Umair Gaines
The Electric Reliability Council of Texas (ERCOT) is an independent, nonprofit organization that operates Texas's electrical grid, supplying power to more than 25 million customers in the state, which is about 90% of the state's electrical load. Texas has its own electrical grid, separate from the country's two other electrical grids in the east and west. The Texas grid is not subject to federal regulation as it does not cross state lines. However, Texas does have some ties to the eastern grid and the Mexican grid, allowing for small transfers of power. During World War II, the Texas grid was temporarily interconnected with other states, and excess power was sent to industries on the Gulf Coast.
| Characteristics | Values |
|---|---|
| ERCOT's role | Managing the flow of electric power on the Texas Interconnection |
| ERCOT's members | Consumers, cooperatives, independent generators, independent power marketers, retail electric providers, investor-owned electric utilities, and municipally owned electric utilities |
| Number of customers | 25-27 million |
| Percentage of state's electric load | 90% |
| Miles of transmission lines | 46,500-54,100 |
| Generation units | 550-1,250 |
| Grid batteries | 2 GW (as of 2022) |
| Grid | Independent from the country's two other electrical grids that cover the eastern and western United States |
| Ties to other grids | Eastern Power Grid, Mexican Grid, Quebec Interconnection, Alaska Interconnection, Western Interconnection |
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What You'll Learn
The Electric Reliability Council of Texas (ERCOT)
ERCOT is the first independent system operator (ISO) in the United States and one of nine ISOs in North America. As the ISO for the region, ERCOT schedules and dispatches power on an electric grid that connects more than 54,000 miles of transmission lines and more than 550 generation units, including Private Use Networks. The Texas Interconnection is one of three minor grids in the North American power transmission grid, the other two being the Quebec Interconnection and the Alaska Interconnection. The grid is maintained as a separate grid for political, rather than technical reasons, and it does not cross state lines.
ERCOT works with the Texas Reliability Entity (TRE), one of eight regional entities within the North American Electric Reliability Corporation (NERC) that coordinate to improve the reliability of the bulk power grid. ERCOT also performs financial settlements for the competitive wholesale bulk-power market and administers retail switching for 7-8 million premises in competitive choice areas.
ERCOT was formed in 1970 to comply with NERC requirements. The Texas grid is not subject to regulation under the Federal Power Act, being an intrastate grid for the purposes of that law. The predecessor for ERCOT was formed in the 1930s after President Franklin D. Roosevelt signed the Federal Power Act, which gave the federal government authority to regulate power companies that engaged in interstate commerce. In response, Texas power companies agreed not to sell power outside of Texas, allowing them to avoid federal regulation.
The Texas Interconnection has ties to the Eastern Interconnection and the power grid in Mexico, but these ties only allow for transfers of small amounts of power.
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ERCOT's role as a balancing authority and interconnection
The Electric Reliability Council of Texas (ERCOT) is a unique entity in the United States' electric system. It serves as both the balancing authority and the interconnection for the state of Texas, ensuring the reliable operation of the power system within the state.
As a balancing authority, ERCOT manages the electric grid in Texas, balancing electricity demand with supply. This is essential to prevent local or wide-area blackouts, which can occur if demand and supply fall out of balance. ERCOT's role is to ensure that there is a sufficient supply of electricity to meet demand, which includes managing transfers of electricity with other balancing authorities.
ERCOT is also an interconnection, known as the Texas Interconnection. This means it is the physical system that connects generation units and transmission lines to supply power to customers. ERCOT's interconnection covers more than 46,500 miles of transmission lines and more than 600 generation units, serving over 25 million customers in Texas, which represents about 90% of the state's electric load.
ERCOT's role as both the balancing authority and the interconnection is unique in the United States. While there are other balancing authorities and interconnections throughout the country, ERCOT is the only one that is the same entity and physical system. This means that ERCOT has the dual responsibility of managing the electric grid and ensuring that there is enough supply to meet demand.
ERCOT's independence from federal oversight is due to its focus on managing Texas's intrastate grid. By avoiding the transfer of power across state lines, ERCOT has retained autonomy from federal regulation, which typically applies to interstate commerce and utilities operating across multiple states. This independence is a key aspect of ERCOT's role and has been carefully guarded by policymakers and the industry.
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Texas' independent power grid
Texas is the only state with its own power grid, which is managed by the Electric Reliability Council of Texas (ERCOT). ERCOT is a nonprofit organisation that operates Texas' electrical grid, the Texas Interconnection, which covers nearly the entire state and supplies power to more than 25 million customers, representing about 90% of the state's electric load.
The Texas grid is independent for political reasons, mainly due to a historical distrust of federal interference. In the 1930s, after President Franklin D. Roosevelt signed the Federal Power Act, Texas utilities made an agreement not to extend power beyond the state, thereby avoiding regulation by the newly created Federal Power Commission, whose jurisdiction was limited to utilities operating in interstate commerce. This decision created an "electrical island in the United States", as described by Bill Magness, the CEO of ERCOT.
The Texas grid is not subject to regulation under the Federal Power Act, as it is an intrastate grid. However, Texas has interconnected with other states in the past. During World War II, the Texas grid was connected to other states, providing excess power generation to industries on the Gulf Coast. In 1976, there was an attempt to connect the Texas grid to Oklahoma, which led to lawsuits over whether federal regulation then applied. Additionally, Texas has DC ties to the Eastern Interconnection and NERC systems in Mexico, allowing for some power exchange.
The independence of the Texas grid has advantages and disadvantages. On the one hand, it allows Texas to retain control over its energy policies and avoid federal regulation. On the other hand, it can lead to challenges during extreme weather events, such as the February 2021 winter storm that caused blackouts across the state. During this event, Texas was unable to access electricity produced in states that were not affected by the storm, highlighting the limitations of its independent grid.
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The Texas Interconnection
ERCOT is a membership-based 501(c)(4) nonprofit corporation, governed by a board of directors and subject to oversight by the Public Utility Commission of Texas (PUC) and the Texas Legislature. The organisation works with the Texas Reliability Entity (TRE), one of eight regional entities within the North American Electric Reliability Corporation (NERC) that coordinate to improve the reliability of the bulk power grid.
In 2024, the U.S. Department of Energy announced a contract award of $360 million to help build Pattern Energy’s Southern Spirit Transmission Project, a proposed 320-mile, 525-kV high-voltage direct current line to connect the ERCOT grid with grids in the Southeast.
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ERCOT's members and customers
The Electric Reliability Council of Texas, Inc. (ERCOT) is an American organisation that operates Texas's electrical grid, the Texas Interconnection. ERCOT manages the flow of electric power to more than 25 million Texas customers, which represents about 90% of the state's electric load.
ERCOT is a membership-based 501(c)(4) nonprofit corporation. Its members include consumers, cooperatives, generators, power marketers, retail electric providers, investor-owned electric utilities (transmission and distribution providers), and municipally owned electric utilities. Membership in ERCOT is open to any entity that meets any of the segment definitions as set forth in the ERCOT Bylaws. Members must be in an organisation that either operates in the ERCOT region or represents consumers within the ERCOT region. A member applicant may join as a corporate, associate or adjunct member and will be subject to the criteria set forth in the ERCOT Bylaws.
ERCOT is governed by a board of directors and subject to oversight by the Public Utility Commission of Texas (PUC) and the Texas Legislature. The PUC has primary jurisdiction over activities conducted by ERCOT. Three PUC commissioners, including the chair, are appointed by the governor of Texas. The ERCOT organisation is governed by a board of directors made up of independent members, consumers and representatives from each of ERCOT's electric market segments. The Technical Advisory Committee (TAC) makes policy recommendations to the ERCOT Board of Directors. The TAC is assisted by five standing subcommittees, numerous workgroups, and task forces. The ERCOT board appoints ERCOT's officers to direct and manage ERCOT's day-to-day operations, accompanied by a team of executives and managers responsible for critical components of ERCOT's operation.
ERCOT's customers include the 25 million Texas customers who receive electricity through the Texas Interconnection. During a major cold-weather event in mid-February 2021, ERCOT declared a statewide emergency due to a 34,000 MW shortfall in generation that caused widespread blackouts. Approximately 4 million customers in Texas were without electricity for various times during the multi-day storm.
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Frequently asked questions
No, ERCOT does not sell electricity to other states. The Electric Reliability Council of Texas (ERCOT) manages the flow of electric power on the Texas Interconnection, which supplies power to Texas only.
The Texas grid is independent from the country's two other electrical grids in the eastern and western United States. This is due to the 1935 Federal Power Act, which gave the federal government authority to regulate power companies that engaged in interstate commerce. Texas power companies agreed not to sell power outside of the state, allowing them to avoid federal regulation.
Texas has a few ties to the eastern grid and the Mexican grid, which allow for small transfers of power. However, Texas is unable to borrow large amounts of power from other states due to its independent grid.
