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California solar decisions
Solar Companies in Westminster, CA: Who Installed the Most Systems in 2025
Utility records show 227 home solar systems connected in Westminster in 2025. Sunrun was the installer of record on 53 of them, followed by SWSS Electrical (30) and Ecosolar USA Electrical LLC (17). 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
- Automated permit
- SolarAPP+ and Energov
- Up to 38.4 kW AC, with paired storage
- City of Westminsterchecked Sep 23, 2026
- 2025 solar permits
- 323
- 2% with storage, 3% issued online
- California Energy Commission (SB 379 reports)checked Sep 23, 2026
- Generation
- SCE
- Westminster is not an OCPA member city
- Orange County Power Authoritychecked Sep 23, 2026
Installers who connected the most home solar systems in Westminster in 2025
| Installer (name as reported) | Systems in 2025 | Jan 2024 to May 2026 | CSLB license |
|---|---|---|---|
| Sunrun | 53 | 126 | 750184 check |
| SWSS Electrical | 30 | 91 | 1004667 check |
| Ecosolar USA Electrical LLC | 17 | 41 | 1045300 check |
| Tesla Energy Operations Inc | 15 | 31 | 888104 check |
| Bright Ops | 11 | 20 | 1020761 check |
| OCP Solar Electrical Services | 8 | 11 | 1134737 check |
| OC Builder One | 7 | 8 | 1130207 check |
| Orange County Contracting Services | 6 | 11 | 1023627 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 Westminster by the numbers
SCE approved 227 home solar systems in Westminster in 2025, from 51 installers; the top three were named on 44% of them. The busiest year since 2021 was 2023, with 450 (2025: -50%). Another 114 were approved from January through May 2026.
2025 mix: 33% leased or on a power purchase agreement, 67% owned by the household; 56% with a battery; median size 5.11 kW DC. Orange County: 40% leased or PPA, 65% with a battery, median 6.75 kW.
| Year | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|
| Systems connected | 187 | 322 | 450 | 256 | 227 |
Hiring a solar company in Westminster
Solar companies in Westminster submit an eligible rooftop design, with or without a paired battery, to SolarAPP+ and then to Energov, the City's online permit system, for an automatically issued permit. SCE supplies both delivery and generation: Westminster is not a member of the Orange County Power Authority. Few Westminster permits have included batteries so far. Compare at least three written bids built on your own SCE bill.
Westminster's automated solar permit
SB 379 requires most California cities and counties to offer an online, automated permitting platform for residential solar systems up to 38.4 kilowatts AC and batteries paired with them. Westminster uses SolarAPP+ for that: licensed contractors submit residential roof-mounted photovoltaic designs for automated review through SolarAPP+ and then through Energov, the City's online software, and the permit is issued automatically.
The SolarAPP+ program lists Westminster as accepting solar with storage, main panel upgrades and main breaker derates, a wider scope than some Orange County cities allow. Even so, the City's 2025 report to the Energy Commission counts 323 residential solar permits, only 9 issued online. Most installers are still filing the conventional way, so ask each bidder which route it will use and how long its last Westminster permit took.
What a Westminster quote needs to explain
| Check | Ask each bidder |
|---|---|
| Automated route | Say whether the design fits SolarAPP+ and Energov, and who files it. |
| SCE plan | Model SCE's Solar Billing Plan, including the added credit for enrolling before 2028. |
| Battery choice | Show the bill with and without a battery, on the same panel layout. |
| Panel work | Say whether a main panel upgrade or breaker derate is needed; both fit SolarAPP+ here. |
Related Westminster project questions
Use these guides to prepare the specific questions a written bid needs to answer.
A comparison to ask for
Only 7 of Westminster's 323 residential solar permits in 2025 included a battery. That makes a solar-only bid normal here, but not automatically right: SCE's credits for exports are worth less than the power you buy, so ask each bidder to show your bill with and without storage, using the same panel layout.
Verify the company behind the Westminster quote
Match the business name and license number on each Westminster 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 Westminster rates and bills page.
Westminster solar quote questions
What are the best solar companies in Westminster, CA?
This site does not rank them. Shortlist companies with a CSLB license covering solar that are registered with SolarAPP+ and confirm your address in writing, then compare at least three written bids for the same system built on your own SCE bill.
Does Westminster have instant solar permits?
Yes, for eligible systems. Licensed contractors submit roof-mounted designs through SolarAPP+ and then Energov for an auto-issued permit, covering systems up to 38.4 kW AC and batteries paired with them. Only 9 of the 323 permits the City reported for 2025 were issued online, so ask whether your installer will use it.
Can I add a Tesla Powerwall or other battery in Westminster?
Yes. The City's automated route covers a residential battery paired with a solar system of up to 38.4 kW AC. Adding storage changes the savings math on SCE's Solar Billing Plan, so ask for the battery as its own line with its usable kWh.
How many solar permits does Westminster issue?
Westminster reported 323 residential solar permits to the California Energy Commission for 2025. Of those, 7, about 2%, included battery storage, and 9, about 3%, were issued online.
Before you sign anything in Westminster
Two of the contract terms that most often change what a quote really costs.
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