⚠ Fixed Price Means Somebody Else Keeps the UpsideModerate threat

A twenty-year fixed-price contract transfers the price risk to the buyer and the price opportunity with it. If American power prices rise for two decades — which is what every forecast underpinning Vistra's valuation assumes — then Amazon and Meta will have bought power at a price that looks better every year, and Vistra will have sold it.

This is the actual trade, and it is rarely described that way. The contracting strategy is presented as de-risking, which it is. It is also a decision to sell the most scarce asset the company owns at a price struck when the scarcity was visible but before it was extreme.

Whether that is a good trade depends on something nobody knows: whether the contracted prices embed enough of the future scarcity. The terms are not disclosed. What is disclosed is the direction — Vistra continues to engage with counterparties about additional long-term arrangements¹ — which means more of the fleet is likely to move onto fixed prices.

The asymmetry is worth stating plainly. If demand disappoints, the contracts are worth a great deal and the uncontracted 92% of the fleet suffers. If demand exceeds expectations, the contracts cap the best assets and the uncontracted fleet earns the windfall.

An investor who owns this stock for the AI-power thesis is therefore partly betting against the company's own risk management. The measure that resolves it, slowly, is realised margin on contracted volumes against the prevailing market price once deliveries begin in late 2027.