Clean Growth: Technologies for meeting the UK’s emissions reduction targets Contents

Annex 1: Units used in the Report

tCO2e, MtCO2e: The greenhouse effect varies according to the quantity of greenhouse gases in the Earth’s atmosphere. One tonne of CO2-equivalent (tCO2e) refers to one tonne of carbon dioxide, or a quantity of another greenhouse gas that would contribute to global warming to an equivalent degree as one tonne of carbon dioxide. One megatonne of CO2-equivalent (M tCO2e ) is equal to one million tonnes of CO2-equivalent.

W, MW, GW: A Watt (W) is a unit of power, that is the rate of energy produced or consumed at a certain point in time. One Megawatt (MW) is equal to a million Watts and one Gigawatt (GW) is equal to a billion Watts. Power generation capacity can also be measured in Watts, in which case it represents the average or maximum power output that the generation plant can provide. A typical rooftop solar panel might generate a few thousand Watts in the middle of a sunny day, while a nuclear power station might generate a few billion Watts.

Wh, kWh, MWh: One watt-hour (Wh) is a unit of energy, equivalent to the total energy generated or consumed by a 1W device over the course of an hour. One kilowatt-hour (kWh) is equal to one thousand watt-hours and one megawatt-hour (MWh) is equal to one million watt-hours. Since there are 8,760 hours in a year, a 1MW power station would generate 8,760MWh of energy in a year. The average UK household uses around 10kWh of electricity a day, or around 4MWh of electricity each year.

Published: 22 August 2019