What ERCOT Does
The Electric Reliability Council of Texas is the referee and marketplace for the state's power grid. It doesn't own a single power plant or a mile of wire, yet it keeps the lights on for roughly 90% of Texas — here's how.
The Grid Operator Behind Your Lights
Every time you flip a switch in most of Texas, an organization you'll never get a bill from made it possible. ERCOT, the Electric Reliability Council of Texas, manages the flow of electric power to more than 27 million customers — about 90% of the state's electric load, across roughly 75% of its land area.
ERCOT is deliberately unusual. It is a membership-based 501(c)(4) nonprofit, not a government agency and not a utility. It operates the Texas Interconnection, a grid kept largely inside state lines so it answers to Texas regulators rather than federal ones. Its job is to make sure electricity supply exactly matches demand every second of every day, to run the wholesale market where that power is bought and sold, and to keep the whole system reliable. It is overseen by the Public Utility Commission of Texas and the Texas Legislature.
Key Takeaways
What ERCOT is responsible for, at a glance.
Keeps most of Texas powered
ERCOT manages about 90% of the state's electric load — more than 27 million customers.
Balanced record demand
The all-time peak it has managed, set July 22, 2026 — roughly the output of 90 large power plants at once.
Coordinates the transmission grid
ERCOT oversees more than 55,000 miles of high-voltage lines and 1,460+ generation units.
The nation's first ISO
ERCOT became the first Independent System Operator in the U.S., running an open, neutral grid.
What ERCOT Actually Does
Behind the single phrase "grid operator" are five distinct jobs. Together they let millions of Texans buy power from competing companies while it all flows over one shared system.
Matches supply to demand in real time
Electricity can't be stored at grid scale, so ERCOT dispatches generators second by second to keep supply and demand in balance and the grid's frequency stable.
Runs the wholesale power market
ERCOT operates the day-ahead and real-time markets where generators and providers buy and sell electricity, setting the wholesale prices that ripple through to retail plans.
Settles the money
It performs the financial settlement for the competitive wholesale bulk-power market, clearing payments between hundreds of market participants.
Plans and directs the transmission grid
ERCOT studies where the grid needs new lines, provides open, nondiscriminatory access to transmission, and coordinates how new generation and large loads connect.
Administers your provider switch
When you change Retail Electric Providers, ERCOT processes the switch — it administers retail switching for roughly 8 million premises in Texas's competitive choice areas.
Guards long-term reliability
ERCOT forecasts demand, tracks whether enough generation is being built, and issues conservation appeals or emergency alerts when the grid is tight.
ERCOT and the U.S. Power Markets
Most of the country buys and sells wholesale electricity through independent grid operators — RTOs and ISOs — that run competitive markets. ERCOT is Texas's, standing alongside PJM, MISO, SPP, CAISO, NYISO, and ISO New England. The "Northwest," "Southwest," and "Southeast" areas have no organized market; there, traditional vertically integrated utilities still handle everything. Roughly two-thirds of U.S. electricity demand is served inside these market regions.
The ERCOT Footprint
ERCOT covers roughly 75% of Texas's land area and about 90% of its electricity use — the blue center of the state. The edges belong to other grids: El Paso and the far west sit in the Western Interconnection, while the Panhandle, the South Plains, a northeast corner near Texarkana, and the southeast around Beaumont fall in the Eastern Interconnection (served through SPP and MISO). Those non-ERCOT areas generally don't have retail choice.
What ERCOT Doesn't Do
Because ERCOT sits at the center of the grid, it gets blamed for things that actually belong to other players. Three quick clarifications:
It doesn't set your rate
The price and plan on your bill come from the Retail Electric Provider you choose, not from ERCOT. ERCOT runs the wholesale market; your provider sets retail prices.
It doesn't own wires or restore outages
Your Transmission & Distribution Utility — Oncor, CenterPoint, AEP Texas, or TNMP — owns the poles and lines and sends crews when the power goes out, regardless of your provider.
It doesn't send you a bill
ERCOT has no customer accounts. You never pay ERCOT directly; you pay your Retail Electric Provider, who bundles in the regulated delivery charges.
How ERCOT Got Here
ERCOT's role grew step by step, from a reliability council into the operator of the country's largest competitive electricity market.
ERCOT is formed
After the 1965 Northeast blackout, Texas utilities create the Electric Reliability Council of Texas to coordinate and safeguard the reliability of the state's self-contained grid.
ERCOT becomes the first ISO
ERCOT is designated the first Independent System Operator in the United States, charged with giving all competitors open, neutral access to the transmission grid.
ERCOT takes on the retail market
As Senate Bill 7 launches retail competition on January 1, 2002, ERCOT begins administering customer switching and financial settlement for the new competitive market.
The nodal market goes live
ERCOT switches to a nodal wholesale market design, pricing power at specific grid locations for more precise, efficient dispatch and congestion management.
Winter Storm Uri and reform
A historic freeze pushes the grid to the edge of collapse. The crisis drives new reliability rules and a governance overhaul that restructures ERCOT's board and leadership.
A record-setting grid
Surging demand from population growth, industry, and data centers pushes ERCOT to an all-time peak of 91,089 MW on July 22, 2026 — the busiest day in its history.
Frequently Asked Questions
What is ERCOT?
ERCOT is the Electric Reliability Council of Texas, the independent grid operator that manages the flow of electric power to more than 27 million Texas customers, about 90% of the state's electric load. It's a membership-based 501(c)(4) nonprofit, not a government agency and not a power company, and it is overseen by the Public Utility Commission of Texas and the Texas Legislature.
What does ERCOT actually do?
ERCOT keeps electricity supply and demand balanced in real time, runs the competitive wholesale power market, performs the financial settlement that pays generators and charges providers, directs transmission planning and grid access, and administers retail switching for roughly 8 million premises so customers can change providers.
Does ERCOT set my electricity rate?
No. ERCOT operates the wholesale market and the grid; it does not set the retail price you pay. Your rate is set by the Retail Electric Provider you choose. Wholesale conditions on the ERCOT grid can influence retail prices over time, but the plan and price on your bill come from your provider, not from ERCOT.
Does ERCOT deliver power to my home or fix outages?
No. The poles and wires are owned and maintained by your Transmission & Distribution Utility, such as Oncor, CenterPoint, AEP Texas, or Texas-New Mexico Power. That utility physically delivers electricity and restores outages, no matter which provider you buy your plan from.
Who oversees ERCOT?
ERCOT is overseen by the Public Utility Commission of Texas (PUCT) and the Texas Legislature. It's a membership-based 501(c)(4) nonprofit governed by a board of directors, whose members include consumers, generators, retail electric providers, cooperatives, municipal utilities, and transmission and distribution providers.
What part of Texas does ERCOT cover?
ERCOT manages about 90% of the state's electric load and roughly 75% of its land area. A few regions sit on other grids and are outside ERCOT, including El Paso, the Panhandle, and parts of deep East Texas.
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