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Energy provider Constellation's plans to restart a nuclear reactor on Three Mile Island in Pennsylvania reflects increasing data center power needs from artificial intelligence — and analysts say it signals how that industrial real estate could prompt more use of nuclear power.

The Baltimore-based energy producer signed a 20-year power purchase agreement with technology giant Microsoft to spend $1.6 billion to restart Three Mile Island Unit 1 that had been closed since 2019 as high operating costs made it unprofitable. The deal will add 835 megawatts of nuclear power to the grid, or enough to power about 700,000 houses.