Western Sierra
Recently activeSolar installer based in California · installer record #13815 resolved from 162 public installation records.
Data through: California through Aug 2026 (monthly state program data).
At a glance
Western Sierra is a solar installer with 162 recorded installations totalling 1.1 MW, dated 2011 to 2026. All of its records are in California, where it ranks 1071st of 6,163 profiled installers by volume and 1,722nd of 10,840 nationally. Its median installed price for solar-only systems in 2023–2025 is $4.24/W before incentives, across 28 priced systems.
Track record
Install volume by year
Recorded installs per year; prices by year are in the table below.
Pricing
Price by year (solar only)
| Year | Priced systems | Western Sierra | California median | vs state |
|---|---|---|---|---|
| 2023 | 22 | $4.24/W | $4.06/W | +4% |
| 2022 | 12 | $4.40/W | $4.11/W | +7% |
| 2021 | 8 | $4.40/W | $3.98/W | +11% |
| 2020 | 12 | $4.37/W | $3.97/W | +10% |
| 2019 | 14 | $4.98/W | $3.95/W | +26% |
| 2018 | 10 | $4.36/W | $4.01/W | +9% |
| 2017 | 8 | $4.25/W | $4.05/W | +5% |
| 2016 | 12 | $3.99/W | $4.37/W | −9% |
| 2015 | 6 | $4.21/W | $4.58/W | −8% |
Median installed price per DC watt before incentives, systems without a battery, by the year in the public record. Years with fewer than five priced systems are left out.
Why a company's own figure can differ from this one
- Timing. These prices come from state incentive filings, published about once a year, so the latest full year here is 2025. Prices moved down in many states after 2023; a company's current quotes can be lower (or higher) than its last full year on record.
- Dates. A filing is dated when the program processed it, not when the job was sold, so jobs can land in a different month or year than in the company's own books.
- What the price includes. The filed price is the whole project as reported to the program, which can include loan dealer fees, electrical panel upgrades or roof work. A company's internal figure often leaves those out.
- Batteries. Systems flagged with a battery are excluded here; a battery the filing didn't flag can still raise a year's median.
Equipment
Module, inverter and battery brands
| Equipment | Year | Main brands (share of systems that reported one) | Year before |
|---|---|---|---|
| Modules | 20256 reported | REC 100% | REC 50%2024, 6 reported |
| Inverters | 20256 reported | Enphase 50% · Tesla 50%Main brand changed from Tesla (2024) | Tesla 60%2024, 5 reported |
Manufacturer on each recorded installation, as filed with the state program (Tracking the Sun for earlier years). Brand names are grouped by manufacturer family (e.g. Hanwha Q CELLS and Qcells North America count as Qcells). Not every state reports equipment, and battery brands come mainly from California and New Jersey.
Latest records
Most recent recorded installs
| Date | Location | Size | Price | Ownership |
|---|---|---|---|---|
| Apr 14, 2026 | Benicia, CA | 6.2 kW | — | Host-owned |
| Feb 24, 2026 | CA | 7.3 kW | — | Host-owned · battery |
| Oct 28, 2025 | Orinda, CA | — | $91,300 | Host-owned · battery |
| Aug 16, 2025 | Walnut Creek, CA | 4.6 kW | $17,880 | Host-owned |
| May 1, 2025 | Pinole, CA | 5.9 kW | $22,880 | Host-owned |
| Apr 7, 2025 | Lafayette, CA | 11.3 kW | $56,690 | Host-owned |
| Jan 17, 2025 | Pleasant Hill, CA | — | $65,000 | Host-owned · battery |
| Jan 15, 2025 | Clayton, CA | 9.7 kW | $37,924 | Host-owned |
| Nov 21, 2024 | Clayton, CA | 13.4 kW | $66,000 | Host-owned · battery |
| Nov 12, 2024 | Walnut Creek, CA | — | $91,679 | Host-owned · battery |
See all 162 installations →searchable & filterable; export to CSV with a free account
Service geography
- California
- 162
Busiest cities
Record
- Installer ID
- PC-13815
- First recorded install
- Jul 15, 2011
- Last recorded install
- Apr 14, 2026
- Priced records
- 131
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How does Western Sierra compare with other installers in California?
By recorded installations Western Sierra ranks 1071st among the 6,163 installers based in California with five or more records. Its 2023–2025 solar-only median of $4.24/W is roughly in line with the California median of $3.95/W on the same basis. Its median system, 6.4 kW, is roughly in line with the state median of 5.9 kW. 1% of its recorded installations are third-party owned (lease or power-purchase agreement), against 29% across California. 12% include battery storage, compared with 16% of California records. Installers of similar recorded volume in California include Cole Williams Electric (162), First American Solar (162) and Renewable Power Solutions (162).
How has Western Sierra's installation volume changed?
Western Sierra's earliest dated installation on record is from 2011. It has recorded installations in 15 calendar years. The busiest year was 2023, with 27 installations. 2025, its latest year with records, has 6. Its median price per watt moved from $6.98/W in 2011 to $3.90/W in 2025. The most recent recorded installation is dated Apr 14, 2026.
Where does Western Sierra install solar?
All recorded installations are in California. The cities with the most of its installations are Walnut Creek, CA (20), Concord, CA (15), Martinez, CA (10), Pleasant Hill, CA (7) and Orinda, CA (7).
Frequently asked questions
How many solar installations has Western Sierra completed?
PanelCensus records 162 installations by Western Sierra, from Jul 15, 2011 to Apr 14, 2026, totalling 1.1 MW of capacity. Public reporting varies by state, so the company's true total may be higher.
What does Western Sierra charge for solar?
For solar-only systems installed in 2023–2025, the median reported price is $4.24/W before incentives, across 28 priced systems. The California median on the same basis is $3.95/W. Across all 131 priced systems since 2011, including battery systems, the median is $4.46/W. Prices are the total project cost reported to state incentive programs, divided by the system's DC watts, so they can include electrical upgrades or other work billed with the solar.
Where does Western Sierra install solar?
All 162 recorded installations are in California, the most of them in Walnut Creek.
Is Western Sierra still installing solar?
The most recent installation attributed to Western Sierra in the public records is dated Apr 14, 2026; 2025 has 6 recorded installations. Records here run California through Aug 2026 (monthly state program data), so the newest installations may not appear yet.
Does Western Sierra install leased or PPA solar systems?
2 recorded installations by Western Sierra (1%) are third-party owned — a lease or power-purchase agreement; across California the share is 29%.
Does Western Sierra install battery storage?
19 recorded installations by Western Sierra (12%) include a battery.
Related installers and places
- All solar installers in California· 6,163 profiles
- Solar installations in California· 2,408,542 records
- Cole Williams Electric· 162 installations
- First American Solar· 162 installations
- Renewable Power Solutions· 162 installations
- Focus Solar Energy· 161 installations
- Solid State Electric· 161 installations
- Solar Service La· 160 installations
Dataset updated . Sources: LBNL Tracking the Sun (through 2025), monthly state program records (California DGStats, NYSERDA, NJ Clean Energy, Illinois Shines) and permit records; installer resolved by exact-normalized name matching and, for state program records, by the systems both sources share.
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 September 21, 2026 — PanelCensus refreshes it as each source publishes new records. See the methodology for how records are matched, cleaned and scored.
Cite as: PanelCensus, “Western Sierra, solar installer (California)”, https://panelcensus.com/installers/california/western-sierra-13815 (data as of September 21, 2026).