diff --git a/homeassistant/components/powerwall/entity.py b/homeassistant/components/powerwall/entity.py
index 0411f956bdc..04bb75fd47a 100644
--- a/homeassistant/components/powerwall/entity.py
+++ b/homeassistant/components/powerwall/entity.py
@@ -9,7 +9,6 @@ from .const import (
     POWERWALL_SITE_NAME,
     SITE_INFO_GRID_CODE,
     SITE_INFO_NOMINAL_SYSTEM_ENERGY_KWH,
-    SITE_INFO_NOMINAL_SYSTEM_POWER_KW,
     SITE_INFO_UTILITY,
 )
 
@@ -26,7 +25,6 @@ class PowerWallEntity(Entity):
         unique_group = (
             site_info[SITE_INFO_UTILITY],
             site_info[SITE_INFO_GRID_CODE],
-            str(site_info[SITE_INFO_NOMINAL_SYSTEM_POWER_KW]),
             str(site_info[SITE_INFO_NOMINAL_SYSTEM_ENERGY_KWH]),
         )
         self.base_unique_id = "_".join(unique_group)
diff --git a/tests/components/powerwall/test_sensor.py b/tests/components/powerwall/test_sensor.py
index ea74f33671f..090e5dac445 100644
--- a/tests/components/powerwall/test_sensor.py
+++ b/tests/components/powerwall/test_sensor.py
@@ -24,7 +24,7 @@ async def test_sensors(hass):
 
     device_registry = await hass.helpers.device_registry.async_get_registry()
     reg_device = device_registry.async_get_device(
-        identifiers={("powerwall", "Wom Energy_60Hz_240V_s_IEEE1547a_2014_25_13.5")},
+        identifiers={("powerwall", "Wom Energy_60Hz_240V_s_IEEE1547a_2014_13.5")},
         connections=set(),
     )
     assert reg_device.model == "PowerWall 2"