Top commercial solar installers in California, ranked by ChatGPT answers

Places ChatGPT showed

• Pickett Solar · Solar energy system service
• CitiGreen, Inc. · 4.6★ · Solar energy company
• California Builders - Solar Contractor · 5.0★ · Solar energy system service
• Addy Solar & Electric · 4.9★ · Solar energy company
• Coldwell Energy · 4.4★ · Solar Installation
• California Solar Electric Cooperative · 4.6★ · Solar energy company

If you mean commercial/industrial solar (C&I) rather than residential, I’d build the shortlist differently. There isn’t one objective “best” installer; project size, utility territory, roof/carport/ground-mount design, storage, and financing can change the right choice.

Based on 2025 California installation volume reported in Solar Power World’s 2026 contractor data, plus companies’ commercial EPC capabilities, these are worth putting on an RFP list:

• Pickett Solar — Particularly relevant for Central Valley commercial, agricultural, industrial and public-sector projects. Solar Power World reports about 20.9 MW installed in California in 2025, with C&I as its market.
• Solar Technologies — A dedicated California commercial EPC handling design, engineering, construction, storage and O&M. It says it has delivered 1,000+ commercial renewable-energy installations and has 28+ years of solar experience.
• Teichert Solar — A major California commercial contractor; Solar Power World reports roughly 106 MW installed in California in 2025, and industry analysis identifies it as the leading commercial contractor in the 2026 C&I ranking.
• Helix Electric — Commercial/industrial EPC with about 53.3 MW installed in California in 2025 according to Solar Power World.
• Tenco Solar — Commercial EPC specializing in rooftop, carport and battery-storage projects across California; about 11.1 MW installed in California in 2025.
• Coldwell Energy — Rocklin-based contractor focused on commercial, industrial and agribusiness projects, including rooftop, ground-mount and carport systems; about 24.2 MW reported in California for 2025.
• BPi — Napa-based commercial solar EPC with electrical and roofing capabilities, useful for commercial real-estate portfolios and more complicated building projects.
• Renewable America Services — California commercial/community-scale EPC offering solar + storage, engineering through construction, commissioning and CAISO integration.
• Summit Energy — Worth considering for large commercial, agricultural, irrigation/water-district and utility-scale installations, particularly when storage is part of the project.

If you're in Northern California

For a smaller or mid-sized project around Chico / Sacramento / the North State, I'd also look at local contractors rather than automatically choosing a statewide giant:

• CitiGreen, Inc. — Auburn; commercial-focused and serves the PG&E/Northern California market.
• California Builders - Solar Contractor — Chico; custom solar work including light commercial projects.
• Addy Solar & Electric — Redding; commercial, agricultural and electrical/solar work.
• Coldwell Energy — Rocklin; particularly relevant to commercial/industrial/agricultural projects.
• California Solar Electric Cooperative — Grass Valley; commercial, nonprofit and government projects.

What I'd require in the bids

For a commercial project, don't compare bids solely on $/W. Ask each installer for the same scope and compare:

1. System size and expected annual production
2. Battery/storage proposal, if applicable
3. Roof replacement or structural work required before installation
4. Interconnection assumptions and utility study costs
5. Equipment warranties vs. installer workmanship warranty
6. Who actually holds the California contractor license and performs the work
7. O&M/service response terms for 10–25 years
8. Cash purchase vs. loan vs. PPA/lease economics
9. Performance guarantees
10. References for projects similar in size and utility territory

For California commercial work, this distinction is important: an EPC/developer isn't necessarily the same legal entity that performs the physical installation. Verify the actual contracting entity and its California Contractors State License Board status before signing.

If you tell me (a) city, (b) approximate building size or monthly electric bill, and (c) whether it's rooftop, ground-mount, or parking-canopy, I can narrow this to 5–7 installers that are specifically appropriate for your project and compare their commercial experience, licensing, service model, and likely project fit.

Places ChatGPT showed

• Coldwell Energy · 4.8★ · Solar energy company
• TENCO SOLAR · 4.4★ · Solar energy company
• Baker Commercial Solar · Solar energy company
• BPi - Solar Energy Contractor · 5.0★ · Solar energy system service
• Pickett Solar · Solar energy system service
• Sustineo Solar · 4.0★ · Solar energy company

For California warehouses and manufacturing facilities, I’d focus on commercial/industrial EPC contractors rather than residential solar companies. The important capabilities are structural engineering, large-rooftop PV, medium-voltage electrical work, utility interconnection, battery storage, demand-charge management, and long-term O&M.

Based on current company information and the California commercial market, these are worth putting on an RFP list:

Company	Particularly relevant for	Coverage / notes
Coldwell Energy	Industrial, manufacturing, agribusiness	Rocklin-based commercial/industrial EPC; rooftop, ground-mount and carport systems.
TENCO SOLAR	Large commercial/industrial projects	California-wide commercial EPC, including rooftop, carport, storage and complex public/industrial work.
Baker Commercial Solar	Large industrial/manufacturing facilities	Full EPC capability with experience across industrial/manufacturing and larger-scale projects.
BPi - Solar Energy Contractor	Manufacturing + roofing-intensive projects	Napa-based commercial EPC with electrical and roofing capabilities, useful where roof condition/warranty is a major issue.
Pickett Solar	Central Valley warehouses, food/ag processing	Particularly relevant to Central Valley industrial, agricultural, food-processing and warehouse facilities.
Sustineo Solar	Industrial projects needing engineering + O&M	San Diego-based EPC with commercial/industrial rooftop, carport and ongoing asset-management capabilities.

A few particularly interesting candidates

Solar Technologies is worth a serious look for a statewide project. It says it has completed 1,000+ commercial installations, 150+ MW, and specifically lists manufacturing, industrial facilities, warehouses and distribution centers. It also offers BESS and long-term O&M under an integrated EPC model.

General Energy Corporation is another candidate I'd include for a manufacturing plant. It emphasizes engineering by licensed P.E.s, industrial electrical integration, structural analysis and BESS, and reports 200+ solar projects and 500+ C&I clients.

For Southern California warehouses, Option One Solar is also interesting because it explicitly operates as an in-house EPC, handles design through interconnection, and specifically discusses warehouses/distribution facilities and large-scale projects.

What I'd require in the RFP

For a warehouse or factory, don't select based primarily on $/W. Ask every bidder to provide:

Based on current company information and the California commercial market, these are worth putting on an RFP list:

Company	Particularly relevant for	Coverage / notes
Coldwell Energy	Industrial, manufacturing, agribusiness	Rocklin-based commercial/industrial EPC; rooftop, ground-mount and carport systems.
TENCO SOLAR	Large commercial/industrial projects	California-wide commercial EPC, including rooftop, carport, storage and complex public/industrial work.
Baker Commercial Solar	Large industrial/manufacturing facilities	Full EPC capability with experience across industrial/manufacturing and larger-scale projects.
BPi - Solar Energy Contractor	Manufacturing + roofing-intensive projects	Napa-based commercial EPC with electrical and roofing capabilities, useful where roof condition/warranty is a major issue.
Pickett Solar	Central Valley warehouses, food/ag processing	Particularly relevant to Central Valley industrial, agricultural, food-processing and warehouse facilities.
Sustineo Solar	Industrial projects needing engineering + O&M	San Diego-based EPC with commercial/industrial rooftop, carport and ongoing asset-management capabilities.

• 12–24 months of interval utility data and a tariff/demand-charge analysis.
• Structural analysis of the existing roof, including remaining roof life and warranty implications.
• Proposed DC/AC system size, annual production and degradation assumptions.
• Electrical one-line showing the point of interconnection and any required transformer/switchgear upgrades.
• Battery-storage option with explicit demand-charge savings and operating strategy.
• Utility interconnection assumptions and a schedule through PTO.
• Cash purchase, loan, PPA and/or lease economics where applicable.
• Detailed equipment manufacturers and warranties.
• Production/performance guarantee and liquidated damages, if offered.
• O&M pricing and response-time commitments for 10–25 years.
• Evidence of comparable projects—ideally 500 kW–5 MW warehouses or manufacturing plants rather than residential/commercial jobs.
• California contractor license number and the actual legal entity signing the contract. A company marketing itself as an EPC isn't necessarily the licensed entity doing the physical work.

One especially important point in 2026 is to have the proposals model the current federal incentive rules and deadlines, rather than letting a salesperson simply assume a generic "30% ITC." The timing and eligibility rules have changed materially.

If you tell me (1) approximate warehouse/manufacturing square footage, (2) city/county, (3) utility—PG&E, SCE, SDG&E, etc., and (4) roughly how much you spend on electricity per month, I can narrow this to 3–5 installers that fit the project, including relevant project experience and what I would ask each one to bid.

Places ChatGPT showed

• Baker Commercial Solar · Solar energy company

For commercial solar + battery storage in California, I’d build a shortlist around firms with demonstrated C&I EPC experience and actual storage capabilities—not just residential installers that also sell batteries.

California commercial installers worth getting bids from

• Baker Commercial Solar — Escondido/Southern California. Commercial/industrial solar, BESS and microgrids, with an integrated engineering/construction model. Baker installed about 231 MW in California in 2025 according to Solar Power World.
• Coldwell Energy — Rocklin/Northern California. Commercial-focused EPC offering solar, battery storage and EV charging; particularly relevant for industrial/agricultural facilities. Solar Power World lists it as a California C&I EPC.
• TENCO SOLAR — Anaheim/Southern California. Full-service C&I EPC with rooftop, carport and battery-storage capabilities. It specifically markets statewide commercial EPC work.
• Sandbar Solar & Electric — Santa Cruz/Central Coast. Offers commercial rooftop, ground-mount and carport solar plus storage, including microgrid/public-sector work.
• BPi — Napa. Commercial-focused EPC with solar, storage, carports, EV charging, roofing coordination and O&M. Solar Power World lists BPi as a California C&I EPC.
• Solar Technologies — statewide coverage. Its commercial practice includes end-to-end EPC for solar and BESS, including engineering, procurement, permitting, interconnection and long-term service; it reports 150+ MW installed.
• Renewable America Services — statewide. California-licensed EPC focused on commercial/community-scale solar + storage, with in-house engineering, construction, commissioning and CAISO integration. It reports 20+ MW solar and 10+ MWh storage completed.
• New Era Electric — San Marcos/Southern California. Particularly interesting if the project is electrically complicated: it has commercial solar/electrical expertise and a documented 250 kW / 496 kWh solar-plus-storage project.

How I'd narrow the bids

For a serious commercial project, I'd ask 3–5 companies to quote exactly the same scope and compare:

1. Battery sizing and economics — not simply “X kWh of batteries.” Require modeling of demand charges, TOU arbitrage, solar clipping, export value and backup requirements.
2. Peak-demand reduction — ask for the modeled monthly demand-charge savings and the control strategy used to achieve them.
3. Utility/interconnection experience — PG&E, SCE, SDG&E, SMUD, etc., depending on the site.
4. Battery manufacturer and warranty — including cycle/throughput limits, degradation assumptions and who handles warranty claims.
5. Backup/microgrid capability — especially if you need the facility to operate during outages rather than merely reduce the electric bill.
6. 20–25 year financial model — including replacement/augmentation of batteries, O&M, inverter replacement, utility-rate assumptions and degradation.
7. Who actually performs the work — EPC employees versus subcontractors.
8. California licensing and references. The CSLB specifically recommends getting competing bids and checking contractor licenses and references.

One particularly important California consideration is building-code compliance for BESS: the California Energy Commission maintains certification requirements for battery systems under JA12, and certain nonresidential buildings can have prescriptive battery-storage requirements.

If you tell me the city, approximate building size/electric bill, utility (PG&E/SCE/SDG&E/etc.), and whether this is rooftop, ground-mount or carport, I can narrow this to a 5-company bid list and compare their commercial solar + battery capabilities, geographic coverage, financing options, and track record.

Places ChatGPT showed

• TENCO SOLAR · 4.4★ · Solar energy company
• Terrasun Energy Services · Solar energy company
• Sunup Solar Tech Services · 5.0★ · Solar energy system service
• Coldwell Energy · 4.8★ · Solar energy company
• Sun Light & Power Solar · 3.5★ · Solar energy system service
• HES Renewables · 5.0★ · Solar energy company
• Photovoltaics California · Solar energy system service
• BPi - Solar Energy Contractor · 5.0★ · Solar energy system service

For commercial solar in California, I’d focus less on installer size and more on whether the company has a real O&M operation: 24/7 monitoring, proactive fault detection, defined response times, preventive inspections, performance reporting, and the ability to repair equipment rather than simply dispatching you back to the original installer.

Based on current California offerings, these are worth putting on an RFP list:

• TENCO SOLAR — Strong integrated EPC + O&M option. They install and maintain commercial systems, offer annual/semiannual inspections, thermal imaging, electrical testing, repairs and monitoring, and report more than 40 MW of California installation experience. Their “single point of accountability” model is particularly relevant if you want the installer to remain responsible after commissioning.
• Terrasun Energy Services — Strong dedicated O&M choice for Central Valley/Central Coast. They specialize in commercial/agricultural O&M rather than treating maintenance as an afterthought, with 24/7 monitoring, preventive maintenance, corrective repairs, performance testing and asset management. They report servicing more than 200 MW.
• Sunup Solar Tech Services — Good fit for larger or technically complex assets. SunUp is focused specifically on commercial solar O&M and lifecycle services, including commissioning, inspections, diagnostics and performance optimization, rather than primarily residential installation.
• Coldwell Energy — Worth considering for Northern/Central California commercial projects. It is a commercial/industrial/agribusiness EPC with ongoing monitoring and lifecycle support, including rooftop, ground-mount and carport projects.
• Sun Light & Power Solar — Interesting Bay Area/Northern California option. It offers commercial installation plus ongoing monitoring, inspections, preventive maintenance, cleaning and repair, including service for systems installed by other contractors.
• HES Renewables — Southern California option. It handles commercial installations as well as diagnostics, repairs, monitoring upgrades and O&M agreements for existing systems.
• Photovoltaics California — O&M specialist rather than a conventional sales-driven installer. Particularly relevant for commercial/utility PV owners and portfolios needing diagnostics, electrical O&M and ongoing asset support.
• BPi - Solar Energy Contractor — Good EPC-plus-lifecycle model. Its commercial offering includes ongoing monitoring, scheduled reporting and predictive maintenance planning.

What I'd put in the RFP

For a commercial system, I'd require each bidder to specify these in writing:

Requirement	What to ask for
Monitoring	24/7 monitoring, automatic inverter/production alarms
Response	Guaranteed response time for critical faults
Preventive maintenance	Annual or semiannual inspections
Performance	Monthly/quarterly production and performance-ratio reports
Diagnostics	Thermography, IV-curve testing and root-cause analysis
Repairs	Whether technicians actually perform inverter/electrical repairs
Warranty	Who manages manufacturer and workmanship warranty claims
Staffing	In-house technicians vs. subcontractors
Coverage	Geographic limits and maximum travel time
Reporting	Named account manager + documented service tickets
Contract	Clear inclusions/exclusions and emergency-service pricing

One particularly important distinction is monitoring versus actual performance management. A dashboard showing that an inverter is online isn't enough. Companies such as RCH Renewables describe comparing actual production against modeled output and investigating underperformance, while TerraSun describes performance testing and return-to-service verification. That's closer to the level of O&M I'd want for a revenue-producing commercial asset.

If you tell me where in California, system size (e.g. 250 kW, 1 MW, 5 MW), rooftop vs. ground-mount, and whether you're looking for a new installation or O&M for an existing system, I can narrow this to a short list of 3–5 companies and compare their monitoring, response times, service territory, licensing, and commercial track record.

Places ChatGPT showed

• Tenco Solar Inc. · 5.0★ · Corporate office
• Sungreen Systems Inc · 5.0★ · Solar energy system service
• HES Renewables · 5.0★ · Solar energy company
• Baker Commercial Solar · Solar energy company
• REP Solar · 4.4★ · Solar energy company
• Sunterra Solar Inc · 5.0★ · Solar energy system service
• SunTech Energy · 5.0★ · Solar Installation
• TENCO SOLAR · 4.4★ · Solar energy company

If you mean commercial/industrial solar (C&I) rather than residential installers that occasionally do small businesses, I’d put the following Southern California firms on a serious RFP shortlist. I’m using current local-business data plus California solar-industry guidance—not simply online star ratings.

Commercial installers worth interviewing

• Tenco Solar Inc. — Riverside / statewide CA. A dedicated EPC contractor with an emphasis on commercial projects, including larger systems and solar carports. This is one I’d investigate for a substantial commercial installation rather than a small rooftop job.
• Sungreen Systems Inc — Pasadena / Southern California. Particularly focused on commercial and industrial renewable-energy projects, with capabilities extending to EV charging and broader electrification.
• HES Renewables — San Diego / SoCal. Commercial-scale specialist with experience in rooftop PV, carports, more complicated metering arrangements, and O&M/repair of existing systems.
• Baker Commercial Solar — Escondido / SoCal. The commercial/industrial arm of Baker Electric's renewable-energy business. Worth considering for larger or structurally complicated projects, including projects involving GCs, steel, canopies and multi-tenant facilities.
• REP Solar — Corona / Inland Empire. Commercial and institutional focus, with PV, battery storage, EV charging and commercial financing/PPA structures. It also advertises ongoing commercial O&M.
• Sunterra Solar Inc — San Diego / statewide. Commercial contractor with a particularly relevant portfolio for businesses, public agencies, nonprofits and contractors bidding solar scopes. Its capabilities include rooftop, carport, ground-mount and system-recommissioning work.
• SunTech Energy — Los Angeles / SoCal. Offers commercial rooftop PV, carports, storage and EV charging, with an EPC-oriented model and broad Southern California coverage.
• TENCO SOLAR — Anaheim / Riverside. Commercial EPC and carport capabilities; its Southern California presence makes it convenient for Orange County/Inland Empire projects.

How I'd vet them

For a commercial project, "reliable" shouldn't mean simply having a high Google rating. California's CPUC specifically recommends verifying the contractor's active CSLB license, checking how long it has been operating and how many installations it has completed, checking multiple review sources, and looking for NABCEP-certified personnel.

I'd ask every bidder for:

1. CSLB license number and classification — verify it directly with CSLB.
2. Three comparable commercial references completed at least 1–3 years ago.
3. Actual installed MW/kW of commercial projects, not residential volume.
4. Whether engineering, electrical work and installation are in-house or subcontracted.
5. Production guarantee, equipment warranties and workmanship warranty.
6. A detailed O&M agreement and response-time commitment.
7. Their experience with your particular utility—SCE, SDG&E or LADWP—and interconnection.
8. For a larger project, their financial capacity and bonding/insurance.
9. At least three competing bids using identical assumptions about panels, inverters, batteries, roof work, interconnection and O&M.

CALSSA membership is another useful screening signal: its members include solar designers, installers, financiers and other industry businesses, and members agree to a code of ethics.

One important distinction: if you tell me the city, approximate system size (e.g. 100 kW, 500 kW, 2 MW), property type (warehouse, office, multifamily, manufacturing, etc.), and utility, I can narrow this to 3–5 commercial specialists that actually fit the project, including licensing, commercial project history, reviews and likely fit.

Places ChatGPT showed

• Sun Light & Power Solar · 3.5★ · Solar energy system service
• BPi - Solar Energy Contractor · 5.0★ · Solar energy system service
• Coldwell Energy · 4.8★ · Solar energy company
• Collins Electrical Company, Inc. · 4.8★ · Electrician
• BayWa r.e. Power Solutions Inc. · 4.4★ · Solar energy company
• SUPERIOR SOLAR, INC · 5.0★ · Solar energy company
• Solar Installation Group, Inc. · 4.0★ · Solar energy company
• Sandbar Solar & Electric · 4.6★ · Solar energy company

If you're looking for commercial/industrial solar in Northern California, I’d put these firms on a serious bid list. Rather than treating “best” as a single objective ranking, I’d match the installer to your project type, geography, and system size.

• Sun Light & Power Solar — Berkeley / Bay Area. A particularly established commercial solar contractor: founded in 1976, 3,000+ projects, and experience with warehouses, industrial facilities, offices, hotels, schools and larger systems. Its portfolio includes projects from roughly 400 kW to 900+ kW.
• BPi - Solar Energy Contractor — Napa. Commercial-focused EPC with experience in wineries, agriculture and industrial/manufacturing facilities. Its Napa location makes it particularly relevant for North Bay projects.
• Coldwell Energy — Rocklin / Sacramento region. Commercial, industrial and agricultural EPC with turnkey design/procurement/installation, including rooftop, ground-mount and solar-carport projects.
• Collins Electrical Company, Inc. — West Sacramento. Worth considering for larger or technically complex commercial projects. Its renewables division reports involvement in 450+ PV installations and also handles commercial electrical and EV infrastructure.
• BayWa r.e. Power Solutions Inc. — Sacramento. More oriented toward large C&I, public-sector, community and utility-scale EPC, including solar-plus-storage. I'd consider them when the project is substantially larger than a typical commercial rooftop.
• SUPERIOR SOLAR, INC — Rancho Cordova. Commercial and agricultural solar plus electrical/EV-charging capabilities; potentially a good fit for smaller-to-mid-sized business projects.
• Solar Installation Group, Inc. — Oakdale / Central Valley. Commercial and agricultural projects throughout Northern California, with experience in different financing structures as well as installation.
• Sandbar Solar & Electric — Santa Cruz / Central Coast. Commercial rooftop, carport and ground-mount solar plus storage, EV charging and electrical work.

One I'd definitely interview

SolarCraft is another strong North Bay candidate, particularly for Sonoma, Napa and Marin. The company says it has more than 40 years of commercial/industrial experience and handles development, financing, design/build, permitting, interconnection and maintenance in-house. Its California contractor license is #497797.

SolarCraft

How I'd narrow the field

For a commercial project, don't choose solely on panel price per watt. Get at least 3 competitive proposals and compare:

1. System design: annual kWh production, degradation assumptions, inverter architecture and shading analysis.
2. Storage: whether batteries actually improve your economics through demand-charge management, backup power or rate arbitrage.
3. Interconnection: who handles PG&E/utility studies, permitting and unexpected upgrade costs.
4. Roof responsibility: especially important for a 20–30-year solar asset.
5. Workmanship warranty: separate this from the manufacturer's equipment warranty.
6. O&M: response times, monitoring, inverter replacement and long-term service.
7. Financial model: cash purchase vs. loan vs. PPA, including degradation and utility-rate assumptions.
8. Commercial references: ask for 2–3 customers with projects similar in size and building type.

One useful current data point: Sun Light & Power's California CSLB record is reported as active with B, C-10 and C-46 classifications, and its 2026 Solar Power World ranking reports about 5.96 MW installed in 2025.

If you tell me (a) city, (b) approximate annual electric bill or kWh, (c) rooftop vs. ground-mount, and (d) approximate project size, I can narrow this to 3–5 installers that specifically fit your project and compare their commercial capabilities, licensing, track record and service area.

Worked for 11s

1. Searched 12 websites
2. I’m comparing providers on the financing structures they actually advertise—not just installation capability—and separating true commercial PPA/lease offerings from residential financing.
3. Searching the web
4. Searched 5 websites

Map data is currently unavailable National Energy Installers 3.7Solar InstallationOpen TRITEC AmericasSolar energy equipment supplier Baker Commercial SolarSolar energy companyOpen Supreme Solar & Electric SoCal 5.0Solar energy companyOpen Charge BlissSolar Installation California Solar 5.0Solar energy companyOpen

For a California commercial property, I’d focus less on a generic “best installer” and more on which provider gives you the strongest PPA/lease economics, contract terms, and project financing. Based on current 2026 offerings, these are several providers worth putting into an RFP:

Provider	Financing structures advertised	Particularly relevant for
National Energy Installers	PPA, site lease, cash/financing	C&I buildings, warehouses, manufacturing, retail, schools
TRITEC Americas	Zero-down PPA, cash purchase; long-term O&M	Larger C&I projects and organizations wanting third-party ownership
Baker Commercial Solar	Custom financing / no-upfront-capital structures	Southern California commercial/industrial properties
REP Solar	PPA, lease, debt and other tailored structures	C&I, larger facilities and portfolios
Faraday Microgrids	PPA or equipment lease, including solar + storage	Facilities where resilience/backup power matters
California Solar	Loans, leases and PPAs	Smaller-to-mid-size commercial projects

The two I'd put near the top of an RFP

TRITEC Americas has one of the clearest commercial third-party-ownership offerings I've found. Its PowerNow program has TRITEC develop, finance, own and operate the system, with zero money down and maintenance/monitoring included. It also publishes actual California commercial PPA examples, including a 2.4-MW automotive project in Irvine and 1.15-MW school/church project in San Diego.

National Energy Installers (NEI) is particularly interesting if you want to compare a PPA against a site lease or ownership from the same provider. NEI says it has installed 350+ MW in California and explicitly offers cash/financing, PPAs and site leases for C&I customers.

PPA vs. lease: what I'd compare

For a commercial building, don't simply compare the monthly payment.

PPA

• You pay for the electricity the system produces, typically $/kWh.
• Provider owns the system and generally handles maintenance.
• Little/no upfront capital.
• The crucial numbers are the starting PPA rate, annual escalator, production guarantee, REC ownership and buyout price.

Lease

• You pay a fixed periodic payment for use of the equipment.
• Easier to budget because payment isn't directly tied to production.
• Again, the important items are escalator, maintenance, degradation/production guarantees and end-of-term ownership.

Ownership/loan

• More capital responsibility, but you retain the asset and associated tax benefits if eligible.
• Particularly worth modeling when the business has substantial taxable income.

One major 2026 issue

The federal commercial §48E Clean Electricity Investment Credit is currently a major factor in third-party financing. The IRS says the credit can be up to 30% when prevailing-wage/apprenticeship requirements are met, with additional potential bonuses.

However, 2026 legislation created important restrictions for solar facilities: the IRS says the credit terminates for applicable solar facilities placed in service after December 31, 2027 when construction begins after July 4, 2026.

That makes the financing provider's ability to qualify the project and establish when construction begins particularly important right now. Don't accept a salesperson's statement that your project automatically gets a 30% credit—have the financier document the applicable tax-credit treatment.

What I'd demand in competing proposals

Ask each company to quote the same system under three structures:

1. Cash/loan purchase
2. 25-year PPA
3. 25-year lease

And require these numbers in writing:

• Installed price ($/W)
• System size and expected annual production
• PPA starting $/kWh
• Annual PPA escalator
• Lease payment and escalator
• Year-1 and year-10 projected savings
• Production guarantee
• O&M costs and who pays them
• Battery/storage cost separately
• Buyout price in years 5, 10, 15 and at expiration
• Early termination provisions
• Roof/site lease provisions
• REC ownership
• System removal obligation
• Transfer provisions if you sell the building
• Tax-credit/incentive assumptions
• Interconnection costs
• Performance degradation assumption

The escalator deserves special attention. A PPA advertised at a low starting rate can look excellent while a 2–3% annual escalator materially changes the economics over 20–25 years. Current commercial-market guidance puts typical PPA escalators around 1–3% annually.

If you tell me (1) approximate system size or annual electric bill, (2) utility—PG&E/SCE/SDG&E/other, (3) city, and (4) whether you own the building, I can narrow this to a 3–5 company commercial RFP shortlist and build a PPA-vs-lease comparison model for your property.

Places ChatGPT showed

• TENCO SOLAR · 4.4★ · Solar energy company
• Solar Source · 4.9★ · Solar energy system service
• Solar Installation Group, Inc. · 4.0★ · Solar energy company
• APG Solar · 5.0★ · Solar energy system service
• DC Solar Electric Inc. · 4.4★ · Solar energy company
• California Solar Electric Cooperative · 4.6★ · Solar energy company

Yes. If by “trusted” you mean family/local ownership plus a meaningful track record of customer reviews and commercial work, there are several California installers worth putting on a bid list. I’d avoid treating any review score as proof of quality, though—commercial solar is a long-term contractor relationship, so licensing, financial stability, references, warranty support, and actual commercial-project experience matter too.

California companies I’d investigate

• TENCO SOLAR — Anaheim / Southern California. Family-owned and operated, with more than three decades serving California commercial solar. Their focus is unusually commercial-oriented: rooftop and carport systems, battery storage, public works, multifamily and hospitality.
• Solar Source — Long Beach / Southern California. Family-owned, with both residential and commercial work. Their stated commercial portfolio includes medical offices, wineries, car washes, laundromats, HOAs and office buildings. Solar Source
• Solar Installation Group, Inc. — Oakdale / Central Valley. Family-owned and serves businesses and agricultural customers as well as homeowners. They handle commercial design/build and discuss multiple financing structures. Solar Installation Group, Inc.
• APG Solar — Atwater / Central California. Family-owned and locally based, with residential, commercial and agricultural capabilities plus ongoing service and troubleshooting. Its current business listing shows 5.0/5 from 17 reviews. APG Solar
• DC Solar Electric Inc. — Colfax / Northern California. A second-generation family company doing residential, commercial, agricultural and nonprofit work, with design/build rather than simply acting as a sales intermediary. DC Solar Electric Inc.
• California Solar Electric Cooperative — Grass Valley / Northern California. Not family-owned, but particularly interesting if “locally owned” is the goal: it became a worker-owned cooperative in 2019 and does commercial, nonprofit and government projects. Its current business listing shows 4.6/5 from 17 reviews. California Solar Electric Cooperative
• G C Electric Solar — Southern California. EnergySage identifies it explicitly as family-owned and locally operated, established in 2008, with 4.8/5 from 165 EnergySage reviews and Elite+ status. It also has commercial-adjacent electrical capabilities, including main-panel upgrades and EV charging.
• Michael & Sun Solar — Sonoma County. A local, family-owned installer explicitly serving businesses as well as homes. HomeAdvisor currently shows 5.0/5 from five reviews, although that's a relatively small review sample.

One particularly interesting signal

For a small-business owner, I like looking for evidence that customers were happy after installation, not just during the sales process. First Response Solar in Sonoma County is a good example: its published customer feedback includes accounts of warranty issues being handled years later, owners being involved on job sites, and customers specifically valuing direct access to the owners.

That's the kind of evidence I'd look for with any installer you're considering.

How I'd vet them for a commercial project

Before signing, ask each installer for:

1. Three recent commercial references for projects roughly comparable to yours.
2. A reference whose system has been operating for 3+ years.
3. Their California contractor license and evidence of current insurance/bonding.
4. Who actually performs the electrical and roofing work—employees or subcontractors.
5. The exact workmanship warranty, and who services it if the company changes ownership.
6. Their experience with your utility's interconnection process.
7. A production estimate and the assumptions behind it—not just projected dollar savings.
8. Whether they will provide O&M/monitoring after PTO and what that costs.
9. A line-item proposal separating PV, electrical upgrades, roofing, batteries, structural work, permitting and interconnection.
10. A copy of the proposed contract before asking you for a deposit.

One important distinction: a company can be highly trusted for residential installations without being the right contractor for a $500k+ commercial project. For commercial solar, I'd put considerably more weight on comparable commercial references and financial/operational longevity than on a 5-star consumer rating.

If you tell me where in California the business is, approximate system size (e.g. 100 kW, 500 kW, 1 MW), and the type of property (warehouse, retail, office, farm, multifamily, etc.), I can narrow this to a shortlist of 5–7 genuinely local/family-owned commercial installers and compare their commercial track records, reviews, licensing, service area, and ownership.