diff --git a/homeassistant/components/opower/__init__.py b/homeassistant/components/opower/__init__.py
index 136a1a4e57a..b8e4f4381d0 100644
--- a/homeassistant/components/opower/__init__.py
+++ b/homeassistant/components/opower/__init__.py
@@ -2,18 +2,14 @@
 
 from __future__ import annotations
 
-from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import Platform
 from homeassistant.core import HomeAssistant
 
-from .coordinator import OpowerCoordinator
+from .coordinator import OpowerConfigEntry, OpowerCoordinator
 
 PLATFORMS: list[Platform] = [Platform.SENSOR]
 
 
-type OpowerConfigEntry = ConfigEntry[OpowerCoordinator]
-
-
 async def async_setup_entry(hass: HomeAssistant, entry: OpowerConfigEntry) -> bool:
     """Set up Opower from a config entry."""
 
diff --git a/homeassistant/components/opower/coordinator.py b/homeassistant/components/opower/coordinator.py
index 6957ae4984c..8d7ef1ace94 100644
--- a/homeassistant/components/opower/coordinator.py
+++ b/homeassistant/components/opower/coordinator.py
@@ -23,6 +23,7 @@ from homeassistant.components.recorder.statistics import (
     get_last_statistics,
     statistics_during_period,
 )
+from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import CONF_PASSWORD, CONF_USERNAME, UnitOfEnergy, UnitOfVolume
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.exceptions import ConfigEntryAuthFailed
@@ -34,10 +35,14 @@ from .const import CONF_TOTP_SECRET, CONF_UTILITY, DOMAIN
 
 _LOGGER = logging.getLogger(__name__)
 
+type OpowerConfigEntry = ConfigEntry[OpowerCoordinator]
+
 
 class OpowerCoordinator(DataUpdateCoordinator[dict[str, Forecast]]):
     """Handle fetching Opower data, updating sensors and inserting statistics."""
 
+    config_entry: OpowerConfigEntry
+
     def __init__(
         self,
         hass: HomeAssistant,
@@ -59,6 +64,7 @@ class OpowerCoordinator(DataUpdateCoordinator[dict[str, Forecast]]):
             entry_data[CONF_PASSWORD],
             entry_data.get(CONF_TOTP_SECRET),
         )
+        self._statistic_ids: set[str] = set()
 
         @callback
         def _dummy_listener() -> None:
@@ -70,6 +76,12 @@ class OpowerCoordinator(DataUpdateCoordinator[dict[str, Forecast]]):
         # _async_update_data not periodically getting called which is needed for _insert_statistics.
         self.async_add_listener(_dummy_listener)
 
+        self.config_entry.async_on_unload(self._clear_statistics)
+
+    def _clear_statistics(self) -> None:
+        """Clear statistics."""
+        get_instance(self.hass).async_clear_statistics(list(self._statistic_ids))
+
     async def _async_update_data(
         self,
     ) -> dict[str, Forecast]:
@@ -115,6 +127,8 @@ class OpowerCoordinator(DataUpdateCoordinator[dict[str, Forecast]]):
             )
             cost_statistic_id = f"{DOMAIN}:{id_prefix}_energy_cost"
             consumption_statistic_id = f"{DOMAIN}:{id_prefix}_energy_consumption"
+            self._statistic_ids.add(cost_statistic_id)
+            self._statistic_ids.add(consumption_statistic_id)
             _LOGGER.debug(
                 "Updating Statistics for %s and %s",
                 cost_statistic_id,
diff --git a/homeassistant/components/opower/sensor.py b/homeassistant/components/opower/sensor.py
index f9d0fe62332..1b3aa0fd710 100644
--- a/homeassistant/components/opower/sensor.py
+++ b/homeassistant/components/opower/sensor.py
@@ -20,9 +20,8 @@ from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.typing import StateType
 from homeassistant.helpers.update_coordinator import CoordinatorEntity
 
-from . import OpowerConfigEntry
 from .const import DOMAIN
-from .coordinator import OpowerCoordinator
+from .coordinator import OpowerConfigEntry, OpowerCoordinator
 
 
 @dataclass(frozen=True, kw_only=True)