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They are cheap and clean, but the energy they produce are too miniscule for a entire nation to run upon. So according to the info i can find 80-90% of the world's energy source is created but fossil fuel combustion, which the big 3 are: Coal, Oil and Natural gas. So of the 15% or so remaining: Nuclear, Biomass, Hydro, Solar, Geo Thermal and Biofuel.

Yeah, you're gonna need a lot of windmills :)