ERCOT scarcity pricing, explained.

ERCOT runs an energy-only market: generators are paid for the electricity they sell, not for standing ready. When reserves run short, prices are allowed to climb steeply — by orders of magnitude in the tightest hours — because scarcity itself is the signal that pays for new capacity. For a data center served from the grid, that means the cost of power is never fully knowable in advance. Firm contracts and behind-the-meter generation exist to take that exposure off the table.

How an energy-only market works

Most U.S. power markets pay generators twice: once for energy, and again through a capacity market — payment for existing and standing by. ERCOT pays only for energy. There is no capacity market and no guaranteed standby revenue, so the incentive to build and maintain generation comes entirely from the price of electricity in the hours it is scarce. The market is designed to let those hours get expensive. That is not a flaw; it is the mechanism.

What scarcity does to the price

In ordinary hours, ERCOT prices track fuel cost and little more. When demand approaches available supply — a heat wave, a hard freeze, plants offline — administrative scarcity mechanisms lift the price toward a cap set far above everyday levels. Prices can move by orders of magnitude within an afternoon and stay elevated as long as reserves stay thin. A year of a generator's profit, and a consumer's pain, can concentrate into a handful of days.

What it means for a grid-served data center

A large load buying at market prices carries a cost line that is stable most of the year and violently unpredictable at the margins. Budgeting becomes probabilistic. Worse, the scarce hours arrive exactly when a data center least wants to choose between extraordinary prices and curtailing compute. Some loads monetize flexibility by backing down into scarcity; an AI facility running contracted workloads usually cannot. It ends up a price-taker in the very hours the market was designed to make expensive.

Taking the load off the market

The exposure disappears when the power does not come from the market. A firm, contracted supply — fixed terms, defined availability — converts volatile spot exposure into a known cost of goods. Behind-the-meter generation goes further: the load never touches the wholesale market at all, so scarcity pricing becomes something that happens to other people. The full cost comparison is in behind-the-meter vs grid: the cost math; how large loads end up waiting for grid service in the first place is in the ERCOT queue, explained.

About Corley Energy

Corley Energy is a behind-the-meter independent power producer, founded in 2024 by Jake Corley, Tim Bozeman, and Mark Meyer. We convert stranded Permian Basin natural gas into firm, contracted electricity for AI data centers at Power Foundry, our ~1,000-acre development in Upton County, Texas. Start with what a power foundry is, see the company facts, or check current capacity on the Sites page.

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