Classification of fuel type
1. - Total primary and secondary energy
1.1 - Primary energy
'Primary energy fuel types are energy commodities that are either extracted or captured directly from natural resources.'
1.1.1 - Total coal
1.1.2 - Crude oil
1.1.3 - Natural gas
1.1.4 - Gas plant natural gas liquids (NGL's)
1.1.5 - Primary electricity, hydro and nuclear
1.1.6 - Renewable fuels
Fuel ethanol, biodiesel, and renewable diesel fuel.'
1.1.7 - Steam
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