvider;
-            NeedsProvider = true;
-            ApcPowerChanged();
-        }
-
-        private void SetProvider(IPowerProvider newProvider)
-        {
-            _provider.RemoveReceiver(this);
-            _provider = newProvider;
-            newProvider.AddReceiver(this);
-            NeedsProvider = false;
-            ApcPowerChanged();
-        }
-
         private void SetPowerReceptionRange(int newPowerReceptionRange)
         {
-            ClearProvider();
+            Provider = null;
             _powerReceptionRange = newPowerReceptionRange;
             TryFindAndSetProvider();
         }
 
-        private void SetLoad(int newLoad)
-        {
-            Provider.UpdateReceiverLoad(Load, newLoad);
-            _load = newLoad;
-        }
-
-        private void SetNeedsPower(bool newNeedsPower)
-        {
-            var oldPowered = Powered;
-            _needsPower = newNeedsPower;
-            if (oldPowered != Powered)
-            {
-                OnNewPowerState();
-            }
-        }
-
-        private void SetPowerDisabled(bool newPowerDisabled)
-        {
-            var oldPowered = Powered;
-            _powerDisabled = newPowerDisabled;
-            if (oldPowered != Powered)
-            {
-                OnNewPowerState();
-            }
-        }
-
         private void OnNewPowerState()
         {
             SendMessage(new PowerChangedMessage(Powered));
@@ -211,7 +193,7 @@ namespace Content.Server.Power.Components
             }
             else
             {
-                ClearProvider();
+                Provider = null;
             }
         }
 

Content.Server/Power/Components/BaseApcNetComponent.cs

@@ -0,0 +1,9 @@
+#nullable enable
+using Content.Server.Power.NodeGroups;
+
+namespace Content.Server.Power.Components
+{
+    public abstract class BaseApcNetComponent : BaseNetConnectorComponent<IApcNet>
+    {
+    }
+}

Content.Server/Power/Components/BaseCharger.cs

@@ -1,7 +1,6 @@
 #nullable enable
 using System;
 using System.Threading.Tasks;
-using Content.Server.Battery.Components;
 using Content.Server.Hands.Components;
 using Content.Server.Items;
 using Content.Server.Weapon.Ranged.Barrels.Components;
@@ -45,7 +44,7 @@ namespace Content.Server.Power.Components
         {
             base.Initialize();
 
-            Owner.EnsureComponent<PowerReceiverComponent>();
+            Owner.EnsureComponent<ApcPowerReceiverComponent>();
             _container = ContainerHelpers.EnsureContainer<ContainerSlot>(Owner, $"{Name}-powerCellContainer");
             // Default state in the visualizer is OFF, so when this gets powered on during initialization it will generally show empty
         }
@@ -191,7 +190,7 @@ namespace Content.Server.Power.Components
 
         private CellChargerStatus GetStatus()
         {
-            if (Owner.TryGetComponent(out PowerReceiverComponent? receiver) &&
+            if (Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) &&
                 !receiver.Powered)
             {
                 return CellChargerStatus.Off;
@@ -234,7 +233,7 @@ namespace Content.Server.Power.Components
             // Not called UpdateAppearance just because it messes with the load
             var status = GetStatus();
             if (_status == status ||
-                !Owner.TryGetComponent(out PowerReceiverComponent? receiver))
+                !Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver))
             {
                 return;
             }
@@ -279,7 +278,7 @@ namespace Content.Server.Power.Components
 
         private void TransferPower(float frameTime)
         {
-            if (Owner.TryGetComponent(out PowerReceiverComponent? receiver) &&
+            if (Owner.TryGetComponent(out ApcPowerReceiverComponent? receiver) &&
                 !receiver.Powered)
             {
                 return;

Content.Server/Power/Components/BaseNetConnectorComponent.cs

@@ -17,23 +17,18 @@ namespace Content.Server.Power.Components
         private Voltage _voltage = Voltage.High;
 
         [ViewVariables]
-        public TNetType Net { get => _net; set => SetNet(value); }
-        private TNetType _net = default!; //set in OnAdd()
-
-        protected abstract TNetType NullNet { get; }
+        public TNetType? Net { get => _net; set => SetNet(value); }
+        private TNetType? _net;
 
         [ViewVariables]
-        private bool _needsNet = true;
+        private bool _needsNet => _net != null;
 
-        protected override void OnAdd()
-        {
-            base.OnAdd();
-            _net = NullNet;
-        }
+        [DataField("node")] [ViewVariables] public string? NodeId;
 
         protected override void Initialize()
         {
             base.Initialize();
+
             if (_needsNet)
             {
                 TryFindAndSetNet();
@@ -56,9 +51,8 @@ namespace Content.Server.Power.Components
 
         public void ClearNet()
         {
-            RemoveSelfFromNet(_net);
-            _net = NullNet;
-            _needsNet = true;
+            if (_net != null)
+                RemoveSelfFromNet(_net);
         }
 
         protected abstract void AddSelfToNet(TNetType net);
@@ -70,7 +64,7 @@ namespace Content.Server.Power.Components
             if (Owner.TryGetComponent<NodeContainerComponent>(out var container))
             {
                 var compatibleNet = container.Nodes.Values
-                    .Where(node => node.NodeGroupID == (NodeGroupID) Voltage)
+                    .Where(node => (NodeId == null || NodeId == node.Name) && node.NodeGroupID == (NodeGroupID) Voltage)
                     .Select(node => node.NodeGroup)
                     .OfType<TNetType>()
                     .FirstOrDefault();
@@ -85,12 +79,15 @@ namespace Content.Server.Power.Components
             return false;
         }
 
-        private void SetNet(TNetType newNet)
+        private void SetNet(TNetType? newNet)
         {
-            RemoveSelfFromNet(_net);
-            AddSelfToNet(newNet);
+            if (_net != null)
+                RemoveSelfFromNet(_net);
+
+            if (newNet != null)
+                AddSelfToNet(newNet);
+
             _net = newNet;
-            _needsNet = false;
         }
 
         private void SetVoltage(Voltage newVoltage)

Content.Server/Power/Components/BasePowerNetComponent.cs

@@ -1,10 +1,10 @@
 #nullable enable
 using Content.Server.NodeContainer.NodeGroups;
+using Content.Server.Power.NodeGroups;
 
 namespace Content.Server.Power.Components
 {
     public abstract class BasePowerNetComponent : BaseNetConnectorComponent<IPowerNet>
     {
-        protected override IPowerNet NullNet => PowerNetNodeGroup.NullNet;
     }
 }

Content.Server/Power/Components/BatteryChargerComponent.cs

@@ -0,0 +1,24 @@
+using Content.Server.Power.NodeGroups;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Power.Components
+{
+    /// <summary>
+    ///     Connects the loading side of a <see cref="BatteryComponent"/> to a non-APC power network.
+    /// </summary>
+    [RegisterComponent]
+    public class BatteryChargerComponent : BasePowerNetComponent
+    {
+        public override string Name => "BatteryCharger";
+
+        protected override void AddSelfToNet(IPowerNet net)
+        {
+            net.AddCharger(this);
+        }
+
+        protected override void RemoveSelfFromNet(IPowerNet net)
+        {
+            net.RemoveCharger(this);
+        }
+    }
+}