diff --git a/homeassistant/components/number/const.py b/homeassistant/components/number/const.py
index 61a4fa644b0..07c849278d4 100644
--- a/homeassistant/components/number/const.py
+++ b/homeassistant/components/number/const.py
@@ -486,6 +486,7 @@ DEVICE_CLASS_UNITS: dict[NumberDeviceClass, set[type[StrEnum] | str | None]] = {
     NumberDeviceClass.PM25: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
     NumberDeviceClass.POWER_FACTOR: {PERCENTAGE, None},
     NumberDeviceClass.POWER: {
+        UnitOfPower.MILLIWATT,
         UnitOfPower.WATT,
         UnitOfPower.KILO_WATT,
         UnitOfPower.MEGA_WATT,
diff --git a/homeassistant/components/sensor/const.py b/homeassistant/components/sensor/const.py
index 8eccb758756..1edb87f4bce 100644
--- a/homeassistant/components/sensor/const.py
+++ b/homeassistant/components/sensor/const.py
@@ -582,6 +582,7 @@ DEVICE_CLASS_UNITS: dict[SensorDeviceClass, set[type[StrEnum] | str | None]] = {
     SensorDeviceClass.PM25: {CONCENTRATION_MICROGRAMS_PER_CUBIC_METER},
     SensorDeviceClass.POWER_FACTOR: {PERCENTAGE, None},
     SensorDeviceClass.POWER: {
+        UnitOfPower.MILLIWATT,
         UnitOfPower.WATT,
         UnitOfPower.KILO_WATT,
         UnitOfPower.MEGA_WATT,