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Renewable electricity provided just shy of 100% of California’s electricity demand on Saturday, a record-breaker, officials said, much of it from large amounts of solar power now produced along Interstate 10, an hour east of the Coachella Valley.

Environmentalists over the weekend celebrated as an official online supply tracker surged to 101%, but a power official said late Monday that they had doublechecked the data, and adjusted it slightly due to battery charging and reserves and other resource needs.

While partygoers celebrated in the blazing sunshine at the Stagecoach music festival, energy demand statewide hit 18,672 megawatts at 2:45 p.m., “and at 2:50, we reached 99.87% of load served by all renewables, which broke the previous record … of 97.58%,” said Anna Gonzales, spokeswoman for California Independent System Operator, or CAISO, a nonprofit that oversees the state’s bulk electric power system and transmission lines.