Home/Service Area
Territory

Across the Western
United States

ESS is headquartered in Arizona and works across the Western grid, with a satellite office in Florida. Each page below covers a state’s generation mix, its transmission and distribution challenges, and the major utilities operating there.

Home base
Arizona
Arizona Public Service (APS), Salt River Project (SRP)
Core market
California
Pacific Gas & Electric (PG&E), Southern California Edison (SCE)
Core market
Nevada
NV Energy (Nevada Power in the south, Sierra Pacific Power in the north), Valley Electric Association and other rural cooperatives
Service territory
New Mexico
Public Service Company of New Mexico (PNM), El Paso Electric (southern New Mexico)
Service territory
Utah
Rocky Mountain Power (PacifiCorp), Utah Associated Municipal Power Systems (UAMPS)
Service territory
Colorado
Xcel Energy (Public Service Company of Colorado), Tri-State Generation & Transmission Association
Service territory
Wyoming
Rocky Mountain Power (PacifiCorp), Black Hills Energy (Cheyenne Light, Fuel & Power)
Service territory
Montana
NorthWestern Energy, Montana-Dakota Utilities (MDU)
Service territory
Idaho
Idaho Power, Avista Utilities
Service territory
Washington
Puget Sound Energy (PSE), Avista
Service territory
Oregon
Portland General Electric (PGE), Pacific Power (PacifiCorp)
Service territory
Texas
Oncor, CenterPoint Energy
Service territory
Oklahoma
Oklahoma Gas & Electric (OG&E), Public Service Company of Oklahoma (PSO)
Service territory
Kansas
Evergy, Sunflower Electric Power Corporation
Service territory
Nebraska
Nebraska Public Power District (NPPD), Omaha Public Power District (OPPD)
Service territory
North Dakota
Basin Electric Power Cooperative, Montana-Dakota Utilities (MDU)
Service territory
South Dakota
Black Hills Energy, Xcel Energy
Satellite office
Florida
Florida Power & Light (FPL / NextEra), Duke Energy Florida

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