Electric Reliability Council of Texas

Electric Reliability Council of Texas, Inc. (ERCOT)
Company type	Nonprofit organization (501(c)(4))
Industry	Electric power transmission system operator
Founded	1970
Headquarters	Austin, United States
Area served	Texas (approximately 90% of the state's electricity demand)
Products	Management of Texas electrical grid, wholesale electricity market settlements, retail customer switching facilitation
Website	www.ercot.com

The Electric Reliability Council of Texas, Inc. (ERCOT) oversees the Texas electrical grid, known as the Texas Interconnection, delivering electricity to more than 25 million consumers and managing approximately 90% of the state's electricity demand. ERCOT holds the distinction of being the first independent system operator (ISO) established in the United States.

As the designated ISO, ERCOT supervises an extensive network exceeding 46,500 miles of transmission infrastructure and coordinates over 610 power generation facilities. It is also responsible for conducting financial settlements within the competitive wholesale bulk-power market and facilitates retail customer switching for around 7 million locations in deregulated regions.

In 2020, Texas's electricity generation portfolio was dominated by natural gas at 51%, followed by wind energy at 24.8%, coal at 13.4%, nuclear power contributing 4.9%, solar energy at 3.8%, and hydroelectric or biomass sources making up 1.9%.

ERCOT operates as a membership-driven 501(c)(4) nonprofit organization, comprising members such as consumers, electric cooperatives, power producers, energy marketers, retail electric providers, investor-owned utilities, and municipally owned utilities.

Summer months mark the peak electricity demand within ERCOT's jurisdiction, primarily driven by air conditioning usage. The highest recorded demand reached 85,931 megawatts on August 20, 2024—considering that one megawatt can supply roughly 200 Texas households during peak periods. By 2022, ERCOT had integrated 2 gigawatts of battery storage into the grid with plans for an additional 6 gigawatts under development.

History

During World War II, multiple Texas electric utilities collaborated to form the Texas Interconnected System (TIS) to ensure dependable power supply for Gulf Coast industries supporting wartime production efforts. After the war, TIS participants continued enhancing the interconnected network by implementing formal operating protocols and setting up monitoring centers in both North and South Texas.

ERCOT was established in 1970 to comply with North American Electric Reliability Corporation (NERC) standards. Despite this, Texas’s grid remains confined within state boundaries and is exempt from regulation under the Federal Power Act. In 1976, Central Southwest Holdings briefly linked the Texas grid to Oklahoma’s system through what became known as the "Midnight Connection," a move that faced legal disputes but ultimately affirmed Texas’s regulatory autonomy.

The deregulation of Texas’s electricity market unfolded in two stages: wholesale generation deregulation in 1995 followed by full retail deregulation in 1999. The reforms introduced in 1999 addressed generation capacity shortages by permitting retail providers and generators to operate without regulation while maintaining oversight of transmission infrastructure through regulation. This transition shifted from a localized generation-consumption model to a statewide competitive marketplace where retailers contract with various suppliers. Deregulation also eliminated rate caps, resulting in a 64% rise in residential electricity prices between 1999 and 2007.

2011 winter storm power losses

In February 2011, a severe winter storm caused freezing conditions that impacted natural gas pipelines, wells, and power plants, leading to outages affecting approximately 3.2 million Texans. Despite recommendations from both the Federal Energy Regulatory Commission and the North American Electric Reliability Corporation (NERC), ERCOT and the Public Utility Commission of Texas did not enforce mandatory winterization requirements. This oversight left Texas susceptible to subsequent winter storm blackouts, including the significant crisis experienced in February 2021.

Winter Storm Power Outages of 2021

In mid-February 2021, ERCOT declared a statewide emergency after encountering a generation deficit of 34,000 MW, which led to extensive power outages across Texas. Early on February 15 at 1:25 a.m., ERCOT began requesting blackout implementations from electricity providers. During this period, electricity prices surged dramatically, reaching over $9,000 per megawatt-hour (MWh) on February 16, compared to under $30 per MWh just the previous week. Several retail electricity companies faced the risk of insolvency, while customers of providers like Griddy reported exceptionally high bills. The multi-day storm caused power interruptions for roughly 4 million Texans, with some outages lasting from a few minutes up to more than 48 hours. Temperatures plunged to near −2 °F in some areas.

Governor Greg Abbott prioritized ERCOT reform as an emergency legislative matter on February 16 and launched an official inquiry. A comprehensive 357-page report from the 2011 blackout had already recommended winterization protocols; however, many essential power generators—particularly natural gas plants—were inadequately prepared for the 2021 cold snap.

Regions outside of ERCOT’s jurisdiction generally experienced fewer disruptions. For instance, utilities such as El Paso Electric and Entergy had implemented cold-weather enhancements after the 2011 events, resulting in minimal service interruptions during the storm.

The initial lawsuits accusing ERCOT of mismanagement were filed on February 19. By March 8, ERCOT started publishing weekly updates detailing billions of dollars in unpaid balances owed by market participants.

At least ten fatalities were initially attributed to the power failures, with the death toll surpassing 110 by late March. Further investigations suggested that nearly 200 deaths were directly related to the outages, while some assessments indicated that indirect fatalities could range between 426 and 978. Among those affected was an 11-year-old boy whose family pursued legal action against Entergy Texas and ERCOT for alleged gross negligence.

On March 4, 2021, ERCOT CEO Bill Magness, who had led the organization since 2016, was dismissed. The board granted him a 60-day notice period during which he remained in his position.

Changes in Electricity Generation Mix in 2023

In 2023, Texas's energy landscape saw a substantial expansion in solar capacity on the ERCOT grid, increasing by approximately 35%, including new storage facilities. This growth contributed to a reduction in natural gas consumption during midday hours. Solar output reached peaks of 5.3 GWh during summer months and 3.8 GWh in winter seasons, while wind power continued to dominate renewable generation with a total of 108,000 GWh. ERCOT has outlined plans to incorporate an additional 24 GW of solar capacity and 13 GW of battery storage by 2025. These increases significantly outpace projected expansions of around 3 GW each for wind and natural gas facilities. In parallel, energy demand hit an all-time high of 85 gigawatts during the hottest year on record in 2023 and is forecasted to climb to approximately 150 gigawatts by 2030 due to growth in data centers, cryptocurrency mining operations, and electrification within oil and gas sectors.

Measures to Improve Reliability

Following the widespread outages in 2021, Texas implemented mandatory weatherization standards for power plants alongside enhanced emergency communication protocols and initiatives supporting backup fuel reserves. The rise in solar power generation combined with large-scale battery storage—largely driven by private sector investments—has contributed positively toward grid reliability improvements. Nevertheless, Texas has yet to adopt stricter energy efficiency requirements, expand cross-state grid interconnections, or enforce regulations on natural gas supplies dedicated to electricity generation facilities.

Governance

ERCOT operates under the direction of a board of directors and is subject to oversight by the Public Utility Commission of Texas (PUC) as well as the Texas Legislature. The PUC exercises primary regulatory authority, with its three commissioners appointed by the governor. The ERCOT board is composed of independent members, consumer representatives, and individuals representing various market sectors. Guidance to the board is provided by the Technical Advisory Committee, which is supported by several subcommittees and workgroups.

The executive leadership team at ERCOT handles day-to-day management, reporting to the board. In the aftermath of the February 2021 winter storm, it became public knowledge that approximately one-third of ERCOT’s board members lived outside Texas, triggering public criticism and resulting in their subsequent resignations that same month. Later, in October 2021, El Paso billionaire Paul Foster was named chairperson despite El Paso being outside ERCOT's service area; he stepped down from this role in June 2024.

Organizational affairs

ERCOT’s main office is located in Austin, with an additional operational facility based in Taylor.

External links