diff --git a/hosts/lazyworkhorse/configuration.nix b/hosts/lazyworkhorse/configuration.nix
index f1afae4..eb521a4 100644
--- a/hosts/lazyworkhorse/configuration.nix
+++ b/hosts/lazyworkhorse/configuration.nix
@@ -342,6 +342,44 @@
     HIP_VISIBLE_DEVICES = "0,1";
   };
 
+  # ── UPS (Uninterruptible Power Supply) ──────────────────────────────
+  # APC Back-UPS BVK1200M2 connected via USB (vendor 051d, product 0002)
+  power.ups = {
+    enable = true;
+    mode = "standalone";
+
+    ups = {
+      apc-backups = {
+        driver = "usbhid-ups";
+        port = "auto";
+        description = "APC Back-UPS BVK1200M2";
+      };
+    };
+
+    upsd = {
+      listen = [{
+        address = "127.0.0.1";
+      }];
+    };
+
+    users = {
+      nutmon = {
+        passwordFile = pkgs.writeText "ups-nutmon-password" "ups-nutmon-2025";
+        upsmon = "primary";
+      };
+    };
+
+    upsmon = {
+      monitor = {
+        apc-backups = {
+          system = "apc-backups@localhost";
+          user = "nutmon";
+          type = "master";
+        };
+      };
+    };
+  };
+
  # Open ports in the firewall.
   # networking.firewall.allowedTCPPorts = [ ... ];
   # networking.firewall.allowedUDPPorts = [ ... ];