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Entergy

Transmission System Facts

  • Approximately 15,700 circuit miles of transmission lines operated at 69 kV to 500 kV and approximately 1,500 substations.
  • Serves five operating companies: Entergy Arkansas, Inc.; Entergy Louisiana, LLC; Entergy Mississippi, Inc.; Entergy New Orleans, Inc.; and Entergy Texas, Inc.
  • Regulated by six regulatory agencies: 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.
  • Transmission Owner member of the Midcontinent Independent System Operator (MISO) regional transmission organization. MISO controls 66,000 miles of transmission lines in 15 states and one Canadian province, covering a footprint of 900,000 square miles from Canada to the Gulf of Mexico.
  • The Entergy operating companies are members of the SERC Reliability Corporation. SERC serves as a regional entity with delegated authority from the North American Electric Reliability Corporation (NERC) for the purpose of proposing and enforcing reliability standards within the SERC region. SERC is one of eight regional entities with delegated authority from NERC; the regional entities and all members of NERC work to safeguard the reliability of the bulk power systems throughout North America.