Constellation Energy’s plan to reopen the shuttered Three Mile Island nuclear site in Pennsylvania has cleared another key regulatory hurdle, bringing it one step closer to Nuclear Regulatory Commission approval.
The NRC said Tuesday that restarting the Unit 1 reactor, now called the Crane Clean Energy Center, “would have no significant environmental impacts.”
If the NRC grants final approval, Constellation has said it’s in position to start producing electricity there again by late 2027.
Three Mile Island in Middletown, Pennsylvania, is the site of the infamous Unit 2 partial meltdown in 1979. The other unit continued operating until 2019. But in September 2024, Constellation and Microsoft agreed to reopen Unit 1 through a 20-year power purchase agreement — adding a new source of carbon-free electricity to power Microsoft’s data centers.
