Electric Reliability Council of Texas
Professional services
UnclaimedThe nonprofit organization that operates most of Texas's electric grid and administers the state's competitive wholesale electricity market.
Last updated August 22, 2026
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Overview
The Electric Reliability Council of Texas, commonly known as ERCOT, is a membership-based Texas nonprofit corporation that operates the Texas Interconnection and coordinates the wholesale electricity market serving most of the state. It manages power flows across more than 46,500 miles of transmission lines and coordinates the dispatch of hundreds of generating units. The system supplies electricity to more than 25 million Texans and represents approximately 90 percent of the state's electric load, although ERCOT does not cover every part of Texas; areas around El Paso and Beaumont, among others, are connected to different regional systems. ERCOT is an independent system operator and is widely described as the first ISO established in the United States. Its core responsibilities include balancing supply and demand in real time, scheduling and dispatching generation, managing transmission congestion, settling financial transactions in the competitive wholesale market, and administering retail-electricity switching for premises in areas with customer choice. Its members include electricity consumers, generation companies, power marketers, retail electric providers, investor-owned transmission and distribution utilities, electric cooperatives, and municipal utilities. The organization grew out of cooperation among Texas utilities during the Second World War. Those utilities formed the Texas Interconnected System to share electricity and support Gulf Coast industrial production. The interconnected operating arrangements continued after the war, eventually developing formal operating guides and monitoring centers. ERCOT was established in 1970 in connection with national reliability requirements. Texas's largely intrastate grid remained outside the normal interstate framework of the Federal Power Act, a structural feature that helped preserve the state's distinctive electricity-market design. Texas deregulated wholesale generation in 1995 and expanded electricity-market deregulation in 1999. The reforms separated generation, transmission, retail supply, and consumption more sharply and allowed retail providers to contract across the state. ERCOT became the central coordinator for the resulting market, while transmission and distribution utilities remained subject to regulation. The model increased competition and enabled substantial investment in gas, wind, solar, and storage, but also exposed ERCOT to difficult questions about market incentives, fuel supply, reserve margins, and extreme-weather preparedness. Reliability controversies have shaped ERCOT's public profile. A severe cold-weather event in February 2011 caused outages affecting millions of customers and revealed inadequate preparation of generating equipment and natural-gas infrastructure. A much more destructive winter storm in February 2021 produced a generation shortfall of approximately 34,000 megawatts, forced emergency load shedding, and left about four million customers without power for varying periods. Wholesale prices reached the statutory market ceiling of more than $9,000 per megawatt-hour during the crisis. The event generated investigations, lawsuits, executive and board departures, and intense criticism of ERCOT and state energy policy. After 2021, Texas adopted mandatory weatherization requirements for certain electric facilities, improved emergency communications, and provided measures related to backup fuel. Solar generation and grid-scale batteries also expanded rapidly, while rising demand from data centers, cryptocurrency mining, industrial activity, and electrification increased pressure on long-term planning. ERCOT remains overseen by the Public Utility Commission of Texas and the Texas Legislature, with a board representing independent directors, consumers, and market segments. Its role is operational rather than that of a conventional utility: ERCOT generally does not own the transmission network or sell electricity directly to end users.
History
ERCOT's origins lie in utility cooperation during the Second World War. Texas utilities formed the Texas Interconnected System so that electricity could be shared more effectively and excess generation could support Gulf Coast factories producing materials for the war effort. The participants maintained the interconnection after the war because coordinated operation improved reliability. They developed common operating procedures and established monitoring functions within utility control centers in North and South Texas. ERCOT was formed in 1970 in response to reliability requirements associated with the creation of the North American Electric Reliability Corporation's predecessor organizations. Texas's grid was designed largely as an intrastate system, limiting its exposure to federal interstate-power regulation. In 1976, Central Southwest Holdings briefly connected the Texas system to Oklahoma in an episode later called the “Midnight Connection.” Litigation followed over whether the connection subjected the system to federal jurisdiction, but the courts did not treat the short-lived connection as sufficient to change the grid's status. Texas electricity restructuring occurred in stages. Wholesale generation was opened to competition in 1995, followed by broader retail-market deregulation in 1999. The reforms separated competitive generation and retail supply from regulated transmission and distribution. Retail providers could arrange supply from generators across the state, making ERCOT's scheduling, balancing, and settlement functions increasingly important. The new market stimulated investment and consumer choice, but it also created debates about price volatility, reserve adequacy, transmission constraints, and whether market incentives sufficiently rewarded dependable capacity. The February 2011 winter storm exposed weaknesses in cold-weather preparation. Freezing conditions affected natural-gas wells and pipelines as well as generating facilities, producing outages for approximately 3.2 million customers. Federal reliability officials subsequently recommended stronger winterization, but the state did not adopt a comprehensive mandatory standard before the next major crisis. The February 2021 winter storm therefore became a defining event in ERCOT's history. Extreme cold disabled or constrained many generating resources and disrupted fuel supplies. ERCOT declared an emergency and ordered controlled outages to prevent a complete system collapse. Around four million customers lost power at some point, with some outages lasting much longer than the intended short rotating interruptions. Wholesale prices rose to more than $9,000 per megawatt-hour, creating enormous financial exposure for market participants and hardship for some retail customers. The 2021 event produced investigations, lawsuits, legislative action, and changes in ERCOT leadership. Multiple directors resigned, including out-of-state members whose residency became a prominent political issue. Chief executive Bill Magness was removed after the board's review. Texas subsequently required weatherization of certain generation and transmission facilities, strengthened emergency communications, and adopted measures concerning fuel and reliability. In December 2023, the Texas Supreme Court held that ERCOT was protected from the relevant blackout claims by sovereign immunity. The grid has continued to evolve. Wind power became a major source of annual generation, while solar and battery storage expanded rapidly. Solar additions reduced some midday reliance on natural gas, although the system still depends heavily on gas generation and faces challenging evening ramps and extreme-weather risks. Electricity demand has also risen because of industrial growth, data centers, cryptocurrency mining, oil and gas activity, and other large loads. ERCOT continues to operate most of Texas's grid while coordinating with the Texas Reliability Entity and remaining subject to the Public Utility Commission and state legislative oversight.
- 2023
Texas Supreme Court sovereign-immunity ruling
[1]The court held that ERCOT could not be sued over the 2021 blackouts under the asserted legal theory.
- 2021
February winter storm crisis
[1]A generation shortfall during extreme cold caused emergency load shedding, prolonged outages, market disruption, and major governance consequences.
- 2011
Severe winter storm exposes reliability weaknesses
[1]Freezing weather disrupted fuel supplies and generation, causing widespread customer outages and later winterization recommendations.
- 1999
Broader electricity deregulation begins
[1]Texas expanded restructuring to retail supply and related market functions, increasing ERCOT's role as market coordinator.
- 1995
Wholesale generation market opens
[1]Texas began the first phase of electricity-market deregulation by opening wholesale generation to competition.
- 1976
Midnight Connection
[1]A brief connection from the Texas grid to Oklahoma prompted litigation over the possible application of federal power regulation.
- 1970
ERCOT is established
[1]ERCOT was organized in connection with national electric-reliability requirements and became the coordinating body for the Texas Interconnection.
- 1940
Texas Interconnected System develops
[1]Texas utilities formed an interconnected operating system during the Second World War to improve reliability and support industrial production.
Products and positioning
An independent, nonprofit system operator and market administrator for most of Texas's electricity system, operating under the oversight of the Public Utility Commission of Texas and the Texas Legislature.
Grid operations · 1970
Texas Interconnection operations
ERCOT balances electricity supply and demand across most of Texas, dispatches generation, manages transmission constraints, and coordinates system conditions in real time. It operates a network spanning tens of thousands of miles of transmission infrastructure and hundreds of generating units, while coordinating reliability with the Texas Reliability Entity and other industry participants.
Energy market services · 1995
Wholesale electricity-market administration
ERCOT administers the competitive wholesale electricity market, including scheduling, pricing, congestion management, and financial settlement among generators, marketers, retailers, and other qualified participants. Its market systems are central to Texas's post-1990s electricity restructuring.
Customer-market administration · 1999
Retail switching administration
In competitive-choice areas, ERCOT maintains and administers processes that allow retail electricity customers to switch providers. The function supports the separation of retail supply from regulated transmission and distribution service.
Controversies
2021
February winter-storm grid failure
A large generation shortfall led to emergency load shedding and prolonged outages affecting millions of customers. Investigations and reporting linked the crisis to failures involving generation readiness, natural-gas supply, market design, and oversight. The event caused deaths, property damage, financial disruption, leadership departures, and extensive litigation.
2021
ERCOT overcharge finding after winter storm
Potomac Economics, described as the independent monitor of the Texas electricity market, said ERCOT did not lower electricity prices after the widespread outage ended on February 17, 2021, and continued charging at the higher rate for 32 hours. It said the operator consequently overcharged consumers by $16 billion.
2021
Texas governor orders investigation into ERCOT
Texas Governor Greg Abbott ordered an investigation into ERCOT following the winter storm and power outages.
2021
Texas family sues Entergy and ERCOT over boy’s death during blackouts
A Houston-area couple sued Entergy, alleging gross negligence after their 11-year-old son died of hypothermia during the Texas blackouts. The suit also alleges that ERCOT was responsible and seeks more than $100 million in damages from ERCOT and Entergy; these are allegations, not a reported court determination.
2011
Failure to adequately prepare for winter weather
The 2011 cold-weather outages prompted federal recommendations for winterization, but mandatory comprehensive preparation was not adopted before the 2021 storm. The episode became a major criticism of ERCOT and state reliability oversight.
Brand decisions
2021
Order emergency controlled outagesOtherBackground
During the February freeze, available generation fell far short of demand and ERCOT warned that uncontrolled system collapse was possible.
Action taken
ERCOT instructed service providers to shed load beginning early on February 15, producing rotating and prolonged outages.
Aftermath
The decision limited the risk of total grid collapse but caused widespread hardship, political backlash, investigations, leadership changes, and legal claims.
Wholesale electricity price. More than $9,000 per megawatt-hour (February 16, 2021)
2021
Replace senior leadership and board membersOtherBackground
Public and political criticism followed the winter-storm outages, including scrutiny of board members who lived outside Texas.
Action taken
Multiple directors resigned, and the board gave CEO Bill Magness notice of termination before removing him from leadership.
Aftermath
ERCOT's governance structure and reliability oversight became subjects of legislative and regulatory reform.
1999
Support broader retail-market deregulationStrategyBackground
Texas restructured the electricity sector to permit retail competition and statewide contracting between providers and generators.
Action taken
ERCOT administered market processes including retail switching while transmission and distribution remained regulated.
Aftermath
The market created more retail choice and a more complex statewide power system, alongside debate over prices and reliability incentives.
1995
Administer a competitive wholesale marketStrategyBackground
Texas opened wholesale generation to competition as part of electricity restructuring.
Action taken
ERCOT assumed a central coordination and settlement role for the competitive wholesale market.
Aftermath
The change increased the importance of ERCOT's dispatch, pricing, congestion, and settlement systems.
Recent events
Reported
Griddy Energy files for bankruptcy protection[6]
Griddy Energy filed for bankruptcy protection on Monday, about a month after customers received high electricity bills during the winter storm. Its filing said it owed ERCOT just over $29 million.
Weekdays and relative dates follow the original report; their exact calendar dates have not been verified.
- Unconfirmed
Reported
ERCOT overcharge finding after winter storm[3]
Potomac Economics, described as the independent monitor of the Texas electricity market, said ERCOT did not lower electricity prices after the widespread outage ended on February 17, 2021, and continued charging at the higher rate for 32 hours. It said the operator consequently overcharged consumers by $16 billion.
- Unconfirmed
Reported
Texas governor orders investigation into ERCOT[4]
Texas Governor Greg Abbott ordered an investigation into ERCOT following the winter storm and power outages.
Texas family sues Entergy and ERCOT over boy’s death during blackouts[5]
A Houston-area couple sued Entergy, alleging gross negligence after their 11-year-old son died of hypothermia during the Texas blackouts. The suit also alleges that ERCOT was responsible and seeks more than $100 million in damages from ERCOT and Entergy; these are allegations, not a reported court determination.
Sources6 sources
- 1Electric Reliability Council of Texasen.wikipedia.org
- 2ERCOT official websiteercot.com
- 3ERCOT overcharge finding after winter stormfinance.sina.com.cn
- 4Texas governor orders investigation into ERCOTibtimes.com
- 5Texas family sues Entergy and ERCOT over boy’s death during blackoutsnaturalnews.com
- 6Griddy Energy申请破产保护nbcdfw.com
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