Microsoft has entered into a 20-year power purchase agreement with Constellation Energy to restart a decommissioned unit at the Three Mile Island nuclear facility in Pennsylvania. The deal aims to provide a dedicated source of carbon-free electricity to power Microsoft’s expanding artificial intelligence and data center operations. Unit 1, which is separate from the reactor involved in the 1979 accident, was retired in 2019 for economic reasons and is expected to return to service by 2028 pending regulatory approval. Industry experts describe the move as a major step in the tech industry's search for reliable, 24/7 clean energy. While the project promises significant economic investment and job creation in the region, it remains subject to rigorous safety inspections by the Nuclear Regulatory Commission. Some environmental advocates have expressed caution, citing concerns over nuclear waste and the cost of refurbishing aging infrastructure, while others see it as a necessary compromise to meet urgent climate and energy demands.