(This Sept. 23 story has been corrected to say that Unit 1 was shut down due to 'economic reasons,' not 'operational issues,' in paragraph 4) (Reuters) - Microsoft is estimated to pay Constellation Energy a premium as part of a long-term power purchase agreement (PPA) related to the Three Mile Island nuclear plant in Pennsylvania,

A newly inked 20-year power purchase agreement (PPA) between Constellation Energy Corp. and Microsoft is set to pave the way for the launch of a new clean energy center in Pennsylvania and the restart of

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