diff --git a/homeassistant/components/opower/coordinator.py b/homeassistant/components/opower/coordinator.py
index 4d40bb3356bfee..c331f45bc4977c 100644
--- a/homeassistant/components/opower/coordinator.py
+++ b/homeassistant/components/opower/coordinator.py
@@ -32,7 +32,7 @@
 _LOGGER = logging.getLogger(__name__)
 
 
-class OpowerCoordinator(DataUpdateCoordinator):
+class OpowerCoordinator(DataUpdateCoordinator[dict[str, Forecast]]):
     """Handle fetching Opower data, updating sensors and inserting statistics."""
 
     def __init__(
diff --git a/homeassistant/components/opower/sensor.py b/homeassistant/components/opower/sensor.py
index e28dcbd0661a75..22393c629a027f 100644
--- a/homeassistant/components/opower/sensor.py
+++ b/homeassistant/components/opower/sensor.py
@@ -157,7 +157,7 @@ async def async_setup_entry(
 
     coordinator: OpowerCoordinator = hass.data[DOMAIN][entry.entry_id]
     entities: list[OpowerSensor] = []
-    forecasts: list[Forecast] = coordinator.data.values()
+    forecasts = coordinator.data.values()
     for forecast in forecasts:
         device_id = f"{coordinator.api.utility.subdomain()}_{forecast.account.utility_account_id}"
         device = DeviceInfo(