This summer, odds are 40% that any light switch in the U.S. is powered by natural gas—or, as the grid is source-indifferent, that 40% of the power is derived from natural gas. That’s up from a 35% chance during the summer of 2015 and 14% in 1997, according to the U.S. Energy Information Administration (EIA).

Odds that power’s coming from wind, solar and other non-hydro renewables are 9%, with wind’s share alone being 6%, up from less than 1% in 1997. As for coal, there’s a 25% chance, down from 28% last summer.

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