Constellation Energy Corporation (NASDAQ:CEG) and Vistra Corp. (NYSE:VST) are two of the clearest public-market bets on AI electricity demand. Constellation trades near 21 times forward earnings, while Vistra trades around 13 times. The question is whether Constellation’s nuclear scarcity deserves a premium of that size.
The valuation gap has been visible for months, but Peter Thiel’s fund disclosed a $59 million Vistra stake while the stock was still trading at a discount to Constellation. Both companies can benefit from data centers competing for firm power, but their assets and shareholder economics are different enough to make the comparison useful.
Constellation owns the scarcer asset
Constellation Energy Corporation operates the largest nuclear fleet in the United States, giving it long-duration baseload generation that hyperscalers increasingly value for reliability and carbon goals. In the second quarter, adjusted operating EPS reached $2.55, management raised full-year adjusted EPS guidance to $11.50 to $12.50, and the company added roughly 920 megawatts of long-term power agreements.
That scarcity supports the bull case. Fixed-price contracts can convert nuclear scarcity into visible earnings instead of leaving shareholders dependent on higher spot power prices. A hyperscaler signing a long-term nuclear contract can make future cash flows more visible and reduce exposure to commodity power prices. The bear case is that investors already know this. A roughly 21 times forward earnings multiple leaves less room if new data-center contracts arrive more slowly, Calpine integration disappoints, or power-market enthusiasm cools.
Vistra offers more cash flow for each valuation dollar
Vistra Corp.’s second-quarter ongoing operations adjusted EBITDA rose 31% to $1.77 billion. Management maintained 2026 adjusted EBITDA guidance of $6.8 billion to $7.6 billion and adjusted free cash flow before growth guidance of $3.93 billion to $4.73 billion. The company was also approximately 100% hedged for 2026 generation, 94% for 2027 and 72% for 2028.
Vistra therefore gives investors a lower multiple, meaningful cash-flow visibility and exposure to nuclear, gas and retail power. That diversification is also its weakness. Constellation’s nuclear-heavy fleet is a cleaner scarcity asset, while Vistra remains more exposed to commodity markets, hedging decisions and a broader mix of generation.
Q2 hedge-fund positioning favors Vistra on both direction and breadth. Insider Monkey tracked 111 Vistra holders, up from 106 in Q1, and Appaloosa increased its stake about 10% to 2.22 million shares. Constellation fell to 73 holders from 79; Alkeon Capital trimmed its position about 7%. Vistra short interest was 10.78 million shares on August 31, 3.24% of float with 2.7 days to cover.
Constellation has the stronger asset moat. At current prices, Vistra offers the better risk-adjusted stock because its valuation asks investors to pay much less for an AI-power thesis that is already producing substantial cash flow.
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