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U.S. Department of Energy loans $1 billion to restart nuclear reactor on Three Mile Island

Nov 18, 2025, 8:16 PM40
(Update: Nov 19, 2025, 1:00 AM)
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U.S. Department of Energy loans $1 billion to restart nuclear reactor on Three Mile Island

  • The U.S. Department of Energy announced a $1 billion loan for the Three Mile Island nuclear plant restart.
  • This initiative aims to support Constellation Energy in providing power to Microsoft data centers.
  • The reactor's revival marks an important step in reenergizing the nuclear power sector in the U.S.
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In the United States, the Department of Energy announced a significant financial move to support the nuclear energy sector by approving a loan of $1 billion to Constellation Energy. This funding is aimed at restarting the nuclear power plant located on Pennsylvania's Three Mile Island, which has remained non-operational for five years. Under a 20-year agreement with Microsoft, the plant is expected to supply power to the tech giant’s data centers when it comes back online. The reactor, which has a capacity of 835 megawatts, is suggested to potentially power around 800,000 homes, amplifying its significance in energy production. The nuclear power plant, infamous for the 1979 accident that rendered one of its reactors inoperative, currently has just one functioning reactor, Unit 1, following the shutdown of Unit 2. The initiative to restart the reactor aligns with the energy priorities set forth by the Trump administration, focusing on advancing nuclear power and integrating it with modern technological demands such as artificial intelligence. It seeks to alleviate power supply stress exacerbated by increasing energy demands from data centers across the nation. Constellation Energy has initiated plans costing approximately $1.6 billion to make the necessary restorations to the plant's equipment, which includes the turbine, generator, and control systems. By securing federal financing, the company can lower its financing costs, ultimately facilitating the complex process of bringing the plant back to operational status by the projected year of 2027. The combined effort of governmental support and corporate investment aims to rejuvenate the plant while bolstering the overall energy infrastructure, fostering a fresh era for the nuclear sector and addressing climate concerns. This initiative reflects a broader trend where policymakers are recognizing the importance of nuclear power as a steady and reliable source of energy, especially in the context of mitigating climate change impacts and meeting the growing energy requirements of modern technology and society at large. Additionally, the historical challenges faced by the site only underline the significance of this revival effort.

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