Promoting renewable energies - RETS Project

A Quick Guide to Units
Energy
kWh – energy output in kilowatt-hours (i.e. thousands
of watt-hours)
MWh – energy output in Megawatt-hours (i.e. kWh x
1000)
GWh – energy output in Gigawatt-hours (i.e. MWh x
1000)
TWh - energy output in Terawatt-hours (i.e. GWh x
1000)
ktoe – kilotonnes of oil equivalent
(A large energy unit often used with solid and liquid
fuels: 1 ktoe = 11.63 million kWh)
Power – a rate of energy transfer
kW – power transfer in kilowatts (i.e. thousands of
watts)
MW – power transfer in megawatts (i.e. millions of
watts or kW x 1000)
Subscripts
e – electrical
peak – Peak value for a device whose output can vary
e.g. a wind turbine or PV array.
th – thermal
Mtoe – megatonnes of oil equivalent (i.e. ktoe x
1000)
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RETS Compendium – © 2012 RETS Consortium