Correct unit of vera power meter sensor (#69285)

homeassistant/components/vera/sensor.py

@@ -11,6 +11,7 @@ from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import (
     LIGHT_LUX,
     PERCENTAGE,
+    POWER_WATT,
     TEMP_CELSIUS,
     TEMP_FAHRENHEIT,
     Platform,
@@ -72,7 +73,7 @@ class VeraSensor(VeraDevice[veraApi.VeraSensor], SensorEntity):
         if self.vera_device.category == veraApi.CATEGORY_HUMIDITY_SENSOR:
             return PERCENTAGE
         if self.vera_device.category == veraApi.CATEGORY_POWER_METER:
-            return "watts"
+            return POWER_WATT
         return None
 
     def update(self) -> None: