Gigawatt (GW) (GW)3 topics · 3 sources ScienceEnergyA unit of power equal to 1 billion Watts; 1 million kilowatts, or 1,000 megawatts.US DOE Office of Energy Efficiency & Renewable Energy — Glossary of Energy-Related Terms retrieved 2014-05-26 Cite Science› EnergyEnergy Market1 billion watts, the same as 1,000 Megawatts, or 1 million kilowatts.FERC — Guide to Market Oversight Glossary retrieved 2014-06-26 Cite ScienceWaterUnit of power equal to 1 billion watts. Bureau of Reclamation — Bureau of Reclamation Glossary Cite