Solar installations in Maine
22,412 recorded installations — prices, growth by year, county breakdown and the installers doing the work.
At a glance
Maine has 22,412 recorded solar installations totalling 2.8 GW of capacity — the 21st-highest count among the 50 states and DC with installation records in PanelCensus. That is about 3.0% of the state's 746,552 housing units. The median installed price is $3.71/W before incentives, about 12% below the national median of $4.23/W.
Dataset updated . Sources: LBNL Tracking the Sun + city permit records + state programs + USGS/EIA utility-scale.
Most active
Top installers in Maine
| # | Installer | Installs in ME |
|---|
Growth
Installations by year
New installs per year and the running cumulative total, plus % of homes with solar (ACS housing units).
By county
Solar by county in Maine
| County | Installs | % homes | Capacity | Median $/W |
|---|---|---|---|---|
| Androscoggin County | 473 | 0.94% | 212.3 MW | — |
| Cumberland County | 117 | 0.08% | 85.1 MW | — |
| Kennebec County | 66 | 0.10% | 214.6 MW | — |
| York County | 66 | 0.06% | 209.6 MW | — |
| Lincoln County | 45 | 0.19% | 43.8 MW | — |
| Somerset County | 41 | 0.14% | 169.2 MW | — |
| Aroostook County | 38 | 0.10% | 114.0 MW | — |
| Knox County | 36 | 0.15% | 30.6 MW | — |
| Oxford County | 36 | 0.10% | 83.6 MW | — |
| Waldo County | 36 | 0.16% | 66.3 MW | — |
| Penobscot County | 24 | 0.03% | 88.2 MW | — |
| Franklin County | 23 | 0.11% | 65.4 MW | — |
| Sagadahoc County | 19 | 0.10% | 23.7 MW | — |
| Hancock Countylimited | 7 | 0.02% | 18.9 MW | — |
| Piscataquis Countylimited | 7 | 0.05% | 49.1 MW | — |
| Washington Countylimited | 3 | 0.01% | 20.1 MW | — |
Counties derived from installation ZIP codes (Census ZCTA crosswalk) — approximate at boundaries. Counties marked limited have under 10 recorded installs, so their medians and penetration are indicative only. % homes = recorded installs ÷ housing units (U.S. Census ACS 5-Year, B25001).
How does Maine compare with other states?
Maine ranks 21st of the 50 states and DC by recorded installations and 13th by recorded capacity. By share of housing units with a recorded system (3.0%) it ranks 12th of the 50 states and DC. Its median price of $3.71/W is the 6th-lowest of the 23 states with at least 100 priced systems. The median system is 8.4 kW, about 24% above the national median of 6.8 kW.
How has solar grown in Maine?
The earliest installations on record in Maine date to 1998. Annual volume peaked in 2024 with 4,826 recorded installations. 2025, the latest completed year, has 4,487 recorded installations so far. The cumulative total grew from 7,340 at the end of 2020 to 22,412 today. Counts for the most recent year or two keep rising as state programs and permit offices report, so a dip at the end of the series is a reporting lag rather than a fall in installations.
Which counties in Maine have the most solar?
Recorded installations span 16 counties. Androscoggin County leads with 473 (2% of the state total), followed by Cumberland County (117) and Kennebec County (66). Androscoggin County has the highest share of housing units with a recorded system, about 0.94%.
Search every recorded Maine installation — by installer, size, date, storage and equipment.
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Top solar equipment in Maine
| # | Panel manufacturer | Systems |
|---|---|---|
| 1 | roof mounted | 48 |
| 2 | REC Solar | 31 |
| 3 | Hanwha Qcells (Qidong) Co. Ltd. | 25 |
| 4 | Qcells North America | 21 |
| 5 | LONGi Green Energy Technology Co., Ltd. | 8 |
| 6 | CSI Solar Co., Ltd. | 7 |
| 7 | Jinko Solar Co., Ltd | 7 |
| 8 | LG Electronics Inc. | 7 |
| # | Inverter manufacturer | Systems |
|---|---|---|
| 1 | SolarEdge Technologies Ltd. | 21 |
| 2 | ENPHASE | 13 |
| 3 | SMA America | 12 |
| 4 | Fronius International GmbH | 9 |
| 5 | Enphase | 8 |
| 6 | SolarEdge | 8 |
From recorded equipment on Maine systems (Tracking the Sun + state/permit data); counts are systems where the manufacturer is known.
Developers
Top solar developers in Maine
| # | Developer | Systems |
|---|---|---|
| 1 | Versant Power | 9 |
| 2 | ReVision Energy | 6 |
| 3 | Sundog Solar | 4 |
Developer/EPC named on the permit or program record — often the same firm as the installer.
Frequently asked questions
How many solar installations are there in Maine?
PanelCensus records 22,412 solar installations in Maine, totalling 2.8 GW of capacity — about 3.0% of the state's 746,552 housing units (U.S. Census ACS) — compiled from LBNL's Tracking the Sun, city permit records, state programs and USGS/EIA utility-scale data. Coverage depends on what the state publishes, so the true total is likely higher.
How much does solar cost in Maine?
The median installed price across priced systems in Maine is $3.71/W before incentives; the median system is 8.4 kW and the median total price $17,134. The national median is $4.23/W. Year-by-year medians appear on the national price-trends page.
What percentage of homes in Maine have solar?
About 3.0%: 22,412 recorded installations against 746,552 housing units (U.S. Census ACS 5-Year, Table B25001), 12th of the 50 states and DC on this measure.
More on solar in and around Maine
- Solar installers in Maine
- Solar in Androscoggin County· 473 installations
- Solar in Cumberland County· 117 installations
- Solar in Kennebec County· 66 installations
- Solar in Minnesota· 23,724 installations
- Solar in Wisconsin· 22,775 installations
- Solar in Virginia· 18,447 installations
- Solar in Oregon· 17,012 installations
- Solar price trends by year and state
- Third-party ownership by state
About this data
Source: Lawrence Berkeley National Laboratory's Tracking the Sun, merged with city permit records, state incentive programs and the USGS U.S. Large-Scale Solar Photovoltaic Database / EIA-860 plant registers, as published October 10, 2026 — PanelCensus refreshes it as each source publishes new records. See the methodology for how records are matched, cleaned and scored.
Cite as: PanelCensus, “Solar installations in Maine”, https://panelcensus.com/solar/maine (data as of October 10, 2026).