diff --git a/modules/modules/services/apcupsd.nix b/modules/modules/services/apcupsd.nix
new file mode 100644
index 0000000..365ee5a
--- /dev/null
+++ b/modules/modules/services/apcupsd.nix
@@ -0,0 +1,47 @@
+{ config, options, lib, pkgs, ... }:
+with lib;
+with lib.hlissner;
+let
+  cfg = config.modules.services.apcupsd;
+  port = 3551;
+in
+{
+  options.modules.services.apcupsd = with types; {
+    enable = mkBoolOpt false;
+    primary = mkBoolOpt true;
+    config = {
+      address = mkOpt str "127.0.0.1";
+      hooks = mkOpt (attrsOf lines) { };
+      battery_level = mkOpt int (if cfg.primary then 35 else 50);
+      minutes = mkOpt int (if cfg.primary then 5 else 10);
+    };
+  };
+
+  config = mkIf cfg.enable {
+    services.apcupsd = {
+      enable = true;
+      configText = ''
+        UPSNAME UPS
+        UPSCLASS standalone
+        UPSMODE disable
+        NETSERVER on
+        NISPORT ${toString port}
+
+        BATTERYLEVEL ${toString cfg.config.battery_level}
+        MINUTES ${toString cfg.config.minutes}
+      '' +
+      (if cfg.primary then ''
+        UPSTYPE usb
+        UPSCABLE usb
+        NISIP ${cfg.config.address}
+      '' else ''
+        UPSCABLE ether
+        UPSTYPE net
+        DEVICE ${cfg.config.address}:${toString port}
+        POLLTIME 10
+      '');
+      hooks = cfg.config.hooks;
+    };
+    networking.firewall.allowedTCPPorts = mkIf cfg.primary [ port ];
+  };
+}