Constellation Energy (CEG) Passes Another Regulatory Hurdle For Three Mile Island Nuclear Plant
1 min read
The story
Constellation Energy (CEG) has passed an additional regulatory checkpoint in the process of restarting Three Mile Island Unit 1, the Pennsylvania plant that ceased operations in 2019. The restart is backed by a landmark 20-year power purchase agreement with Microsoft, which is seeking reliable carbon-free baseload power for its data center buildout. With FY2025 revenue running at $25.5B (+8.3% YoY) and a 9.1% net margin, CEG's financials already reflect its dominant position in U.S. nuclear generation, but the TMI restart represents incremental contracted cash flow not yet fully baked into consensus.
The setup now hinges on whether remaining regulatory steps proceed on schedule and whether the Microsoft PPA economics hold as the energy market evolves. Key watch items include the final NRC license amendment, the timeline to commercial operation, and any competing clean energy supply offers that could pressure PPA pricing. The market has broadly priced in a successful restart, so the angle is narrower than it was at announcement — further upside is execution-dependent.
The case — both sides
The TMI restart, once fully approved, locks in 835 MW of contracted carbon-free baseload power under a 20-year Microsoft PPA at premium rates, providing durable earnings visibility that is not yet fully reflected in CEG's 9.1% net margin baseline.
CEG's stock has already appreciated significantly on TMI restart expectations, meaning a successful final approval may be a 'sell the news' event if the incremental EPS uplift from the contract is modest relative to the current valuation multiple.
The house read
Leans bullCEG clears another TMI restart hurdle — the question is whether remaining regulatory risk is already priced out or if the stock still has room to re-rate as each milestone is checked off.
Wrong ifA delay or denial at the final NRC license amendment stage, or a renegotiation/cancellation of the Microsoft PPA, would unwind the restart premium sharply; broader power price softness could also reduce the perceived value of new long-duration nuclear contracts.
Published read · research, not advice