Constellation Energy is restarting Three Mile Island Unit 1 — rebranded as the Crane Clean Energy Center — under a 20-year 837 MW PPA with Microsoft signed in September 2024. The $1.6 billion restart project is backed by a $1 billion DOE federal loan awarded in November 2025. The plant was shut down in 2019 for economic reasons after safe operation since 1974. 100% of power goes to Microsoft to match its data centre energy use in Pennsylvania, Chicago, Virginia, and Ohio. Constellation will pursue a licence renewal extending operations to at least 2054. Expected online in 2028. This was the first large-scale nuclear power purchase agreement signed by a hyperscale technology company, widely credited with triggering a wave of similar nuclear procurement by Amazon, Google, and Meta. The DOE loan guarantee, extended in November 2025, marked the first application of DOE loan financing to a US nuclear plant restart; then-Energy Secretary Chris Wright said the approach was expected to extend to the first five to ten new reactors deployed under the administration's nuclear program. On June 16, 2026, FERC approved a crucial transmission waiver addressing severe interconnection bottlenecks for the restart, confirmed by NEI Magazine, clearing a key regulatory hurdle toward the 2027-2028 restart timeline.