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(Felicia Fonseca | AP file photo) The sunsets behind the coal-fired Navajo Generating Station near Page, Ariz., on Aug. 19, 2... (Susan Montoya Bryan | AP file photo) A coal stockpile at the Navajo Generating Station near Page, Ariz., on Aug. 20, 2019. B... (Felicia Fonseca | AP file photo) The coal-fired Navajo Generating Station near Page, Ariz. is seen Aug. 19, 2019. The power ... (Susan Montoya Bryan | AP file photo) Transmission lines lead from the Navajo Generating Station near Page, Ariz. The power p... (Felicia Fonseca | AP file photo) Peabody Energy silo operator Gerald Clitso talks with coworkers after loading coal into a t... (Susan Montoya Bryan | AP file photo) Navajo Generating Station employee and former mayor Lyle Dimbatt answers questions abou... (Felicia Fonseca | AP file photo) Train operator Ron Little prepares for one of the last trips to pick up coal from the Kayen... (Susan Montoya Bryan | AP file photo) A Navajo Generating Station employee holds a challenge coin that was given to workers a... (Susan Montoya Bryan | AP file photo) Train tracks that serve as an artery between a coal mine near Kayenta, Ariz., and the c... (Susan Montoya Bryan | AP file photo) Employees with Peabody Energy and the Navajo Generating Station talk on Aug. 20, 2019 a... (Susan Montoya Bryan | AP file photo) Kayenta Mine acting general manager Randy Lehn talks about unsuccessful efforts to keep... (Susan Montoya Bryan | AP file photo) Workers talk about the impending closure of the Navajo Generating Station near Page, A... (Susan Montoya Bryan | AP file photo) An electric train pulls into a coal silo that is fed by a mine near Kayenta, Ariz., on ... (Susan Montoya Bryan | AP file photo) A mile-long train leaves a coal silo near Kayenta, Ariz., en route to the Navajo Genera... (Susan Montoya Bryan | AP file photo) A trio of concrete stacks stand at the Navajo Generating Station near Page, Ariz., on A...