The surging energy demand from artificial intelligence is breathing new life into one of America’s most infamous nuclear sites. Constellation Energy is targeting a mid-2027 restart for the Three Mile Island Unit 1 reactor, aiming to supply the vast power needed for data centers run by its partner, Microsoft.
The project has received strong backing from the Trump administration, which sees it as a model for American energy innovation. “Pennsylvania is fortunate to have such an amazing set of resources here, and one of those resources, of course, is Pennsylvania’s position in nuclear power, representing over 10% of the power that this country is producing,” U.S. Interior Secretary Doug Burgum said during a site visit in May 2026.
Constellation Energy announced plans in 2024 to revive the plant, now named the Crane Clean Energy Center, which was taken offline in 2019 over economic issues. The plan is anchored by a 20-year power purchasing agreement with Microsoft to match the electricity consumption of its data centers. The project is unprecedented, as no fully shut-down commercial nuclear plant in the United States has ever been brought back online.
This public-private partnership could create a blueprint for powering the AI industry’s explosive growth, which is straining the nation's power grid. However, it also highlights the immense execution risk in a sector littered with ambitious failures. The cautionary tale of Fermi Inc., a startup valued at over $19 billion that collapsed after failing to sign a single client for its proposed 17-gigawatt nuclear-powered AI campus in Texas, underscores the difference between a vision and a viable project.
The AI Power Dilemma
The rapid expansion of AI has created an almost insatiable appetite for electricity. Data centers, the buildings that house the powerful computers for AI applications, can each consume as much power and water as a small town. This has led to protests and, in some cases, proposed legislation to pause new data center construction. In Texas alone, peak electricity demand is expected to quadruple in the next six years, rising by an astonishing 282 gigawatts, largely driven by data center and AI demand.
This demand has pushed energy providers to seek new, reliable power sources. While some, like Elon Musk, have built their own off-grid gas-powered turbines, that solution is out of reach for most companies. The TMI restart represents a different approach: recommissioning existing, carbon-free infrastructure with a guaranteed long-term buyer.
A Tale of Two Nuclear Plans
The contrast between the Three Mile Island project and the recent failure of Fermi Inc. is stark. Fermi, co-founded by former Texas governor Rick Perry, promised a massive 17-gigawatt data center site powered by its own gas and nuclear plants. Despite a peak market value of over $19 billion, the company’s board fired its CEO after it failed to secure any tenants.
Former U.S. Department of Energy official Jigar Shah called Fermi a failure “of monumental proportions” and warned that similar off-grid data center projects deserve more skepticism. Banks are hesitant to finance such ventures because the grid, drawing from many sources, is inherently more reliable than a few on-site plants. The TMI project, in contrast, involves an established energy utility, an existing (though dormant) asset, and a credit-worthy, long-term customer in Microsoft.
Political Will Meets Regulatory Reality
The TMI restart enjoys significant political tailwinds. Interior Secretary Doug Burgum’s visit in May 2026 followed a similar trip by U.S. Energy Secretary Chris Wright in December 2024. Both visits highlighted the Trump administration's prioritization of the project as a cornerstone of its strategy for U.S. dominance in AI.
Despite the high-level support, the project faces a complex regulatory path with the Nuclear Regulatory Commission (NRC), which is reviewing the reopening plan. The partial meltdown of TMI’s Unit 2 reactor in 1979 remains a sensitive point, and some local groups have expressed concern that the project may be moving too fast. The successful restart of Unit 1 would not only be a technical and regulatory first for the U.S. nuclear industry but could also serve as a critical test case for reviving nuclear power as a key energy source for the 21st century’s digital infrastructure.
This article is for informational purposes only and does not constitute investment advice.
