Three Mile Island, long defined by its place in America’s nuclear history, is moving back into the energy business with a new mission: powering the AI boom.

A long-term agreement signed in September 2024 ties Microsoft Corp. to the site’s output for two decades, according to the news signal. Under that deal, Constellation Energy Corp. will supply all electricity from the location’s remaining functional 835-megawatt reactor to support chatbots and other artificial intelligence applications. The project also arrives with a new identity, the Crane Clean Energy Center, a name that seeks to separate the facility’s future from decades of public baggage.

The revival of Three Mile Island shows how quickly AI’s hunger for electricity is reshaping the power market.

Key Facts

  • Three Mile Island is poised to return under the name Crane Clean Energy Center.
  • Microsoft agreed to buy the site’s full electricity output for 20 years.
  • The remaining reactor produces 835 megawatts of power.
  • The electricity will support chatbots and other AI applications.

The comeback says as much about technology as it does about energy. AI systems demand vast, steady supplies of electricity, and that need has pushed major companies to look beyond intermittent sources toward generation that can run around the clock. Nuclear power fits that requirement, and reports indicate the Three Mile Island deal now stands as one of the clearest examples of Big Tech locking in long-term power for AI infrastructure.

The site’s history still matters. Three Mile Island remains one of the most recognizable names in U.S. nuclear power, and any revival will draw scrutiny from regulators, local communities, and investors. Still, the agreement suggests that for Microsoft and Constellation, the urgency of securing reliable electricity outweighs the reputational risks attached to the location’s past.

What happens next will reach beyond one Pennsylvania plant. If this restart moves forward as planned, it could strengthen the case for keeping existing nuclear assets online, reviving dormant capacity, and tying more power deals directly to data centers and AI growth. The bigger story sits in plain view: as AI expands, the fight to secure constant, large-scale electricity may reshape the energy map just as much as the technology reshapes the economy.