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Arizona Public Service chairman and CEO Jeff Guldner poses for a portrait Tuesday, Jan. 21, 2020, in Phoenix. Arizona's largest electric utility announced that it plans to switch to 100% carbon-neutral power generation by 2050, with a goal in 10 years of hitting the 65% mark. (AP Photo/Ross D. Franklin)

Arizona Public Service chairman and CEO Jeff Guldner poses for a portrait Tuesday, Jan. 21, 2020, in Phoenix. Arizona's largest electric utility announced that it plans to switch to 100% carbon-neutral power generation by 2050, with a goal in 10 years of hitting the 65% mark. (AP Photo/Ross D. Franklin)

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