Constellation Energy (NASDAQ: CEG) and Vistra (NYSE: VST) are the two dominant forces in U.S. nuclear power, both racing to capitalize on surging electricity demand from AI data centers.
Constellation generates revenue by producing and distributing electricity across multiple U.S. markets, managing a large portfolio of nuclear, wind, and solar generation assets.
The company serves utility distributors, commercial enterprises, and everyday household consumers, and recently filed regulatory applications to extend the operational life of multiple energy plants.
Constellation also continues to secure long-term power purchase agreements, and reported a net margin of 7% in the quarter ended June 30, 2026.
Vistra earns revenue through a combination of retail electricity supply operations and extensive power generation activities, managing natural gas, nuclear, and battery storage facilities across multiple states.
Vistra reported an operating margin of around 14% for the quarter ended June 30, 2026, while also launching a joint entity to finance digital infrastructure projects.
Revenue figures tell a clear story: Constellation posted $11.1 billion in Q1 2026 and $7.5 billion in Q2 2026, far outpacing Vistra’s $4.7 billion and $4.0 billion in the same periods.
Constellation’s dramatic revenue jump in early 2026 is directly attributable to its acquisition of Calpine, which closed in early 2026 and substantially expanded its generation footprint.
Vistra’s revenue has been notably lumpier, partly because the company uses energy derivatives to hedge power prices, booking gains and losses based on commodity price fluctuations.
Both companies are running a similar strategic playbook, leaning on nuclear assets to serve the AI data center build-out while simultaneously bulking up on natural gas to add flexible capacity more quickly.
While Constellation absorbed Calpine, Vistra is set to acquire gas plants from Cogentrix Energy, signaling that both companies see natural gas as an essential complement to their nuclear operations.
Both companies carry significant exposure to major wholesale power markets, including the Electric Reliability Council of Texas (ERCOT) and PJM, where prices are driven by supply and demand dynamics.
That market exposure offers greater upside potential compared to traditional regulated utilities, making both stocks compelling bets on the continued growth of AI-driven electricity demand.
Constellation is the larger, faster-growing company integrating a massive acquisition, while Vistra is the smaller but more capital-return-focused of the two, targeting at least $1 billion in annual share repurchases.
For investors tracking the AI energy trade, Constellation’s scale and revenue momentum currently give it a clear edge, though Vistra’s capital discipline and margin profile remain notable competitive strengths.
