Units of Energy
Kilowatt-hour (kWh), Megawatt-hour (MWh), Gigawatt-hour (GWh)
Energy = power x time
Thus a kilowatt-hour is the energy of a 1kW device running for 1 hour or a 100W device running for 10 hours.
Megawatt-hour = 1000 kWh, Gigawatt-hour = 1000 MWh
Units – Greenhouse Gas Emissions
Tonnes of Carbon (tC)
Unit used to express the carbon content of greenhouse gas emissions that facilitates easy comparison of different greenhouse gases with different carbon content. One tonne of carbon is equivalent to 3.7 tonnes of carbon dioxide, the most important greenhouse gas.