Constellation Energy has announced plans to revive the dormant Unit 1 reactor at Pennsylvania's Three Mile Island nuclear generating station to cater to the power needs of high-tech data centers. The initiative aims to bring the reactor back into operation and sustain its functioning for several decades. Microsoft has sealed a 20-year agreement with Constellation Energy to purchase power generated by the plant, which will be used to enhance the environmental sustainability of its data centers in the area.

Notably, TMI-1 remained unharmed during the 1979 accident that affected the power station. However, the dire partial meltdown of TMI-2, the station's second reactor, marked the most severe nuclear incident in the history of U.S. commercial nuclear power. The catastrophe ensued following the failure of the reactor core's feed water pumps, causing overheating. As a consequence, a nationwide deceleration in new reactor constructions unfolded, prompting regulatory authorities to reinforce safety regulations within the nuclear power industry.

After being kept offline since 1985 due to economic viability concerns, Constellation Energy is now set to invest in refurbishing TMI-1's systems, including the cooling mechanisms, turbines, and power transformers, to reinstate operational readiness. The company anticipates that the reactivation of the reactor will not only serve data centers but also invigorate local economies. Constellation's CEO, Joe Dominguez, expressed enthusiasm about reviving the plant as a key economic driver for Pennsylvania with a new identity and an enhanced purpose. The proposed restart of the reactor is contingent upon receiving approvals from both local and federal authorities. If approved, the reactor is expected to recommence operations in 2028 and deliver power until at least 2054.