Raise power events by ref and not broadcast (#11923)

Also some other minor stuff.

Content.Server/AME/AntimatterEngineSystem.cs

@@ -47,7 +47,7 @@ namespace Content.Server.AME
             }
         }
 
-        private static void OnAMEPowerChange(EntityUid uid, AMEControllerComponent component, PowerChangedEvent args)
+        private static void OnAMEPowerChange(EntityUid uid, AMEControllerComponent component, ref PowerChangedEvent args)
         {
             component.UpdateUserInterface();
         }

Content.Server/Advertise/AdvertiseSystem.cs

@@ -34,7 +34,7 @@ namespace Content.Server.Advertise
             RefreshTimer(uid, true, advertise);
         }
 
-        private void OnPowerChanged(EntityUid uid, AdvertiseComponent advertise, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, AdvertiseComponent advertise, ref PowerChangedEvent args)
         {
             SetEnabled(uid, args.Powered, advertise);
         }

Content.Server/Arcade/ArcadeSystem.BlockGame.cs

@@ -10,7 +10,7 @@ public sealed partial class ArcadeSystem
         SubscribeLocalEvent<BlockGameArcadeComponent, PowerChangedEvent>(OnBlockPowerChanged);
     }
 
-    private static void OnBlockPowerChanged(EntityUid uid, BlockGameArcadeComponent component, PowerChangedEvent args)
+    private static void OnBlockPowerChanged(EntityUid uid, BlockGameArcadeComponent component, ref PowerChangedEvent args)
     {
         component.OnPowerStateChanged(args);
     }

Content.Server/Arcade/ArcadeSystem.SpaceVillain.cs

@@ -10,7 +10,7 @@ public sealed partial class ArcadeSystem
         SubscribeLocalEvent<SpaceVillainArcadeComponent, PowerChangedEvent>(OnSVillainPower);
     }
 
-    private void OnSVillainPower(EntityUid uid, SpaceVillainArcadeComponent component, PowerChangedEvent args)
+    private void OnSVillainPower(EntityUid uid, SpaceVillainArcadeComponent component, ref PowerChangedEvent args)
     {
         component.OnPowerStateChanged(args);
     }

Content.Server/Atmos/Monitor/Systems/AirAlarmSystem.cs

@@ -195,7 +195,7 @@ public sealed class AirAlarmSystem : EntitySystem
         UpdateUI(uid, component);
     }
 
-    private void OnPowerChanged(EntityUid uid, AirAlarmComponent component, PowerChangedEvent args)
+    private void OnPowerChanged(EntityUid uid, AirAlarmComponent component, ref PowerChangedEvent args)
     {
         if (args.Powered)
         {

Content.Server/Atmos/Monitor/Systems/AtmosAlarmableSystem.cs

@@ -56,7 +56,7 @@ public sealed class AtmosAlarmableSystem : EntitySystem
             false);
     }
 
-    private void OnPowerChange(EntityUid uid, AtmosAlarmableComponent component, PowerChangedEvent args)
+    private void OnPowerChange(EntityUid uid, AtmosAlarmableComponent component, ref PowerChangedEvent args)
     {
         if (!args.Powered)
         {

Content.Server/Atmos/Monitor/Systems/AtmosMonitoringSystem.cs

@@ -142,7 +142,7 @@ public sealed class AtmosMonitorSystem : EntitySystem
         }
     }
 
-    private void OnPowerChangedEvent(EntityUid uid, AtmosMonitorComponent component, PowerChangedEvent args)
+    private void OnPowerChangedEvent(EntityUid uid, AtmosMonitorComponent component, ref PowerChangedEvent args)
     {
         if (TryComp<AtmosDeviceComponent>(uid, out var atmosDeviceComponent))
         {

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

@@ -173,7 +173,7 @@ namespace Content.Server.Atmos.Piping.Unary.EntitySystems
             UpdateState(uid, component);
         }
 
-        private void OnPowerChanged(EntityUid uid, GasVentPumpComponent component, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, GasVentPumpComponent component, ref PowerChangedEvent args)
         {
             component.Enabled = args.Powered;
             UpdateState(uid, component);

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

@@ -138,7 +138,7 @@ namespace Content.Server.Atmos.Piping.Unary.EntitySystems
             UpdateState(uid, component);
         }
 
-        private void OnPowerChanged(EntityUid uid, GasVentScrubberComponent component, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, GasVentScrubberComponent component, ref PowerChangedEvent args)
         {
             component.Enabled = args.Powered;
             UpdateState(uid, component);

Content.Server/Atmos/Portable/PortableScrubberSystem.cs

@@ -104,7 +104,7 @@ namespace Content.Server.Atmos.Portable
 
             UpdateDrainingAppearance(uid, portableNode.ConnectionsEnabled);
         }
-        private void OnPowerChanged(EntityUid uid, PortableScrubberComponent component, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, PortableScrubberComponent component, ref PowerChangedEvent args)
         {
             UpdateAppearance(uid, component.Full, args.Powered);
             component.Enabled = args.Powered;

Content.Server/Audio/AmbientSoundSystem.cs

@@ -13,7 +13,7 @@ namespace Content.Server.Audio
             SubscribeLocalEvent<AmbientOnPoweredComponent, PowerNetBatterySupplyEvent>(HandlePowerSupply);
         }
 
-        private void HandlePowerSupply(EntityUid uid, AmbientOnPoweredComponent component, PowerNetBatterySupplyEvent args)
+        private void HandlePowerSupply(EntityUid uid, AmbientOnPoweredComponent component, ref PowerNetBatterySupplyEvent args)
         {
             if (!EntityManager.TryGetComponent<AmbientSoundComponent>(uid, out var ambientSound)) return;
             if (ambientSound.Enabled == args.Supply) return;
@@ -21,7 +21,7 @@ namespace Content.Server.Audio
             Dirty(ambientSound);
         }
 
-        private void HandlePowerChange(EntityUid uid, AmbientOnPoweredComponent component, PowerChangedEvent args)
+        private void HandlePowerChange(EntityUid uid, AmbientOnPoweredComponent component, ref PowerChangedEvent args)
         {
             if (!EntityManager.TryGetComponent<AmbientSoundComponent>(uid, out var ambientSound)) return;
             if (ambientSound.Enabled == args.Powered) return;

Content.Server/Bed/BedSystem.cs

@@ -106,7 +106,7 @@ namespace Content.Server.Bed
             RaiseLocalEvent(args.BuckledEntity, metabolicEvent, false);
         }
 
-        private void OnPowerChanged(EntityUid uid, StasisBedComponent component, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, StasisBedComponent component, ref PowerChangedEvent args)
         {
             UpdateAppearance(uid, args.Powered);
             UpdateMetabolisms(uid, component, args.Powered);

Content.Server/Cargo/Systems/CargoSystem.Telepad.cs

@@ -109,7 +109,7 @@ public sealed partial class CargoSystem
         appearance?.SetData(CargoTelepadVisuals.State, CargoTelepadState.Unpowered);
     }
 
-    private void OnTelepadPowerChange(EntityUid uid, CargoTelepadComponent component, PowerChangedEvent args)
+    private void OnTelepadPowerChange(EntityUid uid, CargoTelepadComponent component, ref PowerChangedEvent args)
     {
         SetEnabled(component);
     }

Content.Server/Cloning/CloningConsoleSystem.cs

@@ -59,7 +59,7 @@ namespace Content.Server.Cloning.Systems
             UpdateUserInterface(consoleComponent);
         }
 
-        private void OnPowerChanged(EntityUid uid, CloningConsoleComponent component, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, CloningConsoleComponent component, ref PowerChangedEvent args)
         {
             UpdateUserInterface(component);
         }

Content.Server/Construction/ConstructionSystem.Computer.cs

@@ -31,7 +31,7 @@ public sealed partial class ConstructionSystem
         CreateComputerBoard(component);
     }
 
-    private void OnCompPowerChange(EntityUid uid, ComputerComponent component, PowerChangedEvent args)
+    private void OnCompPowerChange(EntityUid uid, ComputerComponent component, ref PowerChangedEvent args)
     {
         if (TryComp<AppearanceComponent>(uid, out var appearance))
         {

Content.Server/Disease/DiseaseDiagnosisSystem.cs

@@ -303,7 +303,7 @@ namespace Content.Server.Disease
         /// <summary>
         /// Makes sure the machine is visually off/on.
         /// </summary>
-        private void OnPowerChanged(EntityUid uid, DiseaseMachineComponent component, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, DiseaseMachineComponent component, ref PowerChangedEvent args)
         {
             UpdateAppearance(uid, args.Powered, false);
         }

Content.Server/Disposal/Unit/EntitySystems/DisposalUnitSystem.cs

@@ -319,7 +319,7 @@ namespace Content.Server.Disposal.Unit.EntitySystems
             RemComp<ActiveDisposalUnitComponent>(uid);
         }
 
-        private void HandlePowerChange(EntityUid uid, DisposalUnitComponent component, PowerChangedEvent args)
+        private void HandlePowerChange(EntityUid uid, DisposalUnitComponent component, ref PowerChangedEvent args)
         {
             if (!component.Running)
                 return;

Content.Server/Doors/Systems/AirlockSystem.cs

@@ -30,7 +30,7 @@ namespace Content.Server.Doors.Systems
             SubscribeLocalEvent<AirlockComponent, BeforeDoorPryEvent>(OnDoorPry);
         }
 
-        private void OnPowerChanged(EntityUid uid, AirlockComponent component, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, AirlockComponent component, ref PowerChangedEvent args)
         {
             if (TryComp<AppearanceComponent>(uid, out var appearanceComponent))
             {

Content.Server/Kitchen/EntitySystems/MicrowaveSystem.cs

@@ -266,7 +266,7 @@ namespace Content.Server.Kitchen.EntitySystems
             UpdateUserInterfaceState(uid, component);
         }
 
-        private void OnPowerChanged(EntityUid uid, MicrowaveComponent component, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, MicrowaveComponent component, ref PowerChangedEvent args)
         {
             if (!args.Powered)
             {

Content.Server/Kitchen/EntitySystems/ReagentGrinderSystem.cs

@@ -34,7 +34,7 @@ namespace Content.Server.Kitchen.EntitySystems
             SubscribeLocalEvent<ReagentGrinderComponent, ComponentInit>(OnComponentInit);
             SubscribeLocalEvent<ReagentGrinderComponent, ComponentRemove>(OnComponentRemove);
 
-            SubscribeLocalEvent<ReagentGrinderComponent, PowerChangedEvent>((_, component, _) => EnqueueUiUpdate(component));
+            SubscribeLocalEvent<ReagentGrinderComponent, PowerChangedEvent>(OnPowerChange);
             SubscribeLocalEvent<ReagentGrinderComponent, InteractUsingEvent>(OnInteractUsing);
             SubscribeLocalEvent<StackComponent, ExtractableScalingEvent>(ExtractableScaling);
 
@@ -43,6 +43,11 @@ namespace Content.Server.Kitchen.EntitySystems
             SubscribeLocalEvent<ReagentGrinderComponent, ContainerIsRemovingAttemptEvent>(OnEntRemoveAttempt);
         }
 
+        private void OnPowerChange(EntityUid uid, ReagentGrinderComponent component, ref PowerChangedEvent args)
+        {
+            EnqueueUiUpdate(component);
+        }
+
         private void OnEntRemoveAttempt(EntityUid uid, ReagentGrinderComponent component, ContainerIsRemovingAttemptEvent args)
         {
             if (component.Busy)

Content.Server/Lathe/LatheSystem.cs

@@ -243,7 +243,7 @@ namespace Content.Server.Lathe
                 _appearance.SetData(uid, LatheVisuals.InsertingColor, color);
         }
 
-        private void OnPowerChanged(EntityUid uid, LatheComponent component, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, LatheComponent component, ref PowerChangedEvent args)
         {
             if (!args.Powered)
             {

Content.Server/Light/EntitySystems/EmergencyLightSystem.cs

@@ -34,7 +34,7 @@ namespace Content.Server.Light.EntitySystems
             SubscribeLocalEvent<EmergencyLightComponent, PowerChangedEvent>(OnEmergencyPower);
         }
 
-        private void OnEmergencyPower(EntityUid uid, EmergencyLightComponent component, PowerChangedEvent args)
+        private void OnEmergencyPower(EntityUid uid, EmergencyLightComponent component, ref PowerChangedEvent args)
         {
             UpdateState(component);
         }

Content.Server/Light/EntitySystems/LitOnPoweredSystem.cs

@@ -14,7 +14,7 @@ namespace Content.Server.Light.EntitySystems
             SubscribeLocalEvent<LitOnPoweredComponent, PowerNetBatterySupplyEvent>(OnPowerSupply);
         }
 
-        private void OnPowerChanged(EntityUid uid, LitOnPoweredComponent component, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, LitOnPoweredComponent component, ref PowerChangedEvent args)
         {
             if (EntityManager.TryGetComponent<PointLightComponent>(uid, out var light))
             {
@@ -22,7 +22,7 @@ namespace Content.Server.Light.EntitySystems
             }
         }
 
-        private void OnPowerSupply(EntityUid uid, LitOnPoweredComponent component, PowerNetBatterySupplyEvent args)
+        private void OnPowerSupply(EntityUid uid, LitOnPoweredComponent component, ref PowerNetBatterySupplyEvent args)
         {
             if (EntityManager.TryGetComponent<PointLightComponent>(uid, out var light))
             {

Content.Server/Light/EntitySystems/PoweredLightSystem.cs

@@ -347,7 +347,7 @@ namespace Content.Server.Light.EntitySystems
             args.Handled = true;
         }
 
-        private void OnPowerChanged(EntityUid uid, PoweredLightComponent component, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, PoweredLightComponent component, ref PowerChangedEvent args)
         {
             UpdateLight(uid, component);
         }

Content.Server/ParticleAccelerator/EntitySystems/ParticleAcceleratorSystem.ControlBox.cs

@@ -10,7 +10,7 @@ public sealed partial class ParticleAcceleratorSystem
         SubscribeLocalEvent<ParticleAcceleratorControlBoxComponent, PowerChangedEvent>(OnControlBoxPowerChange);
     }
 
-    private static void OnControlBoxPowerChange(EntityUid uid, ParticleAcceleratorControlBoxComponent component, PowerChangedEvent args)
+    private static void OnControlBoxPowerChange(EntityUid uid, ParticleAcceleratorControlBoxComponent component, ref PowerChangedEvent args)
     {
         component.OnPowerStateChanged(args);
     }

Content.Server/ParticleAccelerator/EntitySystems/ParticleAcceleratorSystem.PowerBox.cs

@@ -13,7 +13,7 @@ namespace Content.Server.ParticleAccelerator.EntitySystems
         private static void PowerBoxReceivedChanged(
             EntityUid uid,
             ParticleAcceleratorPowerBoxComponent component,
-            PowerConsumerReceivedChanged args)
+            ref PowerConsumerReceivedChanged args)
         {
             component.Master?.PowerBoxReceivedChanged(args);
         }

Content.Server/Physics/Controllers/ConveyorController.cs

@@ -87,7 +87,7 @@ namespace Content.Server.Physics.Controllers
             }
         }
 
-        private void OnPowerChanged(EntityUid uid, ConveyorComponent component, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, ConveyorComponent component, ref PowerChangedEvent args)
         {
             UpdateAppearance(component);
         }

Content.Server/Power/Components/ApcPowerReceiverComponent.cs

@@ -71,15 +71,10 @@ namespace Content.Server.Power.Components
     /// <summary>
     /// Raised whenever an ApcPowerReceiver becomes powered / unpowered.
     /// </summary>
-    public sealed class PowerChangedEvent : EntityEventArgs
+    [ByRefEvent]
+    public readonly record struct PowerChangedEvent(bool Powered, float ReceivingPower)
     {
-        public readonly bool Powered;
+        public readonly bool Powered = Powered;
-        public readonly float ReceivingPower;
+        public readonly float ReceivingPower = ReceivingPower;
-
-        public PowerChangedEvent(bool powered, float receivingPower)
-        {
-            Powered = powered;
-            ReceivingPower = receivingPower;
-        }
     }
 }

Content.Server/Power/EntitySystems/ActivatableUIRequiresPowerSystem.cs

@@ -28,7 +28,7 @@ namespace Content.Server.Power.EntitySystems
             args.Cancel();
         }
 
-        private void OnPowerChanged(EntityUid uid, ActivatableUIRequiresPowerComponent component, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, ActivatableUIRequiresPowerComponent component, ref PowerChangedEvent args)
         {
             if (!args.Powered)
                 _activatableUISystem.CloseAll(uid);

Content.Server/Power/EntitySystems/ChargerSystem.cs

@@ -47,7 +47,7 @@ internal sealed class ChargerSystem : EntitySystem
         _itemSlotsSystem.RemoveItemSlot(uid, component.ChargerSlot);
     }
 
-    private void OnPowerChanged(EntityUid uid, ChargerComponent component, PowerChangedEvent args)
+    private void OnPowerChanged(EntityUid uid, ChargerComponent component, ref PowerChangedEvent args)
     {
         component.UpdateStatus();
     }

Content.Server/Power/EntitySystems/PowerNetSystem.cs

@@ -5,6 +5,7 @@ using Content.Server.Power.NodeGroups;
 using Content.Server.Power.Pow3r;
 using JetBrains.Annotations;
 using Content.Shared.Power;
+using Robust.Server.GameObjects;
 
 namespace Content.Server.Power.EntitySystems
 {
@@ -14,6 +15,8 @@ namespace Content.Server.Power.EntitySystems
     [UsedImplicitly]
     public sealed class PowerNetSystem : EntitySystem
     {
+        [Dependency] private readonly AppearanceSystem _appearance = default!;
+
         private readonly PowerState _powerState = new();
         private readonly HashSet<PowerNet> _powerNetReconnectQueue = new();
         private readonly HashSet<ApcNet> _apcNetReconnectQueue = new();
@@ -247,23 +250,24 @@ namespace Content.Server.Power.EntitySystems
                         continue;
 
                     apcReceiver.PoweredLastUpdate = powered;
+                    var ev = new PowerChangedEvent(apcReceiver.Powered, apcReceiver.NetworkLoad.ReceivingPower);
 
-                    RaiseLocalEvent(apcReceiver.Owner, new PowerChangedEvent(apcReceiver.Powered, apcReceiver.NetworkLoad.ReceivingPower), true);
+                    RaiseLocalEvent(apcReceiver.Owner, ref ev);
 
                     if (appearanceQuery.TryGetComponent(apcReceiver.Owner, out var appearance))
-                        appearance.SetData(PowerDeviceVisuals.Powered, powered);
+                        _appearance.SetData(appearance.Owner, PowerDeviceVisuals.Powered, powered, appearance);
                 }
 
                 foreach (var consumer in EntityManager.EntityQuery<PowerConsumerComponent>())
                 {
                     var newRecv = consumer.NetworkLoad.ReceivingPower;
                     ref var lastRecv = ref consumer.LastReceived;
-                    if (!MathHelper.CloseToPercent(lastRecv, newRecv))
+                    if (MathHelper.CloseToPercent(lastRecv, newRecv))
-                    {
+                        continue;
+
                     lastRecv = newRecv;
                     var msg = new PowerConsumerReceivedChanged(newRecv, consumer.DrawRate);
-                        RaiseLocalEvent(consumer.Owner, msg, true);
+                    RaiseLocalEvent(consumer.Owner, ref msg);
-                    }
                 }
 
                 foreach (var powerNetBattery in EntityManager.EntityQuery<PowerNetworkBatteryComponent>())
@@ -273,11 +277,13 @@ namespace Content.Server.Power.EntitySystems
 
                     if (lastSupply == 0f && currentSupply != 0f)
                     {
-                        RaiseLocalEvent(powerNetBattery.Owner, new PowerNetBatterySupplyEvent {Supply = true}, true);
+                        var ev = new PowerNetBatterySupplyEvent(true);
+                        RaiseLocalEvent(powerNetBattery.Owner, ref ev);
                     }
                     else if (lastSupply > 0f && currentSupply == 0f)
                     {
-                        RaiseLocalEvent(powerNetBattery.Owner, new PowerNetBatterySupplyEvent {Supply = false}, true);
+                        var ev = new PowerNetBatterySupplyEvent(false);
+                        RaiseLocalEvent(powerNetBattery.Owner, ref ev);
                     }
 
                     powerNetBattery.LastSupply = currentSupply;
@@ -329,9 +335,11 @@ namespace Content.Server.Power.EntitySystems
                 consumer.NetworkLoad.LinkedNetwork = netNode.Id;
             }
 
+            var batteryQuery = GetEntityQuery<PowerNetworkBatteryComponent>();
+
             foreach (var apc in net.Apcs)
             {
-                var netBattery = EntityManager.GetComponent<PowerNetworkBatteryComponent>(apc.Owner);
+                var netBattery = batteryQuery.GetComponent(apc.Owner);
                 netNode.BatteriesDischarging.Add(netBattery.NetworkBattery.Id);
                 netBattery.NetworkBattery.LinkedNetworkDischarging = netNode.Id;
             }
@@ -358,16 +366,18 @@ namespace Content.Server.Power.EntitySystems
                 supplier.NetworkSupply.LinkedNetwork = netNode.Id;
             }
 
+            var batteryQuery = GetEntityQuery<PowerNetworkBatteryComponent>();
+
             foreach (var charger in net.Chargers)
             {
-                var battery = EntityManager.GetComponent<PowerNetworkBatteryComponent>(charger.Owner);
+                var battery = batteryQuery.GetComponent(charger.Owner);
                 netNode.BatteriesCharging.Add(battery.NetworkBattery.Id);
                 battery.NetworkBattery.LinkedNetworkCharging = netNode.Id;
             }
 
             foreach (var discharger in net.Dischargers)
             {
-                var battery = EntityManager.GetComponent<PowerNetworkBatteryComponent>(discharger.Owner);
+                var battery = batteryQuery.GetComponent(discharger.Owner);
                 netNode.BatteriesDischarging.Add(battery.NetworkBattery.Id);
                 battery.NetworkBattery.LinkedNetworkDischarging = netNode.Id;
             }
@@ -378,7 +388,7 @@ namespace Content.Server.Power.EntitySystems
     ///     Raised before power network simulation happens, to synchronize battery state from
     ///     components like <see cref="BatteryComponent"/> into <see cref="PowerNetworkBatteryComponent"/>.
     /// </summary>
-    public struct NetworkBatteryPreSync
+    public readonly struct NetworkBatteryPreSync
     {
     }
 
@@ -386,31 +396,27 @@ namespace Content.Server.Power.EntitySystems
     ///     Raised after power network simulation happens, to synchronize battery charge changes from
     ///     <see cref="PowerNetworkBatteryComponent"/> to components like <see cref="BatteryComponent"/>.
     /// </summary>
-    public struct NetworkBatteryPostSync
+    public readonly struct NetworkBatteryPostSync
     {
     }
 
     /// <summary>
     ///     Raised when the amount of receiving power on a <see cref="PowerConsumerComponent"/> changes.
     /// </summary>
-    public sealed class PowerConsumerReceivedChanged : EntityEventArgs
+    [ByRefEvent]
+    public readonly record struct PowerConsumerReceivedChanged(float ReceivedPower, float DrawRate)
     {
-        public float ReceivedPower { get; }
+        public readonly float ReceivedPower = ReceivedPower;
-        public float DrawRate { get; }
+        public readonly float DrawRate = DrawRate;
-
-        public PowerConsumerReceivedChanged(float receivedPower, float drawRate)
-        {
-            ReceivedPower = receivedPower;
-            DrawRate = drawRate;
-        }
     }
 
     /// <summary>
     /// Raised whenever a <see cref="PowerNetworkBatteryComponent"/> changes from / to 0 CurrentSupply.
     /// </summary>
-    public sealed class PowerNetBatterySupplyEvent : EntityEventArgs
+    [ByRefEvent]
+    public readonly record struct PowerNetBatterySupplyEvent(bool Supply)
     {
-        public bool Supply { get; init;  }
+        public readonly bool Supply = Supply;
     }
 
     public struct PowerStatistics

Content.Server/Power/EntitySystems/PowerReceiverSystem.cs

@@ -1,11 +1,14 @@
 using Content.Server.Power.Components;
 using Content.Shared.Examine;
 using Content.Shared.Power;
+using Robust.Server.GameObjects;
 
 namespace Content.Server.Power.EntitySystems
 {
     public sealed class PowerReceiverSystem : EntitySystem
     {
+        [Dependency] private readonly AppearanceSystem _appearance = default!;
+
         public override void Initialize()
         {
             base.Initialize();
@@ -25,8 +28,9 @@ namespace Content.Server.Power.EntitySystems
         private void OnExamined(EntityUid uid, ApcPowerReceiverComponent component, ExaminedEvent args)
         {
             args.PushMarkup(Loc.GetString("power-receiver-component-on-examine-main",
-                                            ("stateText", Loc.GetString( component.Powered ? "power-receiver-component-on-examine-powered" :
+                                            ("stateText", Loc.GetString( component.Powered
-                                                                                   "power-receiver-component-on-examine-unpowered"))));
+                                                ? "power-receiver-component-on-examine-powered"
+                                                : "power-receiver-component-on-examine-unpowered"))));
         }
 
         private void OnProviderShutdown(EntityUid uid, ApcPowerProviderComponent component, ComponentShutdown args)
@@ -77,11 +81,10 @@ namespace Content.Server.Power.EntitySystems
         private void ProviderChanged(ApcPowerReceiverComponent receiver)
         {
             receiver.NetworkLoad.LinkedNetwork = default;
+            var ev = new PowerChangedEvent(receiver.Powered, receiver.NetworkLoad.ReceivingPower);
 
-            RaiseLocalEvent(receiver.Owner, new PowerChangedEvent(receiver.Powered, receiver.NetworkLoad.ReceivingPower), true);
+            RaiseLocalEvent(receiver.Owner, ref ev);
-
+            _appearance.SetData(receiver.Owner, PowerDeviceVisuals.Powered, receiver.Powered);
-            if (TryComp(receiver.Owner, out AppearanceComponent? appearance))
-                appearance.SetData(PowerDeviceVisuals.Powered, receiver.Powered);
         }
 
         /// <summary>

Content.Server/Shuttles/Systems/ShuttleConsoleSystem.cs

@@ -145,7 +145,7 @@ namespace Content.Server.Shuttles.Systems
             UpdateState(component);
         }
 
-        private void OnConsolePowerChange(EntityUid uid, ShuttleConsoleComponent component, PowerChangedEvent args)
+        private void OnConsolePowerChange(EntityUid uid, ShuttleConsoleComponent component, ref PowerChangedEvent args)
         {
             UpdateState(component);
         }

Content.Server/Shuttles/Systems/ThrusterSystem.cs

@@ -223,7 +223,7 @@ namespace Content.Server.Shuttles.Systems
             DisableThruster(uid, component);
         }
 
-        private void OnPowerChange(EntityUid uid, ThrusterComponent component, PowerChangedEvent args)
+        private void OnPowerChange(EntityUid uid, ThrusterComponent component, ref PowerChangedEvent args)
         {
             if (args.Powered && CanEnable(uid, component))
             {

Content.Server/Singularity/EntitySystems/EmitterSystem.cs

@@ -71,7 +71,7 @@ namespace Content.Server.Singularity.EntitySystems
         private void ReceivedChanged(
             EntityUid uid,
             EmitterComponent component,
-            PowerConsumerReceivedChanged args)
+            ref PowerConsumerReceivedChanged args)
         {
             if (!component.IsOn)
             {

Content.Server/SurveillanceCamera/Systems/SurveillanceCameraMonitorSystem.cs

@@ -181,7 +181,7 @@ public sealed class SurveillanceCameraMonitorSystem : EntitySystem
         TrySwitchCameraByAddress(uid, message.Address, component);
     }
 
-    private void OnPowerChanged(EntityUid uid, SurveillanceCameraMonitorComponent component, PowerChangedEvent args)
+    private void OnPowerChanged(EntityUid uid, SurveillanceCameraMonitorComponent component, ref PowerChangedEvent args)
     {
         if (!args.Powered)
         {

Content.Server/SurveillanceCamera/Systems/SurveillanceCameraRouterSystem.cs

@@ -86,7 +86,7 @@ public sealed class SurveillanceCameraRouterSystem : EntitySystem
         }
     }
 
-    private void OnPowerChanged(EntityUid uid, SurveillanceCameraRouterComponent component, PowerChangedEvent args)
+    private void OnPowerChanged(EntityUid uid, SurveillanceCameraRouterComponent component, ref PowerChangedEvent args)
     {
         component.MonitorRoutes.Clear();
         component.Active = args.Powered;

Content.Server/SurveillanceCamera/Systems/SurveillanceCameraSystem.cs

@@ -143,7 +143,7 @@ public sealed class SurveillanceCameraSystem : EntitySystem
 
 
 
-    private void OnPowerChanged(EntityUid camera, SurveillanceCameraComponent component, PowerChangedEvent args)
+    private void OnPowerChanged(EntityUid camera, SurveillanceCameraComponent component, ref PowerChangedEvent args)
     {
         SetActive(camera, args.Powered, component);
     }

Content.Server/VendingMachines/VendingMachineSystem.cs

@@ -119,7 +119,7 @@ namespace Content.Server.VendingMachines
             AuthorizedVend(uid, entity, args.Type, args.ID, component);
         }
 
-        private void OnPowerChanged(EntityUid uid, VendingMachineComponent component, PowerChangedEvent args)
+        private void OnPowerChanged(EntityUid uid, VendingMachineComponent component, ref PowerChangedEvent args)
         {
             TryUpdateVisualState(uid, component);
         }

Content.Server/Wires/WiresSystem.cs

@@ -391,7 +391,7 @@ public sealed class WiresSystem : EntitySystem
     #endregion
 
     #region Event Handling
-    private void OnWiresPowered(EntityUid uid, WiresComponent component, PowerChangedEvent args)
+    private void OnWiresPowered(EntityUid uid, WiresComponent component, ref PowerChangedEvent args)
     {
         UpdateUserInterface(uid);
         foreach (var wire in component.WiresList)