Electric utilities in Maine
Every electric utility serving Maine in EIA data year 2025, with ownership type, grid operator, balancing authority, customers and the counties each one serves.
Retail electric utilities in Maine
Sorted by customers. See Maine on the map, and the state regulator, Maine Public Utilities Commission.
| Utility | EIA ID | Type | ISO or region | Balancing authority | Customers | Counties served |
|---|---|---|---|---|---|---|
| Central Maine Power CoCentral Maine Power (Avangrid) | 3266 | Investor-owned | ISO-NE | ISNE | 618,572 | 14 Androscoggin, Cumberland, Franklin, Hancock, Kennebec, Knox, Lincoln, Oxford, Penobscot, Piscataquis, Sagadahoc, Somerset, Waldo, York |
| Emera MaineVersant Power (formerly Emera Maine) | 1179 | Investor-owned | ISO-NE | ISNE, NBSO | 159,122 | 6 Aroostook, Hancock, Penobscot, Piscataquis, Waldo, Washington |
| Eastern Maine Electric Coop | 5609 | Cooperative | Other (no ISO) | NBSO | 12,608 | 3 Aroostook, Penobscot, Washington |
| Kennebunk Light & Power Dist | 10144 | Municipal | ISO-NE | ISNE | 7,006 | 1 York |
| Houlton Water Company | 8883 | Municipal | Other (no ISO) | NBSO | 5,520 | 1 Aroostook |
| Town of Madison - (ME) | 11477 | Municipal | ISO-NE | ISNE | 2,513 | 1 Somerset |
| Fox Islands Electric Coop, Inc | 8780 | Cooperative | ISO-NE | ISNE | 2,043 | 1 Knox |
| Van Buren Light & Power Dist | 19702 | Municipal | Other (no ISO) | NBSO | 1,457 | 1 Aroostook |
| Matinicus Plantation Elec Co | 11844 | Municipal | Other (no ISO) | — | 136 | 1 Knox |
Which utilities serve each county in Maine
Retail power marketers and other entities in Maine
Competitive suppliers, wholesale marketers, transmission-only companies and behind-the-meter providers that report to EIA for Maine. They have no county service territory of their own.
| Entity | EIA ID | Type | ISO or region | Customers |
|---|---|---|---|---|
| Electricity Maine, LLC | 58085 | Retail power marketer | ISO-NE | 62,517 |
| Clearview Electric Inc. | 58974 | Retail power marketer | ISO-NE | 18,129 |
| Constellation NewEnergy, Inc | 13374 | Retail power marketer | ISO-NE | 10,153 |
| FairPoint Energy LLC | 58158 | Retail power marketer | Other (no ISO) | 8,981 |
| Ambit Energy Holdings, LLC | 56212 | Retail power marketer | ISO-NE | 8,873 |
| Think Energy, LLC | 65310 | Retail power marketer | ISO-NE | 4,989 |
| North American Power and Gas, LLC | 58667 | Retail power marketer | ISO-NE | 4,497 |
| EverBright, LLC | 66036 | Behind-the-meter provider | ISO-NE | 1,670 |
| Town Square Energy | 59059 | Retail power marketer | ISO-NE | 1,476 |
| C. N. Brown Electricity, LLC | 58196 | Retail power marketer | ISO-NE | 1,373 |
| XOOM Energy Maine, LLC | 58630 | Retail power marketer | ISO-NE | 1,345 |
| First Point Power, LLC | 59793 | Retail power marketer | ISO-NE | 917 |
| Direct Energy Business | 18193 | Retail power marketer | ISO-NE | 727 |
| ENGIE Resources LLC | 19107 | Retail power marketer | ISO-NE | 200 |
| NextEra Energy Services, LLC | 7279 | Retail power marketer | ISO-NE | 169 |
| BP Energy Retail LLC | 64314 | Retail power marketer | ISO-NE | 63 |
| Champion Energy Services | 54862 | Retail power marketer | ISO-NE | 42 |
| Texas Retail Energy, LLC | 50046 | Retail power marketer | ISO-NE | 34 |
| Great American Gas & Electric, LLC | 67589 | Retail power marketer | ISO-NE | 17 |
| Calpine Energy Solutions, LLC | 16840 | Retail power marketer | ISO-NE | 7 |
| SmartestEnergy US LLC | 63356 | Retail power marketer | ISO-NE | 7 |
| Freedom Energy | 54873 | Retail power marketer | ISO-NE | 6 |
| New Brunswick Power Generation Corp. | 58364 | Retail power marketer | Other (no ISO) | 6 |
| SolarCity Corporation | 57313 | Behind-the-meter provider | ISO-NE | 4 |
| American PowerNet | 49730 | Retail power marketer | ISO-NE | 1 |
| Calpine Power America LLC | 2830 | Retail power marketer | ISO-NE | 1 |
| Greenskies Renewable Energy, LLC | 61823 | Behind-the-meter provider | ISO-NE | 1 |
| Linde Energy Services, Inc. | 1611 | Retail power marketer | ISO-NE | 1 |
| Maine Electric Power Co, Inc | 11521 | Transmission-only | ISO-NE | — |
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 Maine. 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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