diff --git a/hosts/galleria/home.nix b/hosts/galleria/home.nix
index f6ad7aa..1d84068 100644
--- a/hosts/galleria/home.nix
+++ b/hosts/galleria/home.nix
@@ -4,6 +4,11 @@
   ...
 }:
 {
+  # This desktop is permanently connected to AC power.
+  systemd.user.services.swayidle.Service.Environment = [
+    "SWAYIDLE_ASSUME_AC=1"
+  ];
+
   services.kanshi = {
     enable = true;
 
diff --git a/modules/services/swayidle/home/nixos.nix b/modules/services/swayidle/home/nixos.nix
index 9ff909b..461540a 100644
--- a/modules/services/swayidle/home/nixos.nix
+++ b/modules/services/swayidle/home/nixos.nix
@@ -10,6 +10,8 @@ let
   brightnessState = "$XDG_RUNTIME_DIR/swayidle-brightness";
 
   onBattery = pkgs.writeShellScript "swayidle-on-battery" ''
+    [ "''${SWAYIDLE_ASSUME_AC:-0}" = 1 ] && exit 1
+
     for supply in /sys/class/power_supply/*; do
       [ -f "$supply/type" ] || continue
       [ "$(< "$supply/type")" = "Battery" ] || continue
@@ -45,7 +47,7 @@ let
   '';
 
   suspend = pkgs.writeShellScript "swayidle-suspend" ''
-    if ${onBattery}; then
+    if ${onBattery} || ${isLocked}; then
       exec ${systemctl} suspend
     fi
   '';
diff --git a/modules/systems/nix/common.nix b/modules/systems/nix/common.nix
index 270334e..0a656ff 100644
--- a/modules/systems/nix/common.nix
+++ b/modules/systems/nix/common.nix
@@ -13,6 +13,7 @@
       "https://moons-dotfiles.cachix.org"
       "https://noctalia.cachix.org"
       "https://vicinae.cachix.org"
+      "https://ghostty.cachix.org"
       "https://cache.numtide.com"
       "https://codex-desktop-linux.cachix.org"
     ];
@@ -23,6 +24,7 @@
       "moons-dotfiles.cachix.org-1:WHoroKiNScG2/dpxHHL1I0qVmvuQhJbEAP+DS2j9Rr0="
       "noctalia.cachix.org-1:pCOR47nnMEo5thcxNDtzWpOxNFQsBRglJzxWPp3dkU4="
       "vicinae.cachix.org-1:1kDrfienkGHPYbkpNj1mWTr7Fm1+zcenzgTizIcI3oc="
+      "ghostty.cachix.org-1:QB389yTa6gTyneehvqG58y0WnHjQOqgnA+wBnpWWxns="
       "niks3.numtide.com-1:DTx8wZduET09hRmMtKdQDxNNthLQETkc/yaX7M4qK0g="
       "codex-desktop-linux.cachix.org-1:nX/xy6AdK9hQE24A8ALGjkCKj2ObFmcnemiL5Cid4nk="
     ];