Microsoft has signed a groundbreaking 20-year agreement with Constellation Energy to restart a reactor at the infamous Three Mile Island nuclear plant, aiming to meet the growing energy demands of its data centers, particularly for AI technologies. The revived Unit 1 reactor, which was shuttered in 2019 for economic reasons, is expected to generate over 800 megawatts of carbon-free electricity by 2028, pending approval from the U.S. Nuclear Regulatory Commission. This initiative is anticipated to create approximately 3,400 jobs and contribute $16 billion to Pennsylvania's economy. Constellation's CEO emphasized the importance of nuclear power in providing reliable, carbon-free energy essential for the nation's technological competitiveness. The reopening reflects a broader trend in the nuclear sector as it rebounds from past safety concerns, aiming to support the increasing electricity needs of modern industries. The deal comes amid significant financial optimism, boosting Constellation's stock significantly following the announcement.