We manage and maintain an electric power transmission system that 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 a power plant to the power lines serving customers’ neighborhoods, across an interconnected system of transmission lines and substations.

If the electric grid and the flow of power were compared to the U.S. 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 our 3 million customers of Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans and Entergy Texas, as well as to wholesale customers like municipalities and cooperatives. 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.

Choose a local electric provider below to learn more about select transmission projects:

• Entergy Arkansas
• Entergy Louisiana
• Entergy Mississippi
• Entergy New Orleans
• Entergy Texas

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. Our system is part of the Eastern Interconnection, which is the network of interconnected transmission systems that move bulk power throughout the eastern half of the United States and eastern Canada.

Entergy is 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, or 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.