Solar installations in Washington County, ME
3 recorded installations in Washington County, Maine — capacity, prices and the installers doing the work.
At a glance
Washington County, Maine has 3 recorded solar installations totalling 20.1 MW of capacity — the 16th-highest count among the 16 Maine counties with records, and under 1% of the state total. That is about 0.01% of the county's 21,703 housing units, against 3.0% statewide.
Dataset updated . Sources: LBNL Tracking the Sun + city permit records + state programs + USGS/EIA utility-scale.
Search every recorded installation in Washington County by installer, size, date and equipment.
Search sites →Independent check:Stanford's DeepSolar detected about 68 solar arrays here from 2018 satellite imagery — our recorded data covers roughly 4% of that (this county is under-reported in public program data). A yardstick, not dated records.
Most active
Top installers in Washington County
No resolved installers recorded in this county.
Growth
Installations by year
How does Washington County compare with the rest of Maine?
The median recorded system in Washington County is 6800 kW, about 810 times the state median of 8.4 kW. Fewer than 30 systems here report an installed price, so no county price median is published.
How has solar adoption changed in Washington County?
The earliest recorded installation in Washington County dates to 2024.
Frequently asked questions
How many homes have solar in Washington County?
PanelCensus records 3 solar installations in Washington County, Maine (20.1 MW of capacity) — about 0.01% of the county's 21,703 housing units (U.S. Census ACS). Coverage depends on Maine's public reporting, so the true total is likely higher.
How big is a typical solar system in Washington County?
The median recorded system in Washington County is 6,800 kW, against 8.4 kW for Maine as a whole.
More solar data near Washington County
- Solar in Maine· 22,412 installations
- Solar installers in Maine
- Solar in Knox County· 36 installations
- Solar in Oxford County· 36 installations
- Solar in Waldo County· 36 installations
- Solar in Penobscot County· 24 installations
- Solar in Franklin County· 23 installations
- Solar in Sagadahoc County· 19 installations
County assignment is derived from installation ZIP codes via the Census 2020 ZCTA↔county crosswalk (primary county by land-area overlap) — approximate at county boundaries. Market penetration = recorded installations ÷ housing units (U.S. Census Bureau ACS 5-Year, Table B25001); it undercounts where dataset coverage is partial. See methodology.
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 Washington County, Maine”, https://panelcensus.com/solar/maine/washington-county (data as of October 10, 2026).