23 States to Rely on Geothermal, Solar, or Wind Power as a Primary Source of Electric Generation in 2016
At the end of the 20th century, electric generation in the U.S. came primarily from five sources; coal, nuclear, natural gas, petroleum, and hydroelectric. In 1999, 45 states relied on three of those five energy sources for their top three sources of electric generation. The exception was five states, which had biomass in their top three. There wasn’t much energy diversity in electric generation back then.