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Coal
0.4400 kg CO2e per kwh
Hard coal in 5 mW furnace
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Fuel Oil
0.3100 kg CO2e per kwh
Light fuel oil in 2mW industrial furnace
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Geothermal
0.0300 kg CO2e per kwh
10kW geothermal probe
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Hydroelectric
0.0110 kg CO2e per kwh
Andronomous, fish disruption
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Natural Gas
0.2500 kg CO2e per kwh
Natural gas in 100kW boiler
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Nuclear
0.0080 kg CO2e per kwh
Excluding weapons proliferation risk
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Solar Electricity
0.0370 kg CO2e per kwh
Photovoltaics on a sloped roof, excluding batteries
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Solar Heat
0.0095 kg CO2e per kwh
Solar hot water
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US Electric Grid
0.8200 kg CO2e per kwh
US average with distance loss
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Wind
0.0110 kg CO2e per kwh
Horizontal axis wind turbine
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Wood
0.0180 kg CO2e per kwh
hardwood chips in 300kW furnace