diff --git a/homeassistant/components/enphase_envoy/sensor.py b/homeassistant/components/enphase_envoy/sensor.py
index 0e0a2aacfd7..33b9e3a64df 100644
--- a/homeassistant/components/enphase_envoy/sensor.py
+++ b/homeassistant/components/enphase_envoy/sensor.py
@@ -563,16 +563,14 @@ class EnvoyEnpowerEntity(EnvoySensorBaseEntity):
     ) -> None:
         """Initialize Enpower entity."""
         super().__init__(coordinator, description)
-        assert coordinator.envoy.data is not None
-        enpower_data = coordinator.envoy.data.enpower
+        enpower_data = self.data.enpower
         assert enpower_data is not None
-        self._serial_number = enpower_data.serial_number
-        self._attr_unique_id = f"{self._serial_number}_{description.key}"
+        self._attr_unique_id = f"{enpower_data.serial_number}_{description.key}"
         self._attr_device_info = DeviceInfo(
-            identifiers={(DOMAIN, self._serial_number)},
+            identifiers={(DOMAIN, enpower_data.serial_number)},
             manufacturer="Enphase",
             model="Enpower",
-            name=f"Enpower {self._serial_number}",
+            name=f"Enpower {enpower_data.serial_number}",
             sw_version=str(enpower_data.firmware_version),
             via_device=(DOMAIN, self.envoy_serial_num),
         )