Constellation Energy to restart Three Mile Island nuclear plant, sell the power to Microsoft for AI

Constellation Energy plans to restart the Three Mile Island nuclear plant and will sell the power to Microsoft, the companies announced on Friday.

Constellation expects the Unit 1 reactor at Three Mile Island to come back online in 2028, subject to approval by the Nuclear Regulatory Commission. Unit 1 ceased operations in 2019 and is separate from the reactor that partially melted down in 1979 in the worst nuclear accident in U.S. history.

Microsoft will purchase electricity from the plant to match the energy its data centers consume with carbon-free power. Constellation described the agreement with Microsoft as the largest power purchase agreement that the nuclear plant operator has ever signed.

Constellation stock jumped nearly 7% in early trading.

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