Solar Companies in Cupertino, CA: Who Installed the Most Systems in 2025

Installers who connected the most home solar systems in Cupertino in 2025

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 Cupertino by the numbers

PG&E approved 309 home solar systems in Cupertino in 2025, from 63 installers; the top three were named on 49% of them. The busiest year since 2021 was 2023, with 436 (2025: -29%). Another 197 were approved from January through May 2026.

2025 mix: 25% leased or on a power purchase agreement, 75% owned by the household; 52% with a battery; median size 6.39 kW DC. Santa Clara County: 30% leased or PPA, 54% with a battery, median 6.48 kW.

Hiring a solar company in Cupertino

Solar companies in Cupertino normally get an instant permit through SolarAPP+ and the City's Citizen Access portal, covering rooftop solar with or without a battery. As of September 23, 2026 the City has paused that route during a business license system upgrade and is taking permits by email. PG&E delivers the power and Silicon Valley Clean Energy supplies it. Compare at least three written bids built on your own bill.

Start with your Cupertino electricity bill

Cupertino is a PG&E delivery city, and Silicon Valley Clean Energy is its official generation provider, so a Cupertino solar bill has two halves: SVCE's generation charges and credits, and PG&E's delivery charges and credits. Have each bidder model both from your own statement, with the solar plan that matches when your system is applied for.

Cupertino's Instant Solar Permit, and the pause

The City's Instant Solar Permit covers roof-mounted solar photovoltaic installations with or without energy storage, and a contractor may include a main electrical service upgrade; only systems on the SolarAPP+ eligibility checklists qualify. The route has four steps: register with SolarAPP+, submit the project and pay its processing fee, currently $25, then apply in Citizen Access with the SolarAPP+ approval documents, the SolarAPP+ inspection checklist and the equipment specifications. When the documents are uploaded, fees paid and forms signed, the permit issues automatically, and the inspection is scheduled from the record in Citizen Access.

On September 23, 2026 the City's page said the instant permit was temporarily unavailable because of a business license system upgrade, and that all permits had to be submitted by email to the Permit Center. Revisions already go that way: the City asks for a revised application, updated SolarAPP+ approval documents and a new inspection checklist by email. One inspection fee covers two inspections of the same element; further inspections carry re-inspection fees paid before the final.

What Cupertino's permits and bills look like

Cupertino reported 504 residential solar permits to the Energy Commission for 2024, and 288 of them, about 57%, included battery storage. About 39% were issued online, which reflects how many projects took the instant route rather than regular review.

The bill behind those systems is split. Silicon Valley Clean Energy is the official electricity provider for Cupertino and supplies the generation, while PG&E delivers the power and sends the statement. SVCE says systems applied for after April 14, 2023 are on the Solar Billing Plan, and earlier NEM 2.0 systems keep their terms for 20 years from installation, so a proposal should state which plan it assumes for your home.

What a Cupertino quote needs to explain

A comparison to ask for

Cupertino homes put a battery on more than half of their 2024 solar permits, so expect most bids to include one. Ask each bidder for the battery's usable kWh and backed-up circuits, whether a main service upgrade is part of the same permit, and how many inspections its schedule assumes, since the City's inspection fee covers two visits for the same element and a third costs extra.

Verify the company behind the Cupertino quote

Match the business name and license number on each Cupertino proposal to the CSLB record, then use our contractor verification steps, the quote comparison guide and the PPA, loan, lease and cash comparison.

Permit fees and the filing route are on the Cupertino solar cost and permit page.

Cupertino solar quote questions