KDE Power profiles are now managed by a separate file, so it is easier to select between them without changing theme.

plasma/settings/powerProfile.nix

@@ -0,0 +1,65 @@
+{pkgs, inputs, username, project, powerProfile, ...}:
+let
+  profiles = {
+    laptop = {
+      AC.powerProfile = "powerSaving";
+      battery.powerProfile = "powerSaving";
+      lowBattery.powerProfile = "powerSaving";
+    };
+    desktop = {
+      AC.powerProfile = "performance";
+      battery.powerProfile = "performance";
+      lowBattery.powerProfile = "performance";
+    };
+  };
+
+  selectedProfile = profiles.${powerProfile};
+in
+{
+  programs = {
+    plasma = {
+      overrideConfig = true;
+
+      powerdevil = {
+        AC = {
+          powerProfile = selectedProfile.AC.powerProfile;
+          autoSuspend = {
+            action = "nothing";
+          };
+          dimDisplay.enable = false;
+          turnOffDisplay.idleTimeout = "never";
+        };
+
+        battery = {
+          powerProfile = selectedProfile.battery.powerProfile;
+          autoSuspend = {
+            action = "nothing";
+          };
+          whenLaptopLidClosed = "sleep";
+          dimDisplay.enable = false;
+          turnOffDisplay.idleTimeout = "never";
+        };
+
+        lowBattery = {
+          powerProfile = selectedProfile.lowBattery.powerProfile;
+          autoSuspend = {
+            action = "sleep";
+            idleTimeout = 300;
+          };
+          whenLaptopLidClosed = "sleep";
+          dimDisplay = {
+            idleTimeout = 60;
+          };
+          displayBrightness = 30;
+          turnOffDisplay.idleTimeout = 120;
+        };
+
+        batteryLevels = {
+          lowLevel = 10;
+          criticalLevel = 5;
+          criticalAction = "sleep";
+        };
+      };
+    };
+  };
+}