Solar installations in Napa County, CA
10,729 recorded installations in Napa County, California — capacity, prices and the installers doing the work.
At a glance
Napa County, California has 10,729 recorded solar installations totalling 167.9 MW of capacity — the 33rd-highest count among the 58 California counties with records, and under 1% of the state total. That is about 19.3% of the county's 55,601 housing units, against 16.6% statewide. The median installed price is $4.53/W before incentives, roughly in line with the California median of $4.26/W.
Dataset updated . Sources: LBNL Tracking the Sun + city permit records + state programs + USGS/EIA utility-scale.
Severe-weather exposure: solar sites here have been matched to an average of 0 hail and 1.9 high-wind NOAA storm events — a regional inspection/maintenance signal (proximity, not confirmed damage).
Search every recorded installation in Napa County by installer, size, date and equipment.
Search sites →Independent check:Stanford's DeepSolar detected about 4,911 solar arrays here from 2018 satellite imagery — our recorded data covers roughly 218% of that. A yardstick, not dated records.
Most active
Top installers in Napa County
| # | Installer | Installs here |
|---|---|---|
| 1 | Sunrun | 1,367 |
| 2 | Tesla | 1,279 |
| 3 | Green Stock Solar | 455 |
| 4 | Sunpower | 429 |
| 5 | Ambrose Solar | 290 |
| 6 | Citadel Roofing And Solar | 257 |
| 7 | V3 Electric | 255 |
| 8 | Semper Solaris | 204 |
| 9 | High Definition Solar | 191 |
| 10 | Northern Pacific Power | 189 |
Growth
Installations by year
How does Napa County compare with the rest of California?
The median recorded system in Napa County is 6.18 kW, roughly in line with the state median of 5.92 kW. 19% of installations here are third-party owned (lease or power-purchase agreement), compared with 29% across California. 2,611 systems (24%) of the county's records include battery storage, against 16% statewide. By share of housing units with a recorded system, Napa County ranks 27th of 57 California counties with at least 10 installations.
How has solar adoption changed in Napa County?
The earliest recorded installation in Napa County dates to 2001. The busiest year on record is 2023, with 1,354 installations. 2025 has 867 recorded installations so far. The county's cumulative total rose from 5,287 at the end of 2020 to 10,729 today. Recent years fill in as state programs and permit offices report, so the latest counts are provisional.
Who installs solar in Napa County?
Sunrun has the most recorded installations in Napa County (1,367, 13% of the county's records). Other active installers here include Tesla, Green Stock Solar and Sunpower. Installers based anywhere in California are listed in the state installer directory.
Frequently asked questions
How many homes have solar in Napa County?
PanelCensus records 10,729 solar installations in Napa County, California (167.9 MW of capacity) — about 19.3% of the county's 55,601 housing units (U.S. Census ACS). Coverage depends on California's public reporting, so the true total is likely higher.
How much does solar cost in Napa County?
The median installed price for recorded systems in Napa County is $4.53/W before incentives; the median system is 6.2 kW. The California median is $4.26/W.
Who installs solar in Napa County?
The most active recorded installers in Napa County are Sunrun (1,367), Tesla (1,279) and Green Stock Solar (455).
How much of the solar in Napa County is leased?
2,049 recorded installations (19%) in Napa County are third-party owned — a lease or power-purchase agreement, compared with 29% across California.
How big is a typical solar system in Napa County?
The median recorded system in Napa County is 6.2 kW, against 5.9 kW for California as a whole.
More solar data near Napa County
- Solar in California· 2,413,021 installations
- Solar installers in California
- Solar in Kings County· 15,945 installations
- Solar in Sutter County· 11,740 installations
- Solar in Yuba County· 11,469 installations
- Solar in Tehama County· 8,197 installations
- Solar in Nevada County· 7,613 installations
- Solar in Stanislaus County· 7,204 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 Napa County, California”, https://panelcensus.com/solar/california/napa-county (data as of October 10, 2026).