Microsoft signs 20-year deal to restart Three Mile Island nuclear plant

Type: Partnership · Technology: Nuclear · Country: United States · Announced: 2026-07-08

Microsoft finalized a 20-year power purchase agreement with the Three Mile Island nuclear plant, marking the first major commercial deal to restart the facility since its shutdown in 2019. The agreement secures a long-term, carbon-free energy supply for Microsoft's data center operations, which are expanding rapidly to support AI workloads. Located in Pennsylvania, the Three Mile Island plant has a historical capacity of 803 MW but requires material refurbishment before resuming operations. The deal positions Microsoft as a key anchor customer for the revived nuclear asset, while the plant's owner seeks to monetize its existing infrastructure. Regulatory approvals and grid interconnection studies are expected to commence in late 2026, with commercial operations targeted for 2028.

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