A Brief History: From Monopoly to Open Market

To understand how commercial electricity purchasing works today, it helps to know how the system got here.

Before 2002, Texas electricity worked the way it still does in most regulated states. A single vertically integrated utility company controlled everything in a given area: the power plants that generated electricity, the transmission lines that carried it, and the billing relationship with the customer. Companies like Texas Utilities (now TXU Energy), Houston Lighting and Power (now CenterPoint Energy), and Central Power and Light had no competition. Rates were set through a regulatory process, and businesses had no choice but to accept whatever their local utility charged.

Senate Bill 7, passed in 1999 and implemented in phases starting January 1, 2002, changed that structure entirely. SB7 unbundled the electricity supply chain. Generation and retail sales were opened to competition, while transmission and distribution remained regulated monopolies. Existing utilities were required to divest their generation assets or functionally separate their retail operations.

The goal was straightforward: introduce market competition to drive down prices, improve customer service, and encourage innovation. Large industrial customers had already had some competitive options before 2002. Residential and small commercial customers gained full choice rights with the formal market launch.

The transition had growing pains. A “price to beat” mechanism was put in place for the first several years to protect consumers who did not actively choose a new provider while the market matured. Over time, the number of competing providers grew, comparison tools improved, and the market developed into what it is today: the largest deregulated retail electricity market in North America by customer count, with over 1,500 deregulated cities and more than 100 active retail electricity providers.

Who Does What: The Four Players in the Texas Market

The Texas electricity market separates what used to be one company’s job into four distinct roles. Each player has a specific function, and knowing who does what is the foundation of navigating this market as a business.

GENERATORS
Power generation companies produce electricity and sell it into the ERCOT wholesale market. Texas has a diverse generation mix: natural gas plants, wind farms, solar installations, nuclear facilities, and a small remaining share of coal. According to the PUCT, there are approximately 800 power generation companies in Texas. Some of the largest individual plants include the 2,500 MW South Texas Project (nuclear), the 2,736 MW W.A. Parish plant (coal), and major wind installations like Los Vientos in West Texas.

All of this electricity, regardless of its source, flows into the same grid and becomes fungible. A business that signs up for a “100% renewable” plan is not receiving a dedicated stream of wind power to its meter. It is receiving the same electricity as everyone else, with the renewable attribute accounted for separately through renewable energy certificates (RECs). The electrons themselves do not differentiate.

Businesses do not buy electricity directly from generators. That function belongs to the next layer of the market.

ERCOT
ERCOT is the independent system operator (ISO) that manages the flow of electricity across the grid and operates the wholesale electricity market. It serves more than 27 million Texans, manages over 1,250 power plants, and oversees more than 54,100 miles of transmission lines.

ERCOT runs two primary wholesale markets: a day-ahead market where generators submit offers for each hour of the next day, and a real-time market that clears every five minutes based on actual supply and demand conditions. These markets set the wholesale price of electricity, which directly influences what retail providers charge their commercial customers, especially those on indexed or variable rate plans.

ERCOT does not sell electricity to end users. It is not a utility and not a REP. Its role is infrastructure and market coordination. It ensures that generators, transmission companies, and retail providers all operate within the same system reliably.

The ERCOT territory covers most of Texas but excludes parts of East Texas (served through MISO), the Panhandle (served through the Southwest Power Pool), and El Paso (served by the Western Interconnection). Only businesses located within ERCOT territory can participate in the deregulated retail market.

TRANSMISSION AND DISTRIBUTION UTILITIES (TDUs)
TDUs, also called Transmission and Distribution Service Providers (TDSPs) or “wires companies,” own and maintain the physical infrastructure that delivers electricity from the grid to your building. This includes high-voltage transmission towers, substations, distribution lines, neighborhood transformers, and the meter installed at your property.

There are six TDUs serving the deregulated areas of Texas:

Oncor covers North and Central Texas, including Dallas and Fort Worth
CenterPoint Energy covers the Houston area
AEP Texas Central and AEP Texas North cover South and West Texas
TNMP (Texas-New Mexico Power) covers scattered territories across the state
LP&L (Lubbock Power & Light) covers the Lubbock area

TDUs are regulated monopolies. Your TDU is determined entirely by your physical location, and you cannot choose or switch it. Your delivery charges are set by the PUCT and are identical for every business at the same address, regardless of which retail electricity provider they use.

This is an important point for businesses evaluating providers: when a REP quotes you a rate, that rate does not include TDU delivery charges. Those charges appear separately on your bill and are the same no matter which REP you choose. Switching providers does not change your TDU, does not interrupt your service, and involves no physical changes to the wires or equipment serving your building.

RETAIL ELECTRICITY PROVIDERS (REPs)
REPs are the competitive companies that purchase wholesale electricity from the ERCOT market, package it into commercial plans, and sell it to businesses under contract. They handle billing, customer service, and contract management. As of 2026, more than 100 licensed REPs are serving the Texas deregulated market.

REPs are the only part of the supply chain where businesses have a choice. Choosing a REP means choosing a contract structure, a rate, and a set of terms. It does not mean choosing who generates your electricity or who maintains the wires to your building. Those remain fixed regardless of your provider.

When a business lets its contract expire without renewing, most REPs automatically place the account on a month-to-month variable rate plan. These default rates are almost always higher than contracted rates and can fluctuate significantly with market conditions. Active contract management is one of the most straightforward ways to control electricity costs.

BROKERS
Brokers are a fifth player worth noting, especially for commercial accounts. A commercial energy broker shops the market on a business’s behalf, compares offers from multiple REPs, and manages the contracting process. Brokers are compensated through a commission built into the per-kWh rate, which means their services typically come at no direct cost to the business.

For companies with significant monthly electricity spend or multiple locations, a broker can provide access to custom pricing not available on standard retail platforms, along with contract management and renewal monitoring.

Where Deregulation Does Not Apply

Not all of Texas is deregulated. Approximately 85% of the state’s electric consumers live in areas where they can choose their REP. The remaining 15% are served by municipal utilities or electric cooperatives that opted out of deregulation.

The major regulated areas include Austin (Austin Energy), San Antonio (CPS Energy), and El Paso (El Paso Electric). Parts of East Texas, the Panhandle, and rural areas served by cooperatives are also outside the ERCOT competitive market.

Businesses located in these areas receive electricity from their local regulated utility under rates set through a regulatory process. They cannot shop for a REP or sign a competitive contract.

How the Wholesale Market Affects Your Business

Even if your business is on a fixed-rate contract, understanding the wholesale market gives you context for why pricing behaves the way it does across contract cycles.

ERCOT’s day-ahead market sets prices for each hour of the following day based on generator bids and forecasted demand. The real-time market clears every five minutes and can deviate significantly from day-ahead prices when conditions change unexpectedly, due to a generator outage, a sudden weather shift, or a surge in demand.

During normal conditions, wholesale prices in Texas are generally below the national average. During extreme events, they can spike dramatically. The February 2021 winter storm caused wholesale prices to reach the market cap of $9,000 per MWh for several days. Businesses on variable or indexed contracts bore the full impact of those prices. Businesses on fixed-rate contracts were protected.

This dynamic is central to understanding commercial contract decisions. Fixed-rate plans provide budget certainty but lock you into a price that may be above market during low-demand periods. Variable and indexed plans offer exposure to lower prices when the market is favorable but carry real risk during demand peaks. The right structure depends on your usage profile and your organization’s tolerance for cost variability.

Deregulation and What It Actually Means for Your Business

Deregulation does not mean the electricity market is unregulated. It means the competitive functions, generation and retail sales, have been separated from the monopoly functions, transmission and distribution, and opened to market competition. The PUCT maintains robust oversight of REPs, enforces consumer protections, and regulates delivery charges. ERCOT manages market rules and grid reliability under PUCT and Texas Legislature authority.

For businesses, what deregulation means in practice is this: you are not captive to a single provider. You have the ability to shop, compare, and negotiate a contract that fits your operation. But the market does not work in your favor by default. Passive management, staying on expired contracts, not comparing rates at renewal, not understanding contract terms, consistently costs businesses more than it should.

The businesses that benefit most from deregulation are the ones that treat energy procurement as a managed business decision rather than an administrative afterthought.

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