Trump DOE gives Microsoft partner $1B loan to restart Three Mile Island reactor

The Trump administration will provide Constellation Energy a $1 billion loan through the DOE Loan Programs Office to restart Three Mile Island Unit 1 (835 MW), a plant idled in 2019; Constellation estimates the refurbishment will cost $1.6 billion and finish in 2028, and Microsoft has committed to buy the plant’s output for 20 years. Jefferies estimates Microsoft may be paying roughly $110–$115/MWh — cheaper than building a new reactor but materially above wind, solar, geothermal and battery-backed renewables — reflecting tech firms’ willingness to pay a premium for 24/7 carbon-free baseload to support data-center and AI demand, a trend echoed by Meta’s recent nuclear deal. The loan, routed via the LPO’s Energy Infrastructure Reinvestment program (now rebranded as the Energy Dominance Financing Program), underscores continued federal de-risking of nuclear restarts and could catalyze further offtake-backed refurbishments, even as economics versus cheaper renewables remain a strategic trade-off for investors.

Analysis

The Trump administration will provide Constellation Energy a $1 billion loan via the Department of Energy’s Loan Programs Office to restart Three Mile Island Unit 1, an 835 MW reactor idled in 2019, with Constellation estimating a $1.6 billion refurbishment to be completed in 2028. Microsoft has committed to buy all output for 20 years, and Jefferies estimates the implicit price is roughly $110–$115/MWh, a level Jefferies and Lazard note is cheaper than building a new reactor but materially above wind, solar and battery-backed renewables. The financing uses the LPO’s Energy Infrastructure Reinvestment vehicle (rebranded as the Energy Dominance Financing Program), which has a 3.3% historical default rate after recoveries and a recent precedent of a $1.6 billion LPO loan to AEP for transmission upgrades. The transaction signals continued federal de-risking of nuclear restarts and a strategic premium tech firms are willing to pay for 24/7 carbon-free baseload to power data centers and AI, but it leaves execution, disclosed contract terms and competitive pressure from cheaper renewables as key downside risks.

Key Decisions for Investors

• Consider a modest, conviction-weighted exposure to Constellation Energy (CEG) given the $1 billion LPO backstop and Microsoft offtake but limit size until refurbishment milestones and full offtake terms are disclosed
• Evaluate opportunities in grid and infrastructure beneficiaries (e.g., companies involved in transmission and plant refurbishment) if federal de-risking of nuclear continues, while sizing positions for regulatory and execution risk
• Monitor published offtake pricing and Lazard cost comparisons closely because the estimated $110–$115/MWh premium vs. wind/solar+storage is the core sensitivity that could affect long-term project economics
• Use event-driven hedges or tighter risk controls to protect portfolios against schedule slippage to 2028 or cost overruns given the $1.6 billion estimate and historical refurbishment risk