CEG vs VST — which stock performed better?

Constellation Energy Corporation (CEG) versus Vistra Corp. (VST), Utilities, on 2026-08-10.

Result

Vistra Corp. (VST) performed better on 2026-08-10. CEG moved 0.390%, VST moved 1.800%.

Why these two companies

Vistra posted second-quarter 2026 results before the open on Friday, August 7, with revenue of $4.02 billion missing the $5.73 billion Wall Street consensus even as adjusted EBITDA jumped more than 30% to $1.77 billion, and shares slid on the print. That earnings reaction lands right in the middle of an already-hot debate over which AI-power utility is the better bet, with Constellation Energy - fresh off closing its Calpine acquisition and fielding roughly 31,676 MW of generation - constantly pitted against Vistra as the two largest publicly traded plays on nuclear and gas power for data centers. With one half of the pair having just reported and the other still awaited, Monday's session is a live test of that rivalry.

The research

Constellation Energy runs the country's largest fleet of nuclear power plants and recently got even bigger by buying Calpine, a major natural-gas power producer, giving it one combined fleet with about 31,676 megawatts of generating capacity. Vistra is a Texas-based power company that generates electricity from a mix of natural gas, nuclear, coal, solar and batteries, and sells it to millions of homes and businesses.

One reason to like Constellation is its nuclear-heavy fleet, which many investors see as a long-term winner from rising electricity demand tied to AI data centers. One reason to like Vistra is that even after missing revenue expectations in its latest earnings report, the part of its business that measures actual cash profit still grew more than 30% from a year ago, and management kept its full-year outlook unchanged.

Something to keep in mind about Vistra: its stock reacted negatively on August 7, 2026 after quarterly revenue came in well below what analysts expected, a reminder that these power stocks can be volatile around earnings even when the underlying business is healthy. Something to keep in mind about Constellation: its heavy reliance on nuclear plants means any unexpected plant outage or a tough decision from federal nuclear regulators could move the stock, and digesting the newly acquired gas plants from Calpine adds its own execution risk.

Both companies are widely discussed together as the two biggest ways to invest in rising electricity demand from artificial intelligence and data centers, and financial writers are actively debating which one is the better buy right now - there is no clear consensus winner.