The Electric Reliability Council of Texas (ERCOT) is responsible for managing the flow of electric power to 24 million Texas customersrepresenting 85 percent of the state's electric load and 75 percent of the Texas land area. ERCOT schedules power on an electric grid that connects 41,500 miles of transmission lines and more than 550 generation units. ERCOT also manages financial settlement for the competitive wholesale bulk-power market and administers customer switching for 6.7 million Texans in competitive choice areas. Learn more information about today's ERCOT:

  • FAQlearn why rolling outages may occur, how they are handled, and much more.

Want to learn about ERCOT's history? ERCOT began during World War II when several electric utilities in Texas banded together as the Texas Interconnected System (TIS) to support the war effort. Participants sent their excess power generation to industrial manufacturing companies on the Gulf Coast to provide reliable supplies of electricity for energy-intensive aluminum smelting. Throughout the process, the utilities realized the reliability advantages they gained from remaining interconnected. So the TIS members continued to use and develop the interconnected grid in the coming years.

ERCOT was formed by TIS in 1970 to comply with North American Reliability Council (NERC) requirements and in 1981, ERCOT became the central operating coordinator for Texas. ERCOT's members include consumers, cooperatives, independent generators, independent power marketers, retail electric providers, investor-owned electric utilities (transmission and distribution providers), and municipal-owned electric utilities.