From bb9053e93de6d4d957832d7724a255abf8b99997 Mon Sep 17 00:00:00 2001
From: Erik Montnemery <erik@montnemery.com>
Date: Tue, 19 Oct 2021 20:08:44 +0200
Subject: [PATCH] Add MWh as an energy unit (#58034)

---
 homeassistant/components/sensor/recorder.py | 2 ++
 homeassistant/const.py                      | 1 +
 2 files changed, 3 insertions(+)

diff --git a/homeassistant/components/sensor/recorder.py b/homeassistant/components/sensor/recorder.py
index 3ac4cf4e53b..9cc4ea9c434 100644
--- a/homeassistant/components/sensor/recorder.py
+++ b/homeassistant/components/sensor/recorder.py
@@ -39,6 +39,7 @@ from homeassistant.const import (
     ATTR_UNIT_OF_MEASUREMENT,
     DEVICE_CLASS_POWER,
     ENERGY_KILO_WATT_HOUR,
+    ENERGY_MEGA_WATT_HOUR,
     ENERGY_WATT_HOUR,
     POWER_KILO_WATT,
     POWER_WATT,
@@ -95,6 +96,7 @@ UNIT_CONVERSIONS: dict[str, dict[str, Callable]] = {
     # Convert energy to kWh
     DEVICE_CLASS_ENERGY: {
         ENERGY_KILO_WATT_HOUR: lambda x: x,
+        ENERGY_MEGA_WATT_HOUR: lambda x: x * 1000,
         ENERGY_WATT_HOUR: lambda x: x / 1000,
     },
     # Convert power W
diff --git a/homeassistant/const.py b/homeassistant/const.py
index 1c3029a9d34..6e9f8ee97d7 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -419,6 +419,7 @@ POWER_VOLT_AMPERE: Final = "VA"
 # Energy units
 ENERGY_WATT_HOUR: Final = "Wh"
 ENERGY_KILO_WATT_HOUR: Final = "kWh"
+ENERGY_MEGA_WATT_HOUR: Final = "MWh"
 
 # Electric_current units
 ELECTRIC_CURRENT_MILLIAMPERE: Final = "mA"