Nathan Howard for The New York TimesIn California, electric vehicles could soon account for 10 percent of peak power demand. AP Photo/Mike StewartIn interviews, utility executives say gas is needed to back up wind and solar power, which don’t run all the time. Gas plants can sometimes be easier to build than renewables, since they may not require new long-distance transmission lines. “It’s going to take a diversified fleet.”Mr. Mitchell noted that Georgia Power was planning a large build-out of solar power and batteries over the next decade and would offer incentives to companies to use less power during times of grid stress. The tech companies and manufacturers that are driving up electricity demand could also play a major role, experts say.

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