U.S. Electric Utility Directory · Arizona

Electric utilities in Arizona

Every electric utility serving Arizona in EIA data year 2025, with ownership type, grid operator, balancing authority, customers and the counties each one serves.

Compiled October 31, 2026. Grid operators present: West (no ISO).

Retail utilities485 investor-owned, 11 co-ops, 7 municipal
All entities59Including marketers and other filers
Counties covered15With at least one utility listed
Retail customers3,141,730Sum of utility customer counts

Retail electric utilities in Arizona

Sorted by customers. See Arizona on the map, and the state regulator, Arizona Corporation Commission.

48 retail utilities serving Arizona
UtilityEIA IDTypeISO or regionBalancing authorityCustomersCounties served
Arizona Public Service CoArizona Public Service803Investor-ownedWest (no ISO)AZPS1,235,45114 Apache, Cochise, Coconino, Gila, Graham, Greenlee, Maricopa, Mohave, Navajo, Pima, Pinal, Santa Cruz, Yavapai, Yuma
Salt River Project16572Public power districtWest (no ISO)SRP1,060,0163 Gila, Maricopa, Pinal
Tucson Electric Power CoTucson Electric Power24211Investor-ownedWest (no ISO)TEPC426,4512 Cochise, Pima
UNS Electric, IncUniSource Energy Services (UNS Electric)19728Investor-ownedWest (no ISO)TEPC97,9262 Mohave, Santa Cruz
Sulphur Springs Valley E C Inc18280CooperativeWest (no ISO)WALC51,9794 Cochise, Graham, Pima, Santa Cruz
Trico Electric Cooperative Inc19189CooperativeWest (no ISO)WALC47,0523 Pima, Pinal, Santa Cruz
Mohave Electric Cooperative, I21538CooperativeWest (no ISO)WALC41,2353 Coconino, Mohave, Yavapai
Navopache Electric Coop, Inc13318CooperativeWest (no ISO)PNM39,7634 Apache, Gila, Greenlee, Navajo
Navajo Tribal Utility Authority13314State authorityWest (no ISO)PACE29,3053 Apache, Coconino, Navajo
Electrical Dist No3 Pinal County30518Public power districtWest (no ISO)AZPS24,9441 Pinal
City of Mesa - (AZ)12351MunicipalWest (no ISO)WALC16,8171 Maricopa
USBIA-San Carlos Project19604FederalWest (no ISO)WALC12,4015 Gila, Graham, Maricopa, Pima, Pinal
Graham County Electric Coop Inc7456CooperativeWest (no ISO)WALC7,6531 Graham
Electrical Dist No2 Pinal County15048Public power districtWest (no ISO)WALC5,0271 Pinal
City of Safford - (AZ)16538MunicipalWest (no ISO)WALC4,8471 Graham
Page Utility Enterprises14373MunicipalWest (no ISO)WALC4,3851 Coconino
Tohono O'Odham Utility Authority14543Public power districtWest (no ISO)AZPS3,8893 Maricopa, Pima, Pinal
Wellton-Mohawk Irr & Drain Dist25060Public power districtWest (no ISO)WALC3,5851 Yuma
Gila River Indian Utility Authority (GRICUA)New since 201865261CooperativeWest (no ISO)WALC3,4662 Maricopa, Pinal
Morenci Water and Electric12919Investor-ownedWest (no ISO)WALC2,6961 Greenlee
Dixie Escalante R E A, Inc40165CooperativeWest (no ISO)PACE2,4931 Mohave
Electrical Dist No4 Pinal County15049Public power districtWest (no ISO)WALC2,4881 Pinal
Duncan Valley Elec Coop, Inc5438CooperativeWest (no ISO)WALC2,1052 Graham, Greenlee
Colorado River Indian Irr Proj3990FederalWest (no ISO)WALC2,1041 La Paz
Town of Thatcher- (AZ)18805MunicipalWest (no ISO)WALC1,9911 Graham
City of Williams - AZ56535MunicipalWest (no ISO)AZPS1,8931 Coconino
Hohokam Irr & Drain Dist8700Public power districtWest (no ISO)WALC1,7441 Pinal
Town of Wickenburg20618MunicipalWest (no ISO)AZPS1,4551 Maricopa
Garkane Energy Coop, Inc6957CooperativeWest (no ISO)WALC1,4032 Coconino, Mohave
Ajo Improvement Co176Investor-ownedWest (no ISO)AZPS9921 Pima
City of Fredonia - (AZ)6753MunicipalWest (no ISO)WALC8121 Coconino
Electrical Dist No8 Maricopa5729Public power districtWest (no ISO)AZPS6241 Maricopa
Aha Macav Power Service58123Public power districtWest (no ISO)WALC5851 Mohave
Columbus Electric Coop, Inc4071CooperativeWest (no ISO)PNM4921 Cochise
Ak-Chin Electric Utility Authority25866State authorityWest (no ISO)AZPS4691 Pinal
Roosevelt Irrigation District16273Public power districtWest (no ISO)SRP1890 —
McMullen Valley Water C&D Dist12191Public power districtWest (no ISO)AZPS1750 —
Maricopa County M W C Dist #140355Public power districtWest (no ISO)AZPS1371 Maricopa
Electrical Dist No6 Pinal County40357Public power districtWest (no ISO)SRP1240 —
Ocotillo Water Conserv. Dist.13961Public power districtWest (no ISO)SRP1231 Maricopa
Harquahala Valley Pwr District8139Public power districtWest (no ISO)AZPS1151 Maricopa
Electrical Dist No7 Maricopa21239Public power districtWest (no ISO)AZPS1080 —
Buckeye Water C&D District2469Public power districtWest (no ISO)AZPS940 —
Aguila Irrigation District737Public power districtWest (no ISO)AZPS560 —
Tonopah Irrigation District19016Public power districtWest (no ISO)AZPS531 Maricopa
WAPA-- Western Area Power Administration27000FederalWest (no ISO)WALC1812 Apache, Cochise, Coconino, Gila, La Paz, Maricopa, Mohave, Navajo, Pima, Pinal, Yavapai, Yuma
Arizona Electric Pwr Coop Inc796CooperativeWest (no ISO)——0 —
Arizona Power Authority798State authorityWest (no ISO)——0 —

Which utilities serve each county in Arizona

15 counties, with the grid operator serving most customers
CountyFIPSISO or regionUtilitiesUtilities serving the county
Apache04001West (no ISO)4Arizona Public Service Co, Navopache Electric Coop, Inc, Navajo Tribal Utility Authority, WAPA-- Western Area Power Administration
Cochise04003West (no ISO)5Tucson Electric Power Co, Arizona Public Service Co, Sulphur Springs Valley E C Inc, Columbus Electric Coop, Inc, WAPA-- Western Area Power Administration
Coconino04005West (no ISO)8Arizona Public Service Co, Mohave Electric Cooperative, I, Navajo Tribal Utility Authority, Page Utility Enterprises, City of Williams - AZ, City of Fredonia - (AZ), Garkane Energy Coop, Inc, WAPA-- Western Area Power Administration
Gila04007West (no ISO)5Salt River Project, Arizona Public Service Co, Navopache Electric Coop, Inc, USBIA-San Carlos Project, WAPA-- Western Area Power Administration
Graham04009West (no ISO)7Arizona Public Service Co, Sulphur Springs Valley E C Inc, Graham County Electric Coop Inc, City of Safford - (AZ), USBIA-San Carlos Project, Town of Thatcher- (AZ), Duncan Valley Elec Coop, Inc
Greenlee04011West (no ISO)4Arizona Public Service Co, Navopache Electric Coop, Inc, Morenci Water and Electric, Duncan Valley Elec Coop, Inc
La Paz04012West (no ISO)2Colorado River Indian Irr Proj, WAPA-- Western Area Power Administration
Maricopa04013West (no ISO)13Salt River Project, Arizona Public Service Co, City of Mesa - (AZ), USBIA-San Carlos Project, Gila River Indian Utility Authority (GRICUA), Town of Wickenburg, Tohono O'Odham Utility Authority, Electrical Dist No8 Maricopa, Maricopa County M W C Dist #1, Ocotillo Water Conserv. Dist., Harquahala Valley Pwr District, Tonopah Irrigation District, WAPA-- Western Area Power Administration
Mohave04015West (no ISO)7Arizona Public Service Co, UNS Electric, Inc, Mohave Electric Cooperative, I, Dixie Escalante R E A, Inc, Garkane Energy Coop, Inc, Aha Macav Power Service, WAPA-- Western Area Power Administration
Navajo04017West (no ISO)4Arizona Public Service Co, Navopache Electric Coop, Inc, Navajo Tribal Utility Authority, WAPA-- Western Area Power Administration
Pima04019West (no ISO)8Tucson Electric Power Co, Arizona Public Service Co, Trico Electric Cooperative Inc, Sulphur Springs Valley E C Inc, USBIA-San Carlos Project, Tohono O'Odham Utility Authority, Ajo Improvement Co, WAPA-- Western Area Power Administration
Pinal04021West (no ISO)12Salt River Project, Arizona Public Service Co, Electrical Dist No3 Pinal County, Trico Electric Cooperative Inc, Electrical Dist No2 Pinal County, Electrical Dist No4 Pinal County, USBIA-San Carlos Project, Hohokam Irr & Drain Dist, Gila River Indian Utility Authority (GRICUA), Tohono O'Odham Utility Authority, Ak-Chin Electric Utility Authority, WAPA-- Western Area Power Administration
Santa Cruz04023West (no ISO)4Arizona Public Service Co, UNS Electric, Inc, Trico Electric Cooperative Inc, Sulphur Springs Valley E C Inc
Yavapai04025West (no ISO)3Arizona Public Service Co, Mohave Electric Cooperative, I, WAPA-- Western Area Power Administration
Yuma04027West (no ISO)3Arizona Public Service Co, Wellton-Mohawk Irr & Drain Dist, WAPA-- Western Area Power Administration

Retail power marketers and other entities in Arizona

Competitive suppliers, wholesale marketers, transmission-only companies and behind-the-meter providers that report to EIA for Arizona. They have no county service territory of their own.

EntityEIA IDTypeISO or regionCustomers
SolarCity Corporation57313Behind-the-meter providerWest (no ISO)42,085
Sunrun Inc.59647Behind-the-meter providerWest (no ISO)18,205
SunPower Capital, LLC59580Behind-the-meter providerCAISO9,789
Palmetto Solar, LLC66026Behind-the-meter providerWest (no ISO)5,524
EverBright, LLC66036Behind-the-meter providerWest (no ISO)1,951
Sunnova59579Behind-the-meter providerWest (no ISO)1,406
Spruce Finance59943Behind-the-meter providerWest (no ISO)1,005
Greenbacker Renewable Energy Corporation60025Behind-the-meter providerWest (no ISO)493
TerraForm US Energy Services, LLC60981Behind-the-meter providerWest (no ISO)28
Constellation Solar Holding, LLC59086Behind-the-meter providerWest (no ISO)10
Greenskies Renewable Energy, LLC61823Behind-the-meter providerWest (no ISO)1

About this data

Which utilities exist comes from the U.S. Energy Information Administration’s Form EIA-861 and EIA-861S, data year 2025 (final release, October 7, 2026), read directly from eia.gov. County service territories, balancing authority codes and customer counts come from EIA-861 for 2018, the latest year compiled at county level for this directory; utilities that started reporting after 2018 carry their 2025 values. County boundaries are U.S. Census cartographic boundaries (us-atlas 3.0, Albers USA projection).

Customer counts are per utility within Arizona. A county’s grid operator is the one serving most of its customers, estimated by spreading each utility’s customers evenly over its counties. Download every state in one file from the U.S. Electric Utility Directory.

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