diff --git a/homeassistant/components/ovo_energy/__init__.py b/homeassistant/components/ovo_energy/__init__.py
index aa05c83ae76..f8c23b4f4f0 100644
--- a/homeassistant/components/ovo_energy/__init__.py
+++ b/homeassistant/components/ovo_energy/__init__.py
@@ -99,12 +99,10 @@ class OVOEnergyEntity(CoordinatorEntity):
         self,
         coordinator: DataUpdateCoordinator,
         client: OVOEnergy,
-        key: str,
     ) -> None:
         """Initialize the OVO Energy entity."""
         super().__init__(coordinator)
         self._client = client
-        self._attr_unique_id = key
 
 
 class OVOEnergyDeviceEntity(OVOEnergyEntity):
diff --git a/homeassistant/components/ovo_energy/sensor.py b/homeassistant/components/ovo_energy/sensor.py
index cd84fa5a5d6..16fd15bfbde 100644
--- a/homeassistant/components/ovo_energy/sensor.py
+++ b/homeassistant/components/ovo_energy/sensor.py
@@ -57,7 +57,6 @@ SENSOR_TYPES_ELECTRICITY: tuple[OVOEnergySensorEntityDescription, ...] = (
         name="OVO Last Electricity Cost",
         device_class=DEVICE_CLASS_MONETARY,
         state_class=STATE_CLASS_TOTAL_INCREASING,
-        icon="mdi:cash-multiple",
         value=lambda usage: usage.electricity[-1].consumption,
     ),
     OVOEnergySensorEntityDescription(
@@ -157,8 +156,8 @@ class OVOEnergySensor(OVOEnergyDeviceEntity, SensorEntity):
         super().__init__(
             coordinator,
             client,
-            f"{DOMAIN}_{client.account_id}_{description.key}",
         )
+        self._attr_unique_id = f"{DOMAIN}_{client.account_id}_{description.key}"
         self.entity_description = description
 
     @property