Vistra (VST) has declined 16.3 percent over the past twelve months while the S&P 500 returned 17.1 percent. The underperformance is puzzling given second-quarter 2026 adjusted EBITDA jumped more than 30 percent year-over-year. Yet the market's caution is warranted: Vistra trades at 25.3 times earnings versus the S&P 500's 21.5 multiple, despite operating margins of only 19.4 percent—barely above the index's 18.5 percent.
Management is banking on future growth. During its August 7 earnings call, Vistra guided 2026 adjusted EBITDA to $6.8 billion to $7.6 billion and said it could hit or exceed the midpoint. Long-term power purchase agreements with Meta and other customers are priced above current market rates. In September, New Era Energy signed a 20-year contract for a Vistra affiliate to supply at least 200 megawatts to its Texas data center.
But there's a catch. The company is also pursuing $4.2 billion in federal loans for nuclear generation—debt that will increase an already-heavy leverage profile. Vistra's debt represents 35.4 percent of market value, well above the S&P 500's 21.4 percent average. This higher leverage amplifies downside risk if earnings disappoint.
The bigger threat is Texas. During the August call, executives acknowledged that forward ERCOT prices had fallen materially from October 2025 levels—the basis for Vistra's original 2027 guidance. Yet management maintained its 2027 adjusted EBITDA target of $7.4 billion to $7.8 billion at midpoint, citing hedging programs and stronger pricing in PJM, its other major power market.
This is the critical question: Do hedges and PJM really offset the ERCOT deterioration? Vistra will answer during third-quarter earnings. A maintained or raised 2027 outlook would vindicate the 25.3x multiple. A cut would expose how much the stock's premium valuation depends on Texas pricing that may not materialize. Investors should wait for Q3 guidance before chasing VST on growth expectations alone.
