In this Thursday, Aug. 17, 2017, file photo, solar tech Joshua Valdez, left, and senior plant manager Tim Wisdom walk past solar panels at a Pacific Gas and Electric Solar Plant, in Dixon, Calif. Higher energy costs led to prices at the wholesale level rising in August 2017 at the fastest pace in four months, according to information released Wednesday, Sept. 13, 2017, by the Labor Department. (AP Photo/Rich Pedroncelli, File)
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