FILE - This Aug. 19, 2019, file photo shows the coal-fired Navajo Generating Station near Page, Ariz. The three towering concrete stacks are the most visual reminder of a coal-fired power plant that operated for decades in far northern Arizona. On Friday, Dec. 18, 2020, they are scheduled to come down. The 775-foot structures loomed over the Navajo Generating Station, which closed last year. (AP Photo/Felicia Fonseca, file)
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