New York/San Francisco — Natural gas is getting edged out of power markets across the US by two energy sources that, together, are proving to be an unbeatable mix: solar and batteries. In just the latest example, First Solar won a power contract to supply Arizona’s biggest utility when electricity demand on its system typically peaks, between 3pm and 8pm. The panel maker beat out bids from even power plants burning cheap gas by proposing to build a 65-megawatt solar farm that will, in turn, feed a 50-megawatt battery system.

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