Convert Megawatt-Hours to Gigawatt-Hours
Convert Megawatt-Hours (MWh) to Gigawatt-Hours (GWh) instantly and accurately.
Conversion Formula
GWh = MWh × 0.001
About Megawatt-Hours
A megawatt-hour (MWh) is the energy from 1 MW for one hour - exactly 3.6 GJ. It is the standard unit for wholesale electricity trading. Power purchase agreements (PPAs) specify capacity and price in $/MWh or €/MWh. A 5 MW wind turbine at full capacity generates 5 MWh/h. Primary aluminium smelting consumes 13-15 MWh per tonne. The Moss Landing battery (California) stores 3,287 MWh. The daily output of a 1 GW nuclear plant at 90% capacity factor is ~21,600 MWh. 1 MWh = 3.6 GJ = 3,412,141 BTU = 1,000 kWh.
About Gigawatt-Hours
A gigawatt-hour (GWh) is the energy from 1 GW for one hour - exactly 3.6 TJ. National electricity generation is reported in annual GWh: Ireland ~32,000 GWh/year; France ~496,000 GWh/year. The Hornsea One offshore wind farm (1.12 GW) generates ~4,000 GWh/year. The Bath County Pumped Storage (3 GW, USA) stores ~24 GWh. World total battery storage capacity reached ~1,600 GWh by end-2022. Energy of 1 megaton TNT ≈ 1.162 GWh. 1 GWh = 3.6 TJ = 1,000 MWh = 3.412 × 10⁹ BTU.
Quick Reference Table
| Megawatt-Hours (MWh) | Gigawatt-Hours (GWh) |
|---|---|
| 1 MWh | 0.001 GWh |
| 2 MWh | 0.002 GWh |
| 5 MWh | 0.005 GWh |
| 10 MWh | 0.01 GWh |
| 25 MWh | 0.025 GWh |
| 50 MWh | 0.05 GWh |
| 100 MWh | 0.1 GWh |