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California solar decisions
Solar Companies in Thousand Oaks, CA: Who Installed the Most Systems in 2025
Utility records show 392 home solar systems connected in Thousand Oaks in 2025. Sunrun was the installer of record on 95 of them, followed by Tesla Energy Operations Inc (30) and Orange County Contracting Services (25). 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
- Instant permit range
- 1 to 38.4 kW AC
- Roof-mounted residential only, licensed contractors
- City of Thousand Oakschecked Sep 23, 2026
- Supplies the generation
- Clean Power Alliance
- Thousand Oaks default: 100% Green, serving since 2019
- Clean Power Alliancechecked Sep 23, 2026
- CPA surplus rate
- 10% above SCE's
- April true-up; checks for credits over $100
- Clean Power Alliancechecked Sep 23, 2026
Installers who connected the most home solar systems in Thousand Oaks in 2025
| Installer (name as reported) | Systems in 2025 | Jan 2024 to May 2026 | CSLB license |
|---|---|---|---|
| Sunrun | 95 | 232 | 750184 check |
| Tesla Energy Operations Inc | 30 | 84 | 888104 check |
| Orange County Contracting Services | 25 | 37 | 1023627 check |
| Energy Service Partners Inc DBA ESP Contracting | 22 | 45 | 619149 check |
| Shelter Roofing & Solar Construction | 11 | 18 | 624196 check |
| United Electric | 9 | 11 | 378462 check |
| A P Electrical | 8 | 15 | 974115 check |
| Homelink Construction LLC DBA Homelink Solar | 8 | 11 | 1117534 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 Thousand Oaks by the numbers
SCE approved 392 home solar systems in Thousand Oaks in 2025, from 100 installers; the top three were named on 38% of them. The busiest year since 2021 was 2023, with 695 (2025: -44%). Another 208 were approved from January through May 2026.
2025 mix: 39% leased or on a power purchase agreement, 62% owned by the household; 92% with a battery; median size 8.17 kW DC. Ventura County: 44% leased or PPA, 89% with a battery, median 6.8 kW.
| Year | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|
| Systems connected | 435 | 693 | 695 | 313 | 392 |
Hiring a solar company in Thousand Oaks
Thousand Oaks gives licensed solar contractors an instant permit through SolarAPP+ for roof-mounted home systems between 1 and 38.4 kW AC; ground mounts, ballasted racks and carports go through the City's standard permit. Clean Power Alliance supplies generation here at its 100% Green default, with SCE delivering the power. Get three written bids built on your own CPA and SCE bill and compare them on the checks below.
The Thousand Oaks permit split: roof versus everything else
The City of Thousand Oaks calls its SolarAPP+ route the State Solar Permit, a pre-approved or preauthorized solar inspection permit that issues instantly to licensed contractors for compliant systems. It is limited to roof-mounted systems on residential properties between 1 and 38.4 kW AC. Ballasted, ground-mounted and carport systems require a standard solar permit. Any fees for the SolarAPP+ web service are separate from the City's and are settled with SolarAPP+ directly.
The City also reminds owners that it is their duty, or their authorized agent's, to keep the work visible and accessible for inspection. On a hillside lot where a ground mount or a carport is tempting, that split matters: the same kilowatts can come with an instant permit on the roof or a full review off it. Ask each bidder which one it has priced and why.
What a Thousand Oaks quote needs to explain
| Check | Ask each bidder |
|---|---|
| Generation and delivery | Use the provider and rate schedule shown on the bill and separate generation from SCE delivery charges and credits. |
| Permit and electrical scope | Name the permit route and itemize service-panel, subpanel, storage, backup circuits and inspection responsibility. |
| Comparable contract | Compare the same equipment, monthly production, roof work, warranty responsibility and total payment obligations. |
A comparison to ask for
Give each bidder the same twelve months of usage and roof layout. Compare monthly production, cash price, financing obligations and remaining SCE and generation-provider charges. Keep the battery and backup scope separate so one proposal does not look cheaper by omitting it.
Verify the company behind the Thousand Oaks quote
Match the business name and license number on each Thousand Oaks 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 Thousand Oaks rates and bills page.
Permit fees and the filing route are on the Thousand Oaks solar cost and permit page.
Thousand Oaks solar quote questions
Does every Thousand Oaks solar system get an instant permit?
No. The City's SolarAPP+ State Solar Permit covers roof-mounted residential systems from 1 to 38.4 kW AC. Ballasted, ground-mounted and carport systems need a standard solar permit.
What does Clean Power Alliance pay for extra solar in Thousand Oaks?
CPA says its Net Surplus Compensation rates are 10% higher than SCE's. It trues up Solar Billing Plan customers in April, mails a check for credits over $100 and keeps smaller amounts as a bill credit.
Does Clean Power Alliance replace SCE in Thousand Oaks?
No. Clean Power Alliance supplies generation for enrolled customers, while SCE provides delivery and billing. Confirm both on the current bill before comparing proposals.
What should a Thousand Oaks solar quote identify?
It should identify the legal contractor, equipment, roof and electrical scope, permit duties, monthly production inputs, total payment obligations and remaining utility charges.
Before you sign anything in Thousand Oaks
Two of the contract terms that most often change what a quote really costs.
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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