diff --git a/lib/homeassistant.js b/lib/homeassistant.js
index f6a0f0f2..98f3039a 100644
--- a/lib/homeassistant.js
+++ b/lib/homeassistant.js
@@ -115,6 +115,7 @@ const configurations = {
             unit_of_measurement: 'Watt',
             icon: 'mdi:flash',
             value_template: '{{ value_json.power }}',
+            json_attributes: ['voltage'],
         },
     },
     'sensor_action': {