How ERCOT Manages the Texas Power Grid

What ERCOT Does Every Day

The Electric Reliability Council of Texas (ERCOT) is the nerve center of the Texas power grid. Every day, their operators in a control room near Austin monitor supply and demand across the grid, directing power plants to generate more or less electricity as conditions change.

ERCOT manages about 90% of Texas’s electric load, serving roughly 27 million customers. They do not own any power plants or power lines. Instead, they coordinate the system — making sure generators produce enough electricity to match what homes and businesses are pulling from the grid at every moment.

The Texas Interconnection

The United States has three major power grids: the Eastern Interconnection, the Western Interconnection, and the Texas Interconnection. Texas is unique in having its own standalone grid. This means the vast majority of electricity generated in Texas stays in Texas, and the state does not rely on power imports from neighboring states.

The Texas Interconnection covers most of the state but not all of it. El Paso is connected to the Western Interconnection, and small parts of the Panhandle and East Texas connect to the Eastern Interconnection. Those areas operate under different rules and regulators.

There are a few small connections between the Texas grid and the other two, called DC ties. These can transfer limited amounts of power in emergencies, but the capacity is modest — roughly 1,200 megawatts total, compared to peak summer demand that can exceed 85,000 megawatts.

Why Texas Has Its Own Grid

The separation goes back to the early 20th century, when Texas utilities chose to avoid selling electricity across state lines. Under the Federal Power Act, any utility that transmits power across state borders falls under the jurisdiction of the Federal Energy Regulatory Commission (FERC). By keeping the grid within Texas, the state maintains regulatory control through the Public Utility Commission of Texas (PUCT).

This independence gives Texas flexibility to design its own electricity markets and set its own rules. It also means the state cannot easily call on neighboring grids for help during emergencies, which became painfully clear during Winter Storm Uri in February 2021.

How the Wholesale Market Works

ERCOT operates two wholesale electricity markets:

The day-ahead market. Generators and buyers submit bids and offers for the next day’s electricity. ERCOT clears the market by matching supply and demand for each hour of the following day. This gives generators and REPs a chance to plan ahead.

The real-time market. This market runs every 5 minutes and handles the gap between day-ahead plans and actual conditions. If demand is higher than expected or a generator goes offline, the real-time market adjusts prices to attract more supply.

Wholesale prices can range from near zero (when wind and solar are producing heavily and demand is low) to the system-wide cap of $5,000 per megawatt-hour during extreme scarcity. These price signals drive investment in new generation and influence the retail rates that REPs offer to consumers.

ERCOT’s Reliability Tools

ERCOT uses several tools to keep the grid stable:

Operating reserves. ERCOT requires generators to keep a margin of extra capacity available at all times. These reserves can be called on within minutes if demand spikes or a generator trips offline.

Conservation appeals. When reserves get tight, ERCOT asks Texans to reduce their electricity use voluntarily. These appeals typically go out during extreme heat when air conditioning pushes demand to its limits.

Emergency procedures. If conservation is not enough, ERCOT can order rotating outages (controlled blackouts) to prevent a total grid collapse. This is a last resort and is designed to protect the grid’s physical infrastructure.

Weatherization requirements. After the 2021 winter storm, the Texas Legislature passed laws requiring generators and natural gas facilities to weatherize their equipment. ERCOT and the PUCT now inspect facilities for compliance.

ERCOT’s Governance After 2021

The 2021 winter storm exposed serious gaps in grid management and led to sweeping governance changes. The ERCOT board was restructured so that all members are now appointed by state leaders rather than elected by market participants. The PUCT gained expanded authority over ERCOT’s operations, and the Texas Legislature created new market mechanisms to incentivize reliable generation.

The Bottom Line

ERCOT is the entity that keeps the Texas power grid running minute by minute. They coordinate generators, operate wholesale markets, and manage reliability across a grid that serves 27 million people. Understanding how ERCOT works helps you make sense of why electricity prices change, what grid alerts mean, and how the Texas energy market operates.