Our transmission system spans approximately 114,000 square miles with 16,100 circuit miles of transmission lines and approximately 1,300 substations operated at 69 kV to 500 kV. It is the backbone of the electric grid and helps Entergy move power from the power plant to the lines serving customers’ neighborhoods, across an interconnected system of transmission lines and substations.
If the grid and the flow of power were compared to our highway system, transmission lines would be the interstates, substations would be the off-ramps and distribution lines would be the streets and roads that lead to homes and businesses. These high-voltage lines are often seen along highways, interstates or crossing water.
Our grid runs throughout Entergy’s four-state service area, delivering power to wholesale customers such as municipalities and cooperatives, as well as to our 3 million customers of Entergy Arkansas, LLC; Entergy Louisiana, LLC; Entergy Mississippi, LLC; Entergy New Orleans, LLC; and Entergy Texas, Inc. We also deliver power directly to large commercial and industrial retail customers, including refineries, chemical plants, oil and gas processing facilities, pumping stations and large manufacturing sites vital to the region and nation.
The transmission system is regulated by the Federal Energy Regulatory Commission and retail regulators, including the Arkansas Public Service Commission, the Louisiana Public Service Commission, the Mississippi Public Service Commission, the City Council for the City of New Orleans and the Public Utility Commission of Texas. We are part of the Eastern Interconnection, which is the network of interconnected transmission systems that move bulk power throughout the eastern half of the U.S. and eastern Canada.
We are also a member of the Midcontinent Independent System Operator, or MISO, regional transmission organization. MISO has functional control of Entergy's transmission facilities and performs top-down transmission planning in accordance with MISO's Open Access Transmission, Energy and Operating Reserve Markets Tariff (MISO Tariff). The MISO Tariff provides for the development of a comprehensive transmission expansion plan that meets both reliability and economic expansion needs for the entire MISO region.
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