Here, in Arizona, about half (46%) of our electricity is still generated by natural gas, but nuclear also is a major source (27%). Coal is fast dwindling, as coal fired plants and coal mines shut down, primarily because coal plants cost so much to operate and coal is an expensive and dirty fuel. Solar, in fact is outpacing coal now, and we generate a reasonable share from wind (fast expanding) and hydro.
In the U.S., as a whole, natural gas makes up about 43% of the supply, while coal still supplies about 15%, but that number is dropping quickly. Renewables are up to about 30%, while nuclear is around 10%. Natural gas is still being used because it's currently cheap and plentiful. Oil supplies only a fraction of a percent of all electricity production.

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