Power lines come off of the nuclear plant on Three Mile Island. Andrew Caballero-Reynolds/AFP/Getty Images/File Reuters —

The Trump administration said on Tuesday it has loaned Constellation Energy Corp $1 billion to restart its nuclear reactor at a Pennsylvania plant formerly known as Three Mile Island.

Constellation signed a deal in late 2024 with Microsoft to restart the 835-megawatt reactor, which shut in 2019, and which would offset Microsoft’s data center electricity use. The other unit at the plant, renamed the Crane Clean Energy Center, shut in 1979 after an accident that chilled the nuclear power industry.

U.S. power demand is now rising for the first time in two decades on technologies including artificial intelligence. Nuclear energy, which is virtually carbon-free

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