Trystan Casey
Texas is the only state in the continental US with its own electrical grid. The Electric Reliability Council of Texas (ERCOT) manages the flow of electric power on the Texas Interconnection, which supplies power to 26 million customers, representing 90% of the state's electric load. ERCOT is a nonprofit independent system operator that works with the Texas Reliability Entity (TRE) to improve the reliability of the bulk power grid. ERCOT manages the price of power and balances supply and demand in the grid, while the Public Utility Commission (PUC), whose board is appointed by the governor, regulates electricity production in the state.
| Characteristics | Values |
|---|---|
| Name of the electric grid | Texas Interconnection |
| Type of electric grid | Alternating current (AC) power grid |
| Who controls the grid | Electric Reliability Council of Texas (ERCOT) |
| Who does ERCOT answer to | State Public Utility Commission (PUC) |
| Who appoints the PUC | Governor Greg Abbott |
| Who does the PUC answer to | Texas Legislature |
| Who does the Legislature answer to | No one |
| Who produces power | Electricity generators like NRG and Vistra |
| Who sells power | Retail electric providers like Tara Energy and Griddy |
| Who transports the power | Transmission companies like Oncor |
| Who manages the grid | Transmission and distribution utilities (TDU) like Oncor and CenterPoint |
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What You'll Learn
The Electric Reliability Council of Texas (ERCOT)
ERCOT oversees the reliable transmission of electricity across Texas, serving more than 26 million Texans, which represents 90% of the state's electric load. The Texas Interconnection provides more than 86,000 megawatts of energy and connects over 52,000 miles of high-voltage transmission lines. Power demand in the ERCOT region is typically highest during the summer due to air conditioning use in homes and businesses.
ERCOT is governed by an 11-member board of directors, which includes consumer representatives, independent members, members from electricity utility market groups, and the CEO of ERCOT, as well as representatives from the Texas Public Utility Council and the Office of Public Utility Counsel. As a membership-based nonprofit, ERCOT's members include consumers, electric cooperatives, generators, power marketers, retail electric providers, and various electric utilities.
In recent years, ERCOT has faced challenges due to extreme weather events, such as the February 2021 winter storm that caused widespread blackouts across Texas. In response, Texas passed a law in June 2021 to reform ERCOT and improve the state's power grid by mandating the weatherization of power infrastructure. Despite these efforts, the Texas power grid remains vulnerable to potential blackouts during extreme weather events.
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The Public Utility Commission (PUC)
The PUC's stated mission is to "protect customers, foster competition, and promote high-quality infrastructure." It regulates the rates and services of electric and telecommunication utilities, as well as transmission and distribution utilities that operate in competitive markets. The PUC also offers customer assistance in resolving consumer complaints.
In 2013, the Texas Legislature expanded the PUC's responsibilities to include water utility regulation. The PUC has played a significant role in overseeing the transition to competitive markets in the telecommunication and wholesale and retail electric industries.
The PUC has undergone various changes over the years, shifting its focus from upfront regulation of rates and services to oversight of competitive markets and compliance enforcement. It is governed by a five-member commission appointed by the Governor of Texas.
The PUC has faced lawsuits and criticism following the February 2021 North American winter storm, which caused a spike in electricity prices and prolonged blackouts across Texas. However, the Supreme Court of Texas ruled in 2024 that the PUC acted within its authority as a state agency and was immune from suit.
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Texas's unique power grid
Texas has a unique power grid system, independent of federal regulation. The Texas Interconnection is an alternating current (AC) power grid, a wide-area synchronous grid that covers most of the state. Texas established its independent grid in the 1930s to avoid federal regulation of interstate electricity transmission. The grid is managed by the Electric Reliability Council of Texas (ERCOT), a membership-based nonprofit corporation, which oversees electricity for over 25 million residents, approximately 90% of the state's population.
The separation of the Texas grid from the rest of the country can be traced back to the early 20th century, when small generating plants began to spring up across Texas, bringing electric light to cities. In 1935, President Franklin D. Roosevelt signed the Federal Power Act, which oversaw interstate electricity sales. By not crossing state lines, Texas utilities avoided being subjected to federal rules. Texas has substantial coal, natural gas, and oil resources to fuel its power plants.
ERCOT is the first independent system operator (ISO) in the United States and one of nine ISOs in North America. It works with the Texas Reliability Entity (TRE), one of eight regional entities within the North American Electric Reliability Corporation (NERC) to improve the reliability of the bulk power grid. ERCOT manages the flow of electric power on the Texas Interconnection, dispatching power on an electric grid that connects 46,500 miles of transmission lines and more than 550 generation units.
Texas's grid independence has been violated a few times, including during blackouts in 2011 when Mexico provided assistance. The state's energy market relies on a diverse mix of resources, including natural gas, wind energy, coal and nuclear power, solar energy, and increasing investments in renewables. However, the independence of the Texas grid also means that during emergencies, the state must depend solely on its own resources. This was highlighted during the 2021 winter storm when natural gas infrastructure and wind turbines froze, resulting in widespread outages.
Since 2021, efforts have been made to improve grid reliability and resilience through winterization of infrastructure, diversifying energy sources, advanced grid monitoring, and energy storage solutions. Despite these improvements, the Texas power grid is still vulnerable to extreme weather conditions.
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The 2021 winter blackout
Texas is the only state in the continental US with its own electrical grid. The Texas Interconnection is an alternating current (AC) power grid that covers most of the state. The grid is managed by the Electric Reliability Council of Texas (ERCOT), which produces power for 90% of the population.
In February 2021, a historical winter event occurred across the state of Texas, causing a blackout that left more than 4.5 million customers (over 10 million people) without electricity at its peak, some for several days. The storm caused a loss of coal, natural gas, wind, and nuclear power production, resulting in a shortfall of over 10 gigawatts of customer demand.
The Texas freeze had cascading effects on other services reliant on electricity, including drinking water treatment and medical services. Economic losses from lost output and damage are estimated to be $130 billion in Texas alone. The Electric Reliability Council of Texas (ERCOT) admitted that the power grid was four minutes and 37 seconds away from complete failure when partial grid shutdowns were implemented.
Following the 2021 Texas power crisis, there was major fallout among regulators and utilities as actors sought to apportion blame and utilities and generators began to settle accounts. Five members of ERCOT unaffiliated with Texas entities resigned due to the power failures. In March 2021, Congress launched an investigation into the power crisis by requesting documents relating to winter weather preparedness from the Texas electric grid manager and ERCOT.
In June 2021, Texas passed a law to reform ERCOT and to weatherize and improve the state's power grid. The law mandated the weatherization of power generators, natural gas, and transmission facilities so that they can withstand extreme weather conditions. Despite these weatherization efforts, the Texas power grid is still vulnerable.
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The Texas legislature
However, the Texas legislature has faced criticism for creating a fragmented system with limited accountability. The state's energy infrastructure has proven vulnerable to extreme weather events, such as the 2021 winter storm that caused prolonged blackouts. In response, the legislature passed a law in 2021 to weatherize and improve the grid. Despite these efforts, concerns about the grid's resilience remain, and Texas lawmakers continue to grapple with the challenges of ensuring a reliable and robust energy system.
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Frequently asked questions
The Electric Reliability Council of Texas (ERCOT) manages the flow of electric power on the Texas Interconnection that supplies power to 26 million Texas customers, representing 90% of the state's electric load.
ERCOT is a membership-based nonprofit corporation, governed by a board of directors and subject to oversight by the Public Utility Commission of Texas (PUC) and the Texas Legislature. ERCOT's members include consumers, electric cooperatives, generators, power marketers, retail electric providers, and utilities.
The Texas Interconnection is an alternating current (AC) power grid that covers most of the state of Texas. It is one of three minor grids in the North American power transmission grid. The grid is managed by ERCOT.
Texas passed a law to deregulate the retail electricity market, meaning that the market controls the price of power up to a price cap set by the PUC. Texas energy companies have chosen to operate without interstate connections to avoid federal regulation.
