How many solar farms are in Maine?

Maine has 177 operating utility-scale solar farms with 1.0 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest solar farm in Maine?

Three Corners Solar in Waldo County, Maine is the largest, at 110 MW. It came online in 2024.

How many solar farms were built in Maine in 2025?

8 solar farms came online in Maine in 2025, with 35 MW of capacity.

Who is developing solar farms in Maine?

Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.

Solar farms in Maine

Maine has 177 operating solar farms with 1.0 GW of capacity. 8 came online in 2025.

Operating177

See planned solar farms in Maine

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

Maine had 3 solar farms online in 2017 and 177 in 2026

169

177

2017’172018’182019’192020’202021’212022’222023’232024’242025’252026’26

Solar farms online at the end of each year. Source: EIA-860M, compiled by Cleanview.

The 10 largest solar farms in Maine

Operating, by capacity

#	Solar farm	County	Year online	Capacity
1	Three Corners Solar	Waldo County	2024	110 MW
2	Farmington Solar	Franklin County	2021	77 MW
3	Sanford Solar	York County	2020	49 MW
4	Milo PV - BD Solar 1 LLC	Piscataquis County	2021	20 MW
5	Walden Solar Maine V	Androscoggin County	2024	20 MW
6	Mousam River Solar	York County	2025	20 MW
7	Pittsfield Solar LLC	Somerset County	2017	10 MW
8	Oxford PV - BD Solar Oxford LLC	Oxford County	2021	9 MW
9	Augusta PV - BD Solar Augusta LLC	Kennebec County	2021	7 MW
10	BD Solar Hancock LLC	Hancock County	2022	7 MW

Solar farms that came online most recently in Maine

Newest first

#	Solar farm	County	Year online	Capacity
1	USS Weld Solar LLC	Franklin County	2025	1 MW
2	Mousam River Solar	York County	2025	20 MW
3	REDP - Trenton	Hancock County	2025	5 MW
4	Lisbon CSG LLC	Androscoggin County	2025	1 MW
5	Boundary Line Solar, LLC	Cumberland County	2025	1 MW
6	Turner CSG LLC	Androscoggin County	2025	1 MW
7	Water Line Solar, LLC	Cumberland County	2025	1 MW
8	BWC Jimmie Pond	Penobscot County	2025	5 MW
9	Walden Solar Maine V	Androscoggin County	2024	20 MW
10	Cenergy - Pulk	Androscoggin County	2024	5 MW

The developer behind each project is on paid plans. See plans

How Cleanview tracks solar farms

Operating solar farms come from the EIA's monthly survey of power plants. Planned projects come from the grid operators' interconnection queues. We research who is developing each one, since a queue lists a project company, not its owner.

Questions about solar farms in Maine

How many solar farms are in Maine?: Maine has 177 operating utility-scale solar farms with 1.0 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest solar farm in Maine?: Three Corners Solar in Waldo County, Maine is the largest, at 110 MW. It came online in 2024.
How many solar farms were built in Maine in 2025?: 8 solar farms came online in Maine in 2025, with 35 MW of capacity.
Who is developing solar farms in Maine?: Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.