Maine has 133 solar farms in the EIA Form 860 database, with a combined installed capacity of 802 MW. Of those, 2 plants are utility-scale (50 MW or larger). The largest single facility is Three Corners Solar in Unity, Waldo County — a 110 MW plant operated by Three Corners Solar, LLC.
Use the interactive Maine solar farms map below to explore every plant, color-coded by technology type and sized by capacity. Click any solar farm for its name, operator, capacity (MW), technology, and location — or view the full US solar farms interactive map to compare Maine to every other state.
Type
Capacity
Maine Solar Farms by the Numbers
- 133 total solar farms in Maine (EIA Form 860 (US Energy Information Administration), latest reporting period)
- 802 MW total installed solar capacity
- 2 utility-scale plants (50 MW or larger)
- 89 small / community-scale plants (under 5 MW)
Maine Solar Farms by Technology Type
- 133 Solar Photovoltaic (PV) — standard panel installations, the dominant technology nationwide
The 15 Largest Solar Farms in Maine
The largest solar farm in Maine by installed capacity is Three Corners Solar at 110 MW. The 15 largest Maine solar farms from the latest EIA filing:
| # | Solar Farm | Operator | Capacity | Location |
|---|---|---|---|---|
| 1 | Three Corners Solar | Three Corners Solar, LLC | 110 MW | Unity, Waldo |
| 2 | Farmington Solar | Farmington Solar, LLC | 77 MW | Farmington, Franklin |
| 3 | Sanford Solar | Sanford Airport Solar, LLC | 49 MW | Sanford, York |
| 4 | Milo PV – BD Solar 1 LLC | BD Solar 1 LLC | 20 MW | Milo, Piscataquis |
| 5 | Walden Solar Maine V | Walden Solar Maine V LLC | 20 MW | , |
| 6 | Pittsfield Solar LLC | Pittsfiled Solar LLC | 10 MW | Pittsfield, Somerset |
| 7 | Oxford PV – BD Solar Oxford LLC | BD Solar Oxford LLC | 9 MW | Oxford, Oxford |
| 8 | Augusta PV – BD Solar Augusta LLC | BD Solar Augusta LLC | 7 MW | Augusta, Kennebec |
| 9 | Winslow PV – BD Solar 2 LLC | BD Solar 2 LLC | 7 MW | Winslow, Kennebec |
| 10 | BD Solar Ellsworth LLC | BD Solar Hancock North LLC | 7 MW | Augusta, Hancock |
| 11 | BD Solar Hancock LLC | BD Solar Hancock LLC | 7 MW | Augusta, Hancock |
| 12 | BWC Beech Ridge Brook, LLC | Navisun LLC | 5 MW | Scarborough, Cumberland |
| 13 | AES Daigle Solar, LLC | AES Clean Energy | 5 MW | Fort Kent, Aroostook |
| 14 | ME-EDFR-Phase I-Embden | Tower Solar Partners, LLC | 5 MW | Embden, Somerset |
| 15 | Dynamic Madison (CSG) | MN8 Energy LLC | 5 MW | Madison, Somerset |
Top Solar Operators in Maine
Five operators account for the largest share of solar generation in Maine:
- Three Corners Solar, LLC — 1 plant, 110 MW total
- Nautilus Solar Solutions — 25 plants, 108 MW total
- Farmington Solar, LLC — 1 plant, 77 MW total
- Sanford Airport Solar, LLC — 1 plant, 49 MW total
- REA Investments, LLC — 13 plants, 43 MW total
Solar Permitting and Regulation in Maine
Utility-scale solar in Maine is overseen by the Maine Public Utilities Commission. Wholesale market participation and interconnection are regulated by the Federal Energy Regulatory Commission (FERC) and the relevant ISO/RTO. All generators above 1 MW must report capacity, fuel type, and location to the EIA via Form 860 — the dataset used in this map.
Frequently Asked Questions
How many solar farms are in Maine?
Maine has 133 solar farms in the latest EIA Form 860 filing — a combined 802 MW of installed capacity. Of those, 2 are utility-scale (50 MW or larger).
What is the largest solar farm in Maine?
The largest solar farm in Maine is Three Corners Solar, located in Unity (Waldo County), with 110 MW of installed capacity. It is operated by Three Corners Solar, LLC.
How much solar capacity does Maine have?
Maine has 802 MW of installed solar capacity across 133 plants reporting to the EIA. This counts only the solar portion (Solar_MW field) — co-located batteries and other generation are reported separately.
Who regulates solar farms in Maine?
Solar farms in Maine are regulated by the Maine Public Utilities Commission at the state level, with federal oversight from FERC. The EIA collects annual data on every utility-scale solar plant via Form 860.
View all 6,406 US solar farms on the national interactive map
