Btu (3.9°C)
The Btu (3.9°C) is defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit at the temperature where water reaches its maximum density which occurs at approximately 3.9°C (39°F).
Megawatt-hours
A megawatt-hour (MWh) is the amount of energy consumed when one megawatt (MW) of power is used for one hour. It is used to measure large-scale energy production or consumption such as power plants.