A Monday, May 22, 2017, file photo shows cooling towers at the Three Mile Island nuclear power plant in Middletown, Pennsylvania. Exelon Corp., the owner of Three Mile Island, site of the United States' worst commercial nuclear power accident, said Monday, May 29, 2017, it will shut down the plant in 2019 unless it receives a financial rescue from Pennsylvania. (AP Photo/Matt Rourke, File)
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