1.0 Oil
1.1 Conventional oil
1.2 Enhanced recovery, shale oil and tar sands

2.0 Gas
2.1 Conventional gas

3.0 Solids
3.1 Coal
3.2 Biomass

4.0 Resource-constrained renewables
4.1 Hydro, geothermal

5.0 Nuclear

6.0 Solar (ex. Biomass)

6.1 Solar electric (other solar is associated with conservation), wind, and tidal power,

ocean thermal energy conversion, fusion and other advanced renewable technologies.