diff --git a/homeassistant/components/energy/websocket_api.py b/homeassistant/components/energy/websocket_api.py
index ad77308b410..7ba83cf15c9 100644
--- a/homeassistant/components/energy/websocket_api.py
+++ b/homeassistant/components/energy/websocket_api.py
@@ -13,6 +13,7 @@ from typing import Any, cast
 import voluptuous as vol
 
 from homeassistant.components import recorder, websocket_api
+from homeassistant.const import ENERGY_KILO_WATT_HOUR
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.integration_platform import (
     async_process_integration_platforms,
@@ -268,6 +269,7 @@ async def ws_get_fossil_energy_consumption(
         statistic_ids,
         "hour",
         True,
+        {"energy": ENERGY_KILO_WATT_HOUR},
     )
 
     def _combine_sum_statistics(
diff --git a/tests/components/energy/test_websocket_api.py b/tests/components/energy/test_websocket_api.py
index ab785291f91..343e814f3a8 100644
--- a/tests/components/energy/test_websocket_api.py
+++ b/tests/components/energy/test_websocket_api.py
@@ -814,25 +814,25 @@ async def test_fossil_energy_consumption(hass, hass_ws_client, recorder_mock):
             "start": period1,
             "last_reset": None,
             "state": 0,
-            "sum": 20,
+            "sum": 20000,
         },
         {
             "start": period2,
             "last_reset": None,
             "state": 1,
-            "sum": 30,
+            "sum": 30000,
         },
         {
             "start": period3,
             "last_reset": None,
             "state": 2,
-            "sum": 40,
+            "sum": 40000,
         },
         {
             "start": period4,
             "last_reset": None,
             "state": 3,
-            "sum": 50,
+            "sum": 50000,
         },
     )
     external_energy_metadata_2 = {
@@ -841,7 +841,7 @@ async def test_fossil_energy_consumption(hass, hass_ws_client, recorder_mock):
         "name": "Total imported energy",
         "source": "test",
         "statistic_id": "test:total_energy_import_tariff_2",
-        "unit_of_measurement": "kWh",
+        "unit_of_measurement": "Wh",
     }
     external_co2_statistics = (
         {