diff --git a/homeassistant/components/peco/sensor.py b/homeassistant/components/peco/sensor.py
index 60a3a07212d..d08947eb0ec 100644
--- a/homeassistant/components/peco/sensor.py
+++ b/homeassistant/components/peco/sensor.py
@@ -25,21 +25,14 @@ from . import PECOCoordinatorData
 from .const import ATTR_CONTENT, CONF_COUNTY, DOMAIN
 
 
-@dataclass(frozen=True)
-class PECOSensorEntityDescriptionMixin:
-    """Mixin for required keys."""
+@dataclass(frozen=True, kw_only=True)
+class PECOSensorEntityDescription(SensorEntityDescription):
+    """Description for PECO sensor."""
 
     value_fn: Callable[[PECOCoordinatorData], int | str]
     attribute_fn: Callable[[PECOCoordinatorData], dict[str, str]]
 
 
-@dataclass(frozen=True)
-class PECOSensorEntityDescription(
-    SensorEntityDescription, PECOSensorEntityDescriptionMixin
-):
-    """Description for PECO sensor."""
-
-
 PARALLEL_UPDATES: Final = 0
 SENSOR_LIST: tuple[PECOSensorEntityDescription, ...] = (
     PECOSensorEntityDescription(