Resource efficiency with useful heat or electricity

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(SE) One way to determine which energy source that is best for the environment is to assess the benefit in the form of heat or electricity a power source can provide. The tables below can be read as 1 unit of fuel provides x heating and y electricity. Higher number is better.

Note that "useful heat out" greater than 100 means that the end result is more heat energy than if the fuel were burned directly for heating.

All types of power

Power source
100% in		 % Electricity out % Heat out % Useful heat out
with HP COP 4		 Net effect electricity contribution
by % of fuel energy in
Direct combustion for heating
(wood burning, pellets, oil, gas)		 0 100 100 25
Internal combustion engine with gas/liquid fuel
(Gen set)		 35 0 140 35
Solid fuel in condensation power plant 40 0 160 40
Combustion engine with gas/liquid fuel with district heating 35 65 205 51
Solid fuel in cogeneration plants 40 60 220 55
Gas/liquid fuel in gas combined cycle power plant without district heating 60 0 240 60
Gas/liquid fuel in gas combined heat and power plants with district heating 60 40 280 70

Electric car compared to ICE petrol car

An electric car cuts carbon dioxide emissions in half compared to a petrol car if the electricity is produced with petrol.

If gasoline is used in a car engine, a maximum of 30% can become electricity = kinetic energy under optimal conditions.

If gasoline is used to produce electricity in a gas combined cycle power plant with a combined cycle, you can get about 60% electricity = kinetic energy.

Solid fuels

Power source
100% in		 % Electricity out % Heat out % Useful heat out
with HP COP 4		 Net effect electricity contribution
by % of fuel energy in
Direct combustion for heat
(wood burning, pellets, oil, gas)		 0 100 100 25
Solid fuel in condensation power plant 40 0 160 40
Solid fuel in cogeneration plants 40 60 220 55


Gas and liquid fuels

Power source
100% in		 % Electricity out % Heat out % Useful heat out
with HP COP 4		 Net effect electricity contribution
by % of fuel energy in
Direct combustion for heat
(wood burning, pellets, oil, gas)		 0 100 100 25
Internal combustion engine with gas/liquid fuel
(Gen set)		 35 0 140 35
Combustion engine with gas/liquid fuel with district heating 35 65 205 51
Gas/liquid fuel in gas combined cycle power plant without district heating 60 0 240 60
Gas/liquid fuel in gas combined heat and power plants with district heating 60 40 280 70
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