Texas Electricity Market & Regulation Terms

Texas Electricity Glossary

Texas operates the most competitive retail electricity market in the United States, governed by ERCOT (the grid operator) and PUCT (the state regulator). The market structure — created by Senate Bill 7 in 1999 — separates generation, transmission, and retail into distinct competitive and regulated layers. Understanding key market terms helps you interpret plan pricing, news about grid events, and your rights as a consumer.

See also: ERCOT · PUCT · REP · Deregulated Electricity · Power to Choose

Senate Bill 7 (SB7)

The 1999 Texas legislation that deregulated the state's electricity market, effective January 2002. SB7 restructured the industry by separating generation, transmission, and retail functions — allowing consumers in ERCOT territories to choose their own retail electric provider. Most of Texas's population now lives in a deregulated area as a result.

ERCOT (Electric Reliability Council of Texas)

The independent system operator (ISO) that manages the electric grid for approximately 90% of Texas's load. ERCOT operates the wholesale electricity market, coordinates real-time balancing of supply and demand, manages transmission, and oversees reliability. ERCOT is largely isolated from the Eastern and Western U.S. interconnections, giving Texas regulatory independence.

PUCT (Public Utility Commission of Texas)

The state agency that regulates Texas electric utilities, retail electric providers, and the competitive electricity market. PUCT sets TDU delivery rates, enforces consumer protection rules, and oversees ERCOT. It has five commissioners appointed by the governor and confirmed by the Senate. PUCT rules directly affect deposit limits, disconnection procedures, and billing rights.

Day-Ahead Market (DAM)

The forward wholesale electricity market operated by ERCOT where generators and load-serving entities trade electricity for the following day at hourly prices. Day-ahead prices are settled financially, providing price certainty for participants hedging exposure to the real-time market. Most retail electricity sold to consumers is ultimately backed by day-ahead or bilateral contracts.

Real-Time Market (RTM)

ERCOT's spot wholesale electricity market, where electricity is priced and dispatched every 5 minutes based on actual grid conditions. Real-time prices can spike dramatically — to the ERCOT price cap of $5,000/MWh during scarcity events — reflecting the immediate cost of balancing supply and demand. Indexed electricity plans may directly expose retail customers to real-time market prices.

Wholesale Electricity Price

The price at which electricity is bought and sold between generators, load-serving entities, and traders in the ERCOT wholesale market. Wholesale prices fluctuate by the minute and are the upstream cost driver for retail electricity rates. REPs hedge wholesale price exposure through futures contracts, bilateral agreements, and generation ownership.

Price-to-Beat

A historical Texas concept (2002–2007) requiring incumbent REPs to offer a regulated maximum rate — the "price to beat" — so competitive providers could undercut it. The price-to-beat regime has expired; all residential rates in ERCOT are now fully market-determined. The term sometimes informally refers to the incumbent's current standard offer.

Ancillary Services

Grid reliability services that ERCOT procures from generators to maintain frequency and respond to sudden imbalances. Categories include regulation (fast frequency response), responsive reserve (spinning reserve), and non-spinning reserve. The cost of ancillary services is passed through to REPs and ultimately to retail customers as part of TDU charges or wholesale energy costs.

Scarcity Pricing

A mechanism in ERCOT's real-time market where prices automatically rise toward the price cap ($5,000/MWh) during periods of very tight supply — high demand relative to available generation. Scarcity pricing signals generators to ramp up output and large users to curtail consumption. It is one of the primary market signals for investment in new generation capacity in Texas.

ERCOT Price Cap (HCAP / LCAP)

ERCOT sets a High Systemwide Offer Cap (HCAP) at $5,000/MWh — the maximum price a generator can offer in the real-time market. A Low Systemwide Offer Cap (LCAP, typically $0/MWh) prevents generators from submitting negative offers that could distort the market. The HCAP is what drives extreme retail price spikes on indexed plans during scarcity events.

Retail Electric Provider (REP)

A company licensed by PUCT to sell electricity to end-use customers in the deregulated ERCOT market. REPs buy wholesale electricity, bundle it with TDU delivery charges, and sell retail plans to consumers. There are approximately 100+ active licensed REPs in Texas. REPs are responsible for billing, customer service, and plan terms — but the TDU handles physical delivery.

Provider of Last Resort (POLR)

A REP designated by PUCT to serve customers who have lost their electricity service provider — for example, when a REP goes bankrupt or exits the market. POLR service is typically priced above market rates and is intended as a temporary safety net. Customers should shop for a competitive plan as soon as possible after being placed on POLR service.

Competitive Renewable Energy Zone (CREZ)

A PUCT-approved transmission build-out (completed ~2013) that constructed approximately 3,600 miles of high-voltage transmission lines connecting wind-rich West Texas and the Panhandle to population centers in Dallas, Houston, and San Antonio. CREZ dramatically increased Texas's wind capacity and lowered wind power costs by eliminating transmission bottlenecks.

Nodal Market

ERCOT operates a nodal market (since 2010), meaning electricity prices vary at hundreds of individual network nodes depending on local transmission constraints. Congestion between nodes creates locational marginal price (LMP) differences. Retail customers are generally shielded from nodal pricing — they pay a load-zone-averaged price — but congestion costs affect wholesale market economics.

Power to Choose

The official Texas retail electricity shopping website (powertochoose.org) maintained by PUCT. All licensed REPs must post their plans on Power to Choose. The site displays advertised rates at 500, 1,000, and 2,000 kWh, but leaves the arithmetic at your own usage level to you. Tools like TexasPowerCost.com interpolate between those three filed price points to estimate the cost at your real usage, and state the regulated TDU delivery charge separately.

← Back to Texas Electricity Glossary