diff --git a/homeassistant/components/epion/sensor.py b/homeassistant/components/epion/sensor.py
index 826d565c2cd..c722e73ac6c 100644
--- a/homeassistant/components/epion/sensor.py
+++ b/homeassistant/components/epion/sensor.py
@@ -88,9 +88,9 @@ class EpionSensor(CoordinatorEntity[EpionCoordinator], SensorEntity):
         super().__init__(coordinator)
         self._epion_device_id = epion_device_id
         self.entity_description = description
-        self.unique_id = f"{epion_device_id}_{description.key}"
+        self._attr_unique_id = f"{epion_device_id}_{description.key}"
         self._attr_device_info = DeviceInfo(
-            identifiers={(DOMAIN, self._epion_device_id)},
+            identifiers={(DOMAIN, epion_device_id)},
             manufacturer="Epion",
             name=self.device.get("deviceName"),
             sw_version=self.device.get("fwVersion"),