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    Commercial Solar in California: Build a Quote You Can Actually Compare

    By Updated 9 sources cited

    MethodologyHow we make moneyEditorial policy

    A commercial solar proposal only works when it starts with the property’s real load, tariff, meters, roof or site, interconnection path and ownership plan. Use this guide to make bidders show the same inputs, costs and responsibilities.

    California Rate Relief is a private solar referral service.

    Before requesting bids, the commercial solar cost page and calculator lets you estimate your after-tax cost, payback and property-value impact.

    Every commercial solar guide on this site

    Start with whichever question is actually blocking the decision. Each page states its sources and the date they were checked.

    By property type and system size

    Related guides on the blog

    Start with the building. Then size the project.

    A round-number system size or generic savings percentage is not a usable proposal. Give every bidder the same property and energy record. Ask each one to explain every gap.

    • At least 12 months of utility bills and, when available, interval and demand data.
    • Current tariff, utility, account type and every meter the project is expected to affect.
    • Operating hours, seasonal loads and planned changes such as EV charging or electrification.
    • Roof age, warranty, structural records, parking or ground area, shade and equipment constraints.
    • Property ownership, lease term, lender or landlord approvals and expected holding period.
    • The actual goal: lower energy purchases, demand management, backup power, code compliance or a combination.

    Make the savings model show its work

    Require monthly production and bill results, not one annual total. The model should identify onsite use, grid imports, exports, export-credit assumptions, demand charges and every remaining utility charge. It should also show degradation, downtime, operating costs and the replacement assumptions carried through the analysis.

    Ask for the first year and every later year in a cash-flow table. If the project uses a utility escalation rate, financing escalator, tax benefit or resale value, make the bidder label it. Run a second case with the uncertain benefits removed.

    California export credits do not equal the retail rate

    The CPUC says new eligible systems in the investor-owned utility territories generally take service under the Net Billing Tariff. Onsite generation first serves onsite load. Excess generation exported to the grid receives time-varying compensation that is usually below the retail rate. That makes the load profile and time of production central to the proposal.

    Municipal utilities have their own tariffs and interconnection rules. Get the named tariff and current utility documents for the project address before accepting any savings result.

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    New construction has a separate Energy Code question

    California's 2025 Energy Code applies to permit applications submitted on or after January 1, 2026. The California Energy Commission explains that specified newly constructed nonresidential buildings can have photovoltaic and battery requirements, subject to building type, calculations and exceptions. The commission also says alterations to existing nonresidential buildings do not trigger the prescriptive PV and battery requirements by themselves.

    Ask the project architect or energy-code professional to identify the applicable section, calculation method, exception and compliance forms. A sales proposal should not be the final code determination.

    Compare ownership and service, not just monthly payment

    StructureQuestions the proposal must answer
    Direct ownershipWho uses the tax benefits, funds replacements, operates the system and carries performance risk?
    LoanWhat are the cash price, fees, rate, term, collateral, total payments and prepayment terms?
    LeaseWho owns, insures, monitors and repairs the equipment, and what happens at sale or lease end?
    Power purchase agreementWhat is the starting energy price, escalator, minimum purchase, performance obligation and end-of-term choice?

    Treat tax benefits as a tax workstream

    The IRS says the Clean Electricity Investment Credit can apply to qualified facilities and energy-storage technology placed in service after 2024. Its current summary lists a 6% base credit, a possible increase up to 30% when labor requirements are met, possible bonus amounts and potential elective-pay or transfer options for eligible parties. Eligibility, credit amount, basis, labor rules, timing and tax ownership depend on the actual project.

    Have a qualified tax adviser confirm the treatment. Require the proposal to show project economics before tax benefits and then show the claimed benefits as a separate case.

    Issue one scope to every bidder

    1. Define the meters, loads, project goals and required completion conditions.
    2. Require the same production-weather source, utility data and analysis period.
    3. Separate solar, storage, roof, structural, electrical, permitting and interconnection costs.
    4. Name the equipment, warranties, monitoring, service response and replacement assumptions.
    5. Identify every exclusion, allowance, change-order trigger and owner responsibility.
    6. Provide a milestone schedule with design, permit, utility, procurement, construction and commissioning dependencies.
    7. State who owns the drawings, data, incentives and equipment at every stage.

    Do the failure review before signing

    Test lower production, delayed interconnection, a roof repair, a rate change, equipment downtime and an early property sale. Ask who pays, what remedy applies and what the contract lets each party do. The strongest proposal is the one whose assumptions and responsibilities remain clear when the easy case does not happen.

    Frequently asked questions

    What does commercial solar maintenance involve in California?

    NREL’s best-practice guide for operation and maintenance divides the work into preventive maintenance on a schedule, corrective repairs when something fails, and condition-based maintenance driven by monitoring data. The routine tasks are performance monitoring, inspections such as thermal imaging of the array and electrical connections, inverter servicing, cleaning when soiling warrants it and, on ground mounts, vegetation control. The guide, from 2018, noted 10-year inverter warranties were common and 20-year extended plans were spreading. Before signing, get in writing who does each task, the response time for a fault, who pays for an inverter replacement and who owns the monitoring data; under a PPA or lease the provider usually carries it, under ownership you do.

    Does SDG&E have a commercial solar program?

    Not a rebate on panels. New business systems in SDG&E territory are interconnected under the CPUC’s net billing rules, with export credits that vary by hour and are usually below the retail rate. SDG&E’s Solar Billing Plan page says the plan is for residential customers and that commercial customers stay on their existing pricing plan, so a business proposal has to model the actual commercial tariff. If San Diego Community Power or another CCA supplies the business, SDG&E says the CCA sets the generation export credit. Battery incentives, where available, come through SGIP’s non-residential budgets; check the tracker’s status for your category before a bid counts on them.

    Is there state funding for agricultural solar in California?

    Not through the Energy Commission’s agricultural program right now. The Renewable Energy for Agriculture Program granted $10 million for renewable energy at farms; its only solicitation opened in January 2019, awards were announced that April, and the Energy Commission says all of the funding was used and it is not accepting applications. Farms use the same tools as other businesses: the federal business credit, subject to the cutoffs the 2025 tax law added for solar, SGIP for storage where budgets are open, and financing such as C-PACE. The agricultural solar guide on this site covers the tariffs and meter questions farms face.

    Put the property and bills in front of a commercial provider

    Tell California Rate Relief about the site, utility, electricity use and project goal. We review the inquiry and may connect a suitable project with an independent provider, subject to service availability.

    10-digit US number, area code first.

    Submitting does not create a quote, approval, or obligation.

    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

    The same form is also on its own page: Request a commercial assessment.