diff --git a/homeassistant/components/homematic/sensor.py b/homeassistant/components/homematic/sensor.py
index 964ba15cd0a..62f2f0ccdff 100644
--- a/homeassistant/components/homematic/sensor.py
+++ b/homeassistant/components/homematic/sensor.py
@@ -52,6 +52,8 @@ HM_UNIT_HA_CAST = {
     "ENERGY_COUNTER": ENERGY_WATT_HOUR,
     "GAS_POWER": VOLUME_CUBIC_METERS,
     "GAS_ENERGY_COUNTER": VOLUME_CUBIC_METERS,
+    "IEC_POWER": POWER_WATT,
+    "IEC_ENERGY_COUNTER": ENERGY_WATT_HOUR,
     "LUX": LIGHT_LUX,
     "ILLUMINATION": LIGHT_LUX,
     "CURRENT_ILLUMINATION": LIGHT_LUX,