Definitions for

**"Gigawatt hour"**A GWH is one million kilowatt- hours of electric power.

A unit or measure of electricity supply or consumption of 1 million kilowatts over the period of one hour.

One gigawatt hour (GWh) equals one million kilowatt hours. A kilowatt hour (KWh) is equivalent to the energy consumed by a 100 watt light bulb burning for 10 hours.