Why There Is No ERCOT Capacity Market, and How Texas Differs From Other Grids

The Electric Reliability Council of Texas (ERCOT), which runs the grid for most of Texas, pays power plants only for the electricity they actually produce. Grids like PJM also pay plants to be available. That is why Texas businesses don't see a capacity charge on their bills, and why their energy prices behave differently.

What does a capacity market pay for?

In most other regions, the grid operator holds an auction years in advance. Power plants bid to promise they'll be available during peak demand. The winning price becomes a capacity charge that every business pays, whether or not the grid ever calls on that backup power.

This is how PJM (the grid operator for Pennsylvania, New Jersey, Maryland and 10 other states) and MISO (the Midcontinent Independent System Operator) fund reliability. It's a large and growing share of commercial bills in those regions. Our capacity charge explainer covers how that charge is calculated.

How does Texas pay for reliability instead?

ERCOT runs what's called an energy-only market. Plants earn money by selling electricity, and nothing else. There's no separate payment for standing by.

To give plants a reason to build and stay online, ERCOT lets wholesale prices rise sharply when supply gets tight. A tool called the Operating Reserve Demand Curve adds a price bump as backup reserves run low. The idea is simple. A few hours of very high prices are supposed to earn plants enough to cover a year of costs, and that signal is supposed to attract new supply where it's needed. ERCOT's own resource adequacy assessment looks at how well that design supports enough supply as demand grows.

Why can Texas run its grid differently?

ERCOT's grid is mostly isolated from the rest of the country, and it operates almost entirely within one state. Because of that, federal regulators at the Federal Energy Regulatory Commission (FERC) don't oversee its wholesale market the way they oversee PJM or MISO. Texas regulators at the Public Utility Commission of Texas make those decisions instead. That independence is why Texas can choose its own market design. 

How does ERCOT compare to other grid operators?

• ERCOT: energy-only, with no capacity charge. Price spikes do the work instead.

• PJM: runs a capacity auction, and recent results have pushed capacity costs sharply higher. PJM auction results explain what those costs mean for businesses.

• MISO: runs a capacity auction, and prices there have climbed quickly too. See how the Midwest capacity market tripled.

• NYISO and ISO-NE (New York and New England): both have capacity markets, with their own rules for auction timing and design.

• CAISO (California): no centralized capacity auction. The state requires utilities and suppliers to secure enough capacity themselves.

Does no capacity charge mean cheaper power in Texas?

Not automatically. The cost of reliability still exists in Texas. It just shows up in a different place. Instead of a predictable charge set years ahead, the risk sits in the energy price itself, and it concentrates in a small number of extreme hours.

For a business on index pricing, those hours can move a monthly bill a lot. For a business on a fixed rate, the supplier prices that risk into the contract. Either way, someone pays for scarcity.

Texas bills still carry other grid costs. Transmission charges in ERCOT are often based on a site's demand during the four highest-demand intervals of the summer, so when a building uses power matters as much as how much.

What should a Texas energy buyer do differently?

In a capacity market, the key question is how much the auction adds to next year's budget. In ERCOT, the key question is how exposed you are to price spikes, and when. That shifts the focus to contract structure, timing and managing risk. A policy-driven approach to energy risk management treats that exposure as something to plan for, not something to react to after a storm.

Businesses with sites both in Texas and in PJM or MISO should budget for these separately. One region carries a visible capacity line item. The other carries a hidden volatility premium.

Key Takeaway

There is no ERCOT capacity market. Texas pays for reliability through high prices during tight hours instead of a separate capacity charge. That removes one bill line but puts more risk into energy prices, so contract structure and timing matter more in Texas than in capacity-market regions.