Before it was shut down for economic reasons in 2019, the Three Mile Island Reactor, which will be renamed Crane Clean Energy Center, had a generating capacity of 837 megawatts, enough to power 800,000 homes, Constellation said. The reactor is expected to go back online in 2028 and Microsoft has agreed to a 20-year power purchase agreement.

Microsoft just signed a deal to revive the shuttered Three Mile Island nuclear power plant. If approved by regulators, the software maker would have exclusive rights to 100 percent of the output for its AI data center needs.