Texas runs its own power grid, and that single fact explains nearly everything about how Texans buy electricity, what happens when the lights go out, and why shopping for a plan in Houston works nothing like shopping for one in Denver.
This page is the hub for everything Choose My Power covers about the Texas electrical grid. The sections below explain what ERCOT is, how the grid is physically structured, why Texas is isolated from neighboring states, and what all of that means for a household trying to pick a retail electricity plan.
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What Is ERCOT?
ERCOT stands for Electric Reliability Council of Texas. It is the independent system operator that manages the flow of electricity for about 90 percent of Texas's electric load, covering roughly 75 percent of the state's landmass and serving more than 27 million customers (ERCOT, 2025).
ERCOT does not sell electricity to consumers. Its job is to keep supply and demand balanced on the transmission system at every moment of the day, dispatch power plants, and settle the wholesale market where generators get paid. Think of ERCOT as the air traffic control tower: it does not own the planes, but nothing moves without its coordination.
The Public Utility Commission of Texas (PUCT) oversees ERCOT. The PUCT sets the rules, approves market changes, and is the place consumers file formal complaints when a retail provider breaks state law.
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The Texas Power Grid Map: What It Covers and What It Does Not
The ERCOT grid covers most of Texas but not all of it. Several areas of the state fall under different grids and different rules.
- El Paso is served by El Paso Electric and connects to the Western Interconnection, the grid that covers the western United States and Canada.
- The Texas Panhandle (Amarillo) connects partly to the Southwest Power Pool (SPP), which serves much of the central U.S.
- Beaumont and parts of East Texas near the Louisiana border connect to the Midcontinent Independent System Operator (MISO) or the Southwest Power Pool.
If a household is in one of these non-ERCOT pockets, the retail electricity market works differently, and in some cases there is no choice of provider at all. Consumers in El Paso, for example, are served by a regulated monopoly utility with no retail competition.
ERCOT covers about 90 percent of the state's electric load, but not every customer inside it can shop. Municipal utilities such as Austin Energy and CPS Energy, along with most electric cooperatives, sit inside ERCOT without retail competition. ERCOT administers retail switching for roughly 8 million premises in competitive choice areas, and that is the market this site focuses on.
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Why Texas Has Its Own Isolated Grid
The United States has three major alternating-current interconnections: the Eastern Interconnection, the Western Interconnection, and ERCOT. Texas is one of its own.
The isolation is intentional and dates to decisions made in the early twentieth century. Texas utilities built their system to avoid crossing state lines with significant power flows, which would have brought the system under federal jurisdiction by the Federal Power Act. By staying within state borders, Texas retained the ability to regulate its own grid through state agencies rather than the Federal Energy Regulatory Commission (FERC).
That choice has real consequences today. Because ERCOT connects to neighboring grids only through a small number of direct-current (DC) tie lines with limited capacity, Texas cannot import large volumes of electricity quickly during an emergency. The February 2021 winter storm, which caused widespread outages across the state, illustrated this constraint sharply. ERCOT was operating as an island while neighboring grids had surplus power they could not deliver at meaningful scale.
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How the Wholesale Market Works Inside ERCOT
ERCOT operates a real-time wholesale market where the price of electricity changes every five minutes based on supply and demand across thousands of pricing nodes on the transmission network. It also runs a day-ahead market where generators and large buyers can lock in prices a day in advance.
Wholesale prices can swing from a few dollars per megawatt-hour during mild weather with strong wind generation to the market cap, which PUCT has set at $5,000 per megawatt-hour during scarcity conditions. That volatility in the wholesale market is one reason retail providers exist: they buy power in bulk, manage price risk, and offer households stable rates through fixed-price contracts.
When a consumer signs a 12-month fixed-rate plan at, say, 11 cents per kilowatt-hour, the retail provider is absorbing the risk that wholesale prices might spike above that level. If wholesale prices stay low, the provider earns a margin. If prices spike, the provider absorbs the loss, not the household.
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Deregulation: Where It Applies and What It Means for Shoppers
In 2002, Texas opened the retail electricity market to competition in ERCOT. Incumbent utilities were required to separate their generation and retail businesses. New retail electric providers (REPs) entered the market, and consumers gained the legal right to choose their electricity supplier.
The incumbent utilities, such as Oncor in the Dallas-Fort Worth area or CenterPoint in Houston, retained ownership of the poles and wires. Those wires businesses remain regulated monopolies. A household cannot choose who delivers electricity to its meter. It can only choose who bills for it and what supply contract terms apply.
This distinction matters when evaluating a plan. Delivery charges, which cover the cost of maintaining poles, transformers, and meters, are set by the utility and passed through on every bill regardless of which REP a customer chooses. A retail plan advertised at a low energy rate can carry high delivery charges that change the all-in cost considerably.
Posted rates vary widely. The U.S. Energy Information Administration put the average Texas residential price at 15.88 cents per kilowatt-hour in July 2026, and headline rates on comparison sites run both well below and well above that figure. The very cheapest advertised numbers are almost always bill-credit plans: APG&E's SimpleSaver line, for example, applies a $125 credit only when monthly usage reaches at least 1,000 kWh, so the advertised rate holds at exactly that usage level and climbs sharply below it. The spread between the cheapest and the typical plan is wider than most consumers expect. Part of that is the regulated delivery charge, which by itself works out to roughly 6 to 8.5 cents per kilowatt-hour at 1,000 kWh depending on the utility. Oncor's residential delivery has been 6.8673 cents per kWh plus $4.06 a month since October 4, 2026. The rest is competition: the PUCT's directory listed 141 certificated retail electric providers as of October 2026, though only a subset actively markets residential plans in any single service territory.
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Grid Reliability and What It Means for Your Home
Since the 2021 winter storm, Texas has made several changes to improve grid reliability. PUCT and the Texas Legislature required generators to weatherize equipment to specified cold-weather standards. ERCOT now conducts on-site weatherization inspections and refers non-compliance to the PUCT, which can assess administrative penalties of up to $1 million per violation per day. The operating reserve demand curve, which raises real-time prices as operating reserves run short, predates the storm (it took effect in June 2014) but its parameters have been adjusted several times since.
Whether those reforms are sufficient remains a subject of ongoing policy debate. ERCOT's seasonal capacity assessments, published before each summer and winter, give a sense of projected reserve margins. Consumers who want the latest figures can read ERCOT's public seasonal assessments directly at ercot.com.
For a household, grid reliability affects the value of backup options such as rooftop solar with battery storage or a whole-home generator. It also affects how to evaluate variable-rate plans, which expose a customer to wholesale price spikes during grid stress events.
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How to Use This Hub
The pages linked from this hub go deeper on each piece of the Texas electrical grid:
- ERCOT Texas Power Grid: A detailed look at how ERCOT dispatches generation and manages real-time balance.
- Texas Power Grid Map: A geographic breakdown of service territories, pricing zones, and the non-ERCOT areas.
- Electric Grid Map Texas: How transmission constraints create different wholesale price zones within ERCOT, and why a plan in Houston can differ from a plan in West Texas.
- Texas Electrical Grid and Weather: What seasonal demand peaks mean for supply adequacy and consumer prices.
Understanding the structure of the Texas power grid is not an academic exercise. The grid's design directly determines which plans are available to a household, how those plans are priced, and what risks a consumer takes on by choosing a variable-rate contract over a fixed one. Starting with the grid makes every other electricity decision easier to evaluate.