Electric utilities in Hawaii
Every electric utility serving Hawaii in EIA data year 2025, with ownership type, grid operator, balancing authority, customers and the counties each one serves.
Retail electric utilities in Hawaii
Sorted by customers. See Hawaii on the map, and the state regulator, Hawaii Public Utilities Commission.
| Utility | EIA ID | Type | ISO or region | Balancing authority | Customers | Counties served |
|---|---|---|---|---|---|---|
| Hawaiian Electric Co IncHawaiian Electric (Oahu) | 19547 | Investor-owned | Hawaii (no ISO) | HECO | 305,456 | 1 Honolulu |
| Hawaii Electric Light Co IncHawaiian Electric (Hawaii Island) | 8287 | Investor-owned | Hawaii (no ISO) | — | 85,758 | 1 Hawaii |
| Maui Electric Co LtdHawaiian Electric (Maui County) | 11843 | Investor-owned | Hawaii (no ISO) | — | 71,649 | 2 Kalawao, Maui |
| Kauai Island Utility Cooperative | 10071 | Cooperative | Hawaii (no ISO) | — | 33,860 | 1 Kauai |
Which utilities serve each county in Hawaii
| County | FIPS | ISO or region | Utilities | Utilities serving the county |
|---|---|---|---|---|
| Hawaii | 15001 | Other (no ISO) | 1 | Hawaii Electric Light Co Inc |
| Honolulu | 15003 | Other (no ISO) | 1 | Hawaiian Electric Co Inc |
| Kalawao | 15005 | Other (no ISO) | 1 | Maui Electric Co Ltd |
| Kauai | 15007 | Other (no ISO) | 1 | Kauai Island Utility Cooperative |
| Maui | 15009 | Other (no ISO) | 1 | Maui Electric Co Ltd |
Retail power marketers and other entities in Hawaii
Competitive suppliers, wholesale marketers, transmission-only companies and behind-the-meter providers that report to EIA for Hawaii. They have no county service territory of their own.
| Entity | EIA ID | Type | ISO or region | Customers |
|---|---|---|---|---|
| Sunrun Inc. | 59647 | Behind-the-meter provider | Hawaii (no ISO) | 5,607 |
| SolarCity Corporation | 57313 | Behind-the-meter provider | Hawaii (no ISO) | 4,698 |
| SunPower Capital, LLC | 59580 | Behind-the-meter provider | Hawaii (no ISO) | 1,017 |
| Sunnova | 59579 | Behind-the-meter provider | Hawaii (no ISO) | 343 |
| Spruce Finance | 59943 | Behind-the-meter provider | Hawaii (no ISO) | 169 |
| Greenbacker Renewable Energy Corporation | 60025 | Behind-the-meter provider | Hawaii (no ISO) | 134 |
| TerraForm US Energy Services, LLC | 60981 | Behind-the-meter provider | Hawaii (no ISO) | 9 |
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 Hawaii. 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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