Commercial Solar Developers in California: What They Do and How to Vet One

A solar developer turns a site into a project someone will finance. It secures the roof or land rights, the interconnection path, the permits and a buyer for the power, then hires an EPC contractor to build and a long-term owner or investor to hold the system. For a California business, a developer usually arrives offering a power purchase agreement or lease rather than a purchase.

If you are still sorting out who is who, the guide to commercial solar companies and EPCs covers installers and contractors, and the commercial solar hub links every business guide on this site. Sources were checked September 23, 2026.

What a developer does, step by step

1. Site control. A roof lease, a land option or an easement that gives the project the right to use the property for the contract term.
2. Interconnection. For systems serving a customer on PG&E, SCE or SDG&E, the CPUC's Rule 21 sets the interconnection, operating and metering requirements. Projects that sell into the wholesale market use the Wholesale Distribution Access Tariff or the CAISO tariff instead.
3. Permits. Local building, electrical and sometimes land-use approvals. Solar facilities of 50 MW or more can apply to the California Energy Commission's opt-in certification program, which has the CEC decide within 270 days of a complete application.
4. Offtake. A buyer for the power: the business hosting the system under a PPA, a utility, or a community choice aggregator.
5. Financing and tax credits. Debt, equity and the federal credit. The credit can be used by the owner or, under 26 U.S.C. §6418, transferred to an unrelated taxpayer, though not to a specified foreign entity.
6. Construction and operations. An EPC builds the system, and an owner or service provider runs it for the life of the contract.

Developer, EPC, installer, financier: how the roles differ

One company can hold several roles. Get each one named in the contract, and check the construction entity in the CSLB license lookup.

How developers get paid, and why it matters to you

A developer earns from the project: the spread between what a PPA or lease pays and what the project cost, a development fee, the sale of a finished or ready-to-build project to a long-term owner, or the value of the tax credit. None of that is a problem. It becomes one when the contract does not say what happens after the developer sells.

Third-party ownership is common in the segments developers target. LBNL's 2026 data update found third-party ownership roughly twice as common at tax-exempt hosts as at commercial ones in 2025, with the highest rates at “other” tax-exempt sites, many of them houses of worship. Its 2024 Tracking the Sun summary reported the same pattern, particularly for schools and government sites. If you are one of those hosts, see church solar in California and school solar in California, which compare owning with elective pay against a developer's PPA.

The tax-credit clock every developer is working against

Developer proposals written in 2026 are shaped by federal deadlines. Under 26 U.S.C. §48E, a solar facility whose construction began after July 4, 2026 gets no credit for property placed in service after December 31, 2027. Battery storage at the facility is excepted from that cutoff.

Whether a project began construction in time was governed by IRS Notice 2025-42, which required physical work of a significant nature and kept a 5% cost safe harbor only for solar facilities of 1.5 MW AC or less. On June 6, 2026, the U.S. District Court for the District of Columbia vacated that notice in full and sent it back to the IRS in Oregon Environmental Council v. IRS. If a developer tells you your project is grandfathered, ask for its tax counsel's position in writing and have your own tax professional review it.

Sourcing rules also apply. For construction beginning after December 31, 2025, the credit is denied if the facility includes material assistance from a prohibited foreign entity, measured by a cost ratio. Under 26 U.S.C. §7701(a)(52), the threshold for a qualified facility is 40% for construction beginning in 2026 and 45% in 2027. Ask the developer who documents that ratio and who bears the loss if it fails.

Questions to ask a developer offering a PPA or lease

• What is the starting rate, the annual escalator and the total term?
• Who owns the system on day one, and can the contract be assigned without your consent?
• What are the buyout dates and prices, and what happens at the end of the term?
• Who pays for removal and roof repair if the system has to come off for reroofing?
• What production does the rate assume, and is there a performance guarantee?
• Who carries property insurance and property tax on the equipment?

On property tax, California's new-construction exclusion for active solar energy systems in Revenue and Taxation Code section 73 becomes inoperative on January 1, 2027; systems excluded before then stay excluded until the property changes ownership, according to the Board of Equalization's Letter to Assessors 2026/034. Ask the developer how its model treats a system finished on or after that date.

Then compare the offer against ownership on the same production model, using PPA versus purchase for California businesses and the commercial installed-cost benchmarks.

Commercial solar PPA providers: who offers them and how to vet one

A PPA provider owns the system on your property and sells you its output per kilowatt-hour. The provider is usually a developer, an independent power producer or a financing partner of the installer, and the company that sells you the PPA is not always the one that will own it after construction.

PPAs are the main third-party structure for California business solar. In CRR's count of the CPUC's DGStats interconnection data, 420 of the 751 third-party-owned non-residential systems connected by PG&E, SCE and SDG&E in 2025 were PPAs, with a median size of 121 kW DC, and PPAs were about 86% of third-party-owned capacity. At schools, nonprofits and public agencies the share was higher still: 116 of 124 third-party-owned systems.

There is a tax reason for that. Under 26 U.S.C. §7701(e)(3), a contract to sell you electricity from a solar facility is treated as a service contract rather than a lease unless you operate the facility, bear a significant financial burden if it underperforms, get a significant financial benefit if its operating costs come in under the contract standards, or hold an option to buy it at a fixed price other than fair market value. That is the background to how a PPA's buyout price is defined, so read that clause closely and have your own adviser review it.

To vet a provider, get these in writing:

• Operating systems it owns today, with contacts at host sites you can call.
• Who will own and finance your system at completion, and whether that financing is committed.
• Who monitors and repairs the system, the response times, and what you are owed if it is down.
• The rate, escalator, term, any minimum purchase and the production estimate behind the price.
• The buyout schedule and method, assignment rights, and what happens if the provider sells the project or fails.
• Removal and roof-restoration duties at the end of the term.

If you are weighing a lease instead, see commercial solar lease programs, and for the credit the provider is pricing in, the commercial solar tax credit guide.

Utility-scale and community solar developers

Developers building power plants rather than on-site systems work in a different market. Their projects interconnect to the transmission or wholesale distribution system rather than under Rule 21, sell power to utilities or community choice aggregators, and at 50 MW or more can seek CEC opt-in certification. If a landowner is being approached about leasing land for a project, those are the terms to research, not the commercial rooftop terms on this page.

When working with a developer is the wrong fit

If your business has the tax appetite to use the credit and depreciation and the cash or credit to buy the system, owning it directly usually keeps more of the value. A developer PPA is also a poor fit if you may sell the building, move or reroof within the contract term without a clear buyout or relocation clause. The commercial financing guide sets out the alternatives.

Frequently asked questions

California Rate Relief is a referral service. We are not a licensed contractor. It does not develop, own or finance solar projects, and nothing on this page is tax advice.

Sources

Checked September 23, 2026.

• CPUC, Electric Rule 21
• California Energy Commission, Opt-In Certification Program
• LBNL, U.S. Distributed Solar and Storage: 2026 Data Update (August 2026) and Tracking the Sun 2024 executive summary (August 2024)
• 26 U.S.C. §48E, §6418 and §7701, Office of the Law Revision Counsel (text in effect September 22, 2026; §7701(e) re-read September 23, 2026)
• California Public Utilities Commission, DGStats Interconnected Applications Data Set (data through May 31, 2026); CRR count of 2025 non-residential PV systems
• IRS, Notice 2025-42; U.S. District Court for the District of Columbia, Oregon Environmental Council v. IRS, No. 25-cv-4400 (June 6, 2026)
• California State Board of Equalization, Letter to Assessors 2026/034 (September 1, 2026)
• CSLB, license lookup