diff --git a/homeassistant/components/homematicip_cloud/sensor.py b/homeassistant/components/homematicip_cloud/sensor.py
index e053c191c6b..2038433df4f 100644
--- a/homeassistant/components/homematicip_cloud/sensor.py
+++ b/homeassistant/components/homematicip_cloud/sensor.py
@@ -2,8 +2,8 @@
 import logging
 
 from homeassistant.const import (
-    DEVICE_CLASS_HUMIDITY, DEVICE_CLASS_ILLUMINANCE, DEVICE_CLASS_TEMPERATURE,
-    POWER_WATT, TEMP_CELSIUS)
+    DEVICE_CLASS_HUMIDITY, DEVICE_CLASS_ILLUMINANCE, DEVICE_CLASS_POWER,
+    DEVICE_CLASS_TEMPERATURE, POWER_WATT, TEMP_CELSIUS)
 
 from . import DOMAIN as HMIPC_DOMAIN, HMIPC_HAPID, HomematicipGenericDevice
 
@@ -238,6 +238,11 @@ class HomematicipPowerSensor(HomematicipGenericDevice):
         """Initialize the  device."""
         super().__init__(home, device, 'Power')
 
+    @property
+    def device_class(self):
+        """Return the device class of the sensor."""
+        return DEVICE_CLASS_POWER
+
     @property
     def state(self):
         """Represenation of the HomematicIP power comsumption value."""
diff --git a/homeassistant/components/sensor/__init__.py b/homeassistant/components/sensor/__init__.py
index 031657066cb..e11ace9749c 100644
--- a/homeassistant/components/sensor/__init__.py
+++ b/homeassistant/components/sensor/__init__.py
@@ -5,12 +5,13 @@ import logging
 
 import voluptuous as vol
 
-from homeassistant.helpers.entity_component import EntityComponent
-from homeassistant.helpers.config_validation import (  # noqa
-    PLATFORM_SCHEMA, PLATFORM_SCHEMA_BASE)
 from homeassistant.const import (
     DEVICE_CLASS_BATTERY, DEVICE_CLASS_HUMIDITY, DEVICE_CLASS_ILLUMINANCE,
-    DEVICE_CLASS_TEMPERATURE, DEVICE_CLASS_TIMESTAMP, DEVICE_CLASS_PRESSURE)
+    DEVICE_CLASS_POWER, DEVICE_CLASS_PRESSURE, DEVICE_CLASS_TEMPERATURE,
+    DEVICE_CLASS_TIMESTAMP)
+from homeassistant.helpers.config_validation import (  # noqa
+    PLATFORM_SCHEMA, PLATFORM_SCHEMA_BASE)
+from homeassistant.helpers.entity_component import EntityComponent
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -26,6 +27,7 @@ DEVICE_CLASSES = [
     DEVICE_CLASS_TEMPERATURE,  # temperature (C/F)
     DEVICE_CLASS_TIMESTAMP,  # timestamp (ISO8601)
     DEVICE_CLASS_PRESSURE,  # pressure (hPa/mbar)
+    DEVICE_CLASS_POWER,  # power (W/kW)
 ]
 
 DEVICE_CLASSES_SCHEMA = vol.All(vol.Lower, vol.In(DEVICE_CLASSES))
diff --git a/homeassistant/const.py b/homeassistant/const.py
index 9987e0f8e99..e0130f3ccef 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -188,6 +188,7 @@ DEVICE_CLASS_ILLUMINANCE = 'illuminance'
 DEVICE_CLASS_TEMPERATURE = 'temperature'
 DEVICE_CLASS_TIMESTAMP = 'timestamp'
 DEVICE_CLASS_PRESSURE = 'pressure'
+DEVICE_CLASS_POWER = 'power'
 
 # #### STATES ####
 STATE_ON = 'on'