These are the energy densities of various fuels commonly used in Ireland, collected from various sources.
Electricity - 3.6 MJ/kWh
Wood chips (@50% Moisture) - 9.5 MJ/kg
Wood - 11 MJ/kg
Sod Peat (Turf) - 12.8 MJ/kg
Coal (Lignite) - 14 MJ/kg
Wood chips (@25% Moisture) - 14.3 MJ/kg
Wood pellets - 16.8 MJ/kg
BNM Briquettes - 17.7 MJ/kg
Coal (Bituminous) - 20 MJ/kg
Coal (Anthracite) - 32.5 MJ/kg
Biodiesel (veg oil) - 33 MJ/L
Petrol - 34.2 MJ/L
Diesel (Fuel Oil) - 37.3 MJ/L
Natural Gas - 38.7 MJ/m3
Sources:
Wikipedia - Energy Density
Green Building Magazine - Wood pellets - a fuel for the 21st century
Bord na Mona - Peat for Energy (pdf)
Natural Gas (Australia) - References
To convert from MJ to BTU, multiply by 947.82.
I'm searching for figures for some of the newer fuel products such as miscanthus logs and compressed wood logs such as Ecoflame from Stafford Fuels.
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