Why Is Vistra (VST) Stock Moving Today?

Vistra is one of the largest independent power producers in the United States, operating a mixed fleet of nuclear, natural gas, coal, and battery storage generation alongside a retail electricity business. Because that generation fleet sits close to data center demand, the stock has become one of the market's most-watched proxies for how fast electricity demand is growing as AI infrastructure gets built out — which is why its earnings and guidance updates move the stock even when the headline numbers look mixed.

For the second quarter of 2026, Vistra reported adjusted earnings per share of $1.68, below the $2.05 analyst estimate, and revenue of $4.02 billion, below the $5.73 billion estimate and down 5.5% from $4.25 billion in the same period last year. Read on the top line alone, that's a clear miss on both counts.

The number that mattered more to the reaction was underneath the top line. Adjusted EBITDA rose 30.8% year over year to roughly $1.8 billion, driven by the generation segment, where EBITDA was up 67.6% from a year earlier — a sign that the underlying power business is running hotter even as consolidated revenue came in below estimates. Vistra reaffirmed its full-year 2026 guidance of $6.8 billion-$7.6 billion in adjusted EBITDA and $3.93 billion-$4.73 billion in adjusted free cash flow before growth spending, and management said the company remains on track for a record 2026, expecting results at or above the midpoint of that guidance.