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Solar Companies in Winchester, CA: Who Installed the Most Systems in 2025
Utility records show 1,131 home solar systems connected in Winchester in 2025. Sunrun was the installer of record on 457 of them, followed by Sunpower Corporation Systems (215) and Sunnova Energy Corporation (112). The table lists each company's CSLB license number. It is a count from public records, not a ranking or endorsement: check each license and get at least three quotes.
California Rate Relief is a private solar referral service.
Key facts
- Electric utility
- SCE
- 34.4¢/kWh average residential rate, CPUC
- CPUC Public Advocates Officechecked Sep 22, 2026
Installers who connected the most home solar systems in Winchester in 2025
| Installer (name as reported) | Systems in 2025 | Jan 2024 to May 2026 | CSLB license |
|---|---|---|---|
| Sunrun | 457 | 857 | 750184 check |
| Sunpower Corporation Systems | 215 | 1,016 | 890895 check |
| Sunnova Energy Corporation | 112 | 199 | 1003498 check |
| Complete Solar Inc | 56 | 60 | 961988 check |
| G A F Energy LLC | 54 | 103 | 1062345 check |
| Lifestyle Solar Inc | 41 | 73 | 922659 check |
| Energy Service Partners Inc DBA ESP Contracting | 16 | 21 | 619149 check |
| New Day Solar | 12 | 18 | 812958 check |
Counts from utility records, not a ranking or endorsement. Check each license's status and complaint history on the CSLB's Check a License page (checked Sept. 24, 2026).
Source: California Distributed Generation Statistics (CPUC), Interconnected Project Sites data set, data through May 31, 2026 (checked Sept. 24, 2026).
Home solar in Winchester by the numbers
SCE approved 1,131 home solar systems in Winchester in 2025, from 67 installers; the top three were named on 69% of them. The busiest year since 2021 was 2023, with 1,286 (2025: -12%). Another 497 were approved from January through May 2026.
2025 mix: 45% leased or on a power purchase agreement, 55% owned by the household; 37% with a battery; median size 4.05 kW DC. Riverside County: 57% leased or PPA, 75% with a battery, median 6.48 kW.
| Year | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|
| Systems connected | 761 | 979 | 1,286 | 1,149 | 1,131 |
Who connects a Winchester solar system
SCE connected every Winchester system in the 2025 records. A new Winchester system on SCE goes on the CPUC Net Billing Tariff; the key facts above give SCE's average rate.
Verify the company behind the Winchester quote
Match the business name and license number on each Winchester proposal to the CSLB record, then use our contractor verification steps, the quote comparison guide and the PPA, loan, lease and cash comparison. What you pay the utility today is on the Winchester rates and bills page.
Permit fees and the filing route are on the Winchester solar cost and permit page.
Before you sign anything in Winchester
Two of the contract terms that most often change what a quote really costs.
Frequently asked questions
Which solar companies install the most systems in Winchester?
In 2025 interconnection records, Sunrun was the installer on 457 home systems in Winchester, Sunpower Corporation Systems on 215 and Sunnova Energy Corporation on 112, out of 1,131. Since January 2024 the same companies were named on 857, 1,016, 199 systems. That is a count, not a ranking.
Do most Winchester homeowners buy or lease their solar?
Of 1,131 home systems connected in Winchester in 2025, 45% were leased or on a power purchase agreement and 37% had a battery; the median size was 4.05 kW DC.
How do I check a Winchester solar company's license?
Look the number up on the CSLB's Check a License page. For the companies named on the most Winchester systems in 2025, the applications list 750184 for Sunrun, 890895 for Sunpower Corporation Systems and 1003498 for Sunnova Energy Corporation. The CSLB record shows the status, classification and any complaint disclosure.
Ask for a competing quote
Start with the utility on your bill and what you pay in a typical month. Contact details come after that. Submitting does not guarantee that a provider will quote your project.
California Rate Relief is a referral service. We are not a licensed contractor. California Rate Relief is compensated by a solar provider when a homeowner we refer signs an agreement. How we make money
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