Top commercial solar installers in California, ranked by ChatGPT answers

Best commercial solar installers in California ==============================================

For a commercial solar project in California, I’d prioritize installers with proven experience in large rooftop systems, industrial facilities, carports, battery storage, and projects that can navigate California’s utility interconnection requirements.

The best choice depends on whether you're powering a warehouse, manufacturing plant, office building, agricultural operation, or a portfolio of properties. I'd also distinguish between a true engineering, procurement, and construction (EPC) contractor that delivers a complete project and a solar developer that finances, owns, or operates the system.

Here are the companies I would put on an initial shortlist for a commercial solar project, based on their market presence and areas of specialization. This is a shortlist to vet, not a definitive ranking of current installer quality.

My top commercial solar installer shortlist

1. Solar Technologies

Best all-around shortlist candidate

Statewide California coverage

A strong starting point for businesses, warehouses, schools, healthcare facilities, and public agencies. Offers commercial solar and battery storage with project development, engineering, installation, commissioning, and ongoing maintenance. The company reports more than 1,000 commercial renewable-energy installations.

Solar Technologies

+1

Website: [solartechnologies.com](https://solartechnologies.com/)

2.

TENCO SOLAR

-------------------

Anaheim · Commercial and public-sector EPC

Particularly worth considering for commercial rooftops, solar carports, battery storage, new construction, and public works projects. TENCO says it has about 30 years of industry experience and more than 40 MW installed. It appeared on Solar Power World's 2026 California contractor list with approximately 11.1 MW installed in the state during 2025.

TENCO SOLAR

+2

Website: [tencosolar.net](https://www.tencosolar.net/)

3. Summit Energy

Large commercial and agricultural projects

A candidate for larger ground-mounted systems, agribusiness, irrigation districts, and solar-plus-storage projects. Its stated capabilities include engineering, procurement, construction management, commissioning, and utility-scale development support.

Summitenergy

Website: [summitenergyinc.com](https://www.summitenergyinc.com/)

4. Renewable America Services

Community-scale solar and storage

A good candidate to evaluate for projects combining solar generation, battery storage, and grid integration. The company reports experience delivering community-scale projects throughout California and offers engineering through commissioning and ongoing maintenance. Its reported 2025 California installations also earned it a place among the state's larger contractors.

Renewable America Services

+1

Website: [rna-s.com](https://www.rna-s.com/)

5. Option One Solar

Southern California · Commercial and industrial

Worth including for warehouses, distribution facilities, retail centers, agricultural properties, and multi-site portfolios. Its commercial offering includes rooftop arrays, carports, ground-mounted solar, and storage under an integrated EPC model.

Option One Solar

Website: [optiononesolar.com/commercial-solar](https://optiononesolar.com/commercial-solar)

6. SWT Energy

California-wide commercial projects

Another bidder to consider if your project needs rooftop solar, parking canopies, battery storage, or EV charging. SWT emphasizes utility interconnection, project financial modeling, and long-term operations and maintenance.

swtus.com

Website: [swtus.com](https://www.swtus.com/)

Which installer is best for your project?

| Project type

|

Companies I'd contact first

Warehouse or industrial rooftop

|

Solar Technologies, TENCO SOLAR

|

|

Large ground-mounted or agricultural solar

|

Summit Energy, Renewable America Services

|

|

Solar carports and parking structures

|

TENCO SOLAR, Option One Solar

|

|

Solar plus battery storage

|

Solar Technologies, SWT Energy

|

|

Multi-site commercial property portfolio

|

Solar Technologies, Option One Solar

|

|

Community-scale solar and storage

|

Renewable America Services

|

These are project-fit recommendations based on advertised capabilities and available industry information, not a verified head-to-head assessment of installation quality or pricing.

How to choose a reliable commercial installer

Before signing a contract, I recommend evaluating each bidder against these six criteria.

• Commercial references: Ask for three completed projects similar to yours in size and building type. Ideally, speak with customers whose systems have operated for at least two years.
• California contractor license: Verify the actual contracting entity and its active license through the [Contractors State License Board](https://www.cslb.ca.gov/) . Relevant classifications can include C-46, C-10, and B, depending on the work.
  California Public Utilities Commission
  +1
• Engineering capability: Require structural roof assessments, electrical studies, and a clear interconnection plan.
• Financial assumptions: Compare modeled savings using your actual utility tariff and interval consumption data, not generic savings estimates.
• Contract and warranty: Establish responsibility for workmanship, equipment, roof leaks, production shortfalls, insurance, and ongoing maintenance.
• Financing options: Compare outright purchase, commercial loans, leases, and power purchase agreements (PPAs), where available. Compare total costs and contract terms, not just the initial payment.

Let me narrow this down to the best three

The most useful next step is to match the shortlist to your project rather than choose solely by company size.

Tell me a little about your project. Partial answers are fine.

1. Where is the project?

Southern California

Bay Area / Northern California

Central Valley

Anywhere in California

1. What kind of property?

Warehouse or industrial rooftop

Office, retail, or multifamily

Solar carport or parking structure

Agricultural or ground-mounted solar

Multiple properties or a portfolio

1. Approximate system size

Under 100 kW

100–500 kW

500 kW–2 MW

Over 2 MW

Not sure yet

1. Preferred financing

Cash purchase

Commercial loan

PPA or lease with little or no upfront cost

Open to either

Find my top three installers

For warehouses and manufacturing facilities in California, I’d prioritize commercial solar EPC contractors (engineering, procurement and construction) rather than companies focused primarily on residential solar. The best partners can handle large rooftop arrays, structural and electrical engineering, utility interconnection, battery storage, and long-term maintenance without disrupting facility operations.

Based on their published commercial portfolios, industrial capabilities, and project-delivery models, these are the companies I would put on a shortlist. This is a practical shortlist, not a definitive ranking based on independently audited customer outcomes.

Best commercial solar installers to evaluate

1. Solar Technologies

Best all-around starting point

A strong first call for large warehouses, manufacturing plants, and multi-site commercial portfolios. Offers integrated design, engineering, construction, battery storage, and ongoing operations and maintenance. The company reports more than 1,000 commercial installations across California.

Solar Technologies

Best for: turnkey projects where you want one contractor accountable from design through long-term service.

[Website](https://solartechnologies.com/)

2.

Coldwell Energy

-----------------------

Best for industrial and agricultural loads

A Northern California-based commercial EPC worth evaluating for manufacturers, food-processing operations, and facilities with multiple meters or buildings. Its published project examples include a 356 kW commercial rooftop system and a 2 MW multi-property solar project.

google.com

Best for: Central Valley and Northern California facilities, especially larger or multi-site energy projects.

[Website](https://www.coldwellenergy.com/)

3. Option One Solar

A compelling Southern California candidate for warehouse rooftops, distribution centers, and commercial properties combining rooftop solar with parking canopies. It advertises in-house engineering and construction, turnkey permitting and interconnection, and California C-10 and C-46 contractor licensing.

Option One Solar

Best for: Owners seeking a single point of responsibility for rooftop and carport installations.

[Website](https://optiononesolar.com/commercial-solar)

4.

TENCO SOLAR

-------------------

An established commercial-focused California contractor with design-build capabilities, maintenance services, and experience coordinating solar with California building-code requirements. It reports more than 40 MW of installed solar and offers a 10-year workmanship warranty.

TENCO SOLAR

Best for: Commercial rooftop retrofits, new construction, and projects needing coordinated electrical and permitting work.

[Website](https://www.tencosolar.net/)

5. CEI Solar

Worth considering for industrial rooftops where you want specific completed-project examples to review. Its published portfolio includes a 364.9 kW rooftop system at a Carson logistics and distribution facility and a 311.5 kW commercial rooftop system in Buena Park, with monitoring and maintenance services.

CEI Solar

Best for: Medium-to-large warehouse projects where relevant local installations and ongoing performance monitoring matter.

[Website](https://www.cei-solar.com/our-cases)

6. General Energy Corporation

Particularly relevant for energy-intensive manufacturing. Its offering emphasizes licensed professional engineering, structural analysis, electrical integration, solar-plus-storage design, and monitoring. The company states that it has completed more than 900 projects across commercial, industrial, and institutional markets and is licensed in California.

GEC

Best for: Factories with high demand charges, complex electrical infrastructure, or a need to evaluate battery storage alongside solar.

[Website](https://www.generalenergycorp.com/epc-services)

7. Panel the Planet

A commercial solar developer and EPC option that works with an installation-partner network. It reports 88+ MW delivered across 138+ projects, including work for logistics, industrial, and manufacturing clients. It also offers solar development, financing options, and owner-side project support.

Artesia, CA

Best for: Owners comparing direct-purchase projects with financed or power-purchase-agreement structures.

[Website](https://www.paneltheplanet.com/)

Which companies fit your facility best?

| Your project

|

Start with

Large warehouse or distribution center

|

Solar Technologies, Option One Solar, CEI Solar

|

|

Manufacturing plant with high electricity demand

|

Solar Technologies, General Energy Corporation

|

|

Central Valley or Northern California industrial site

|

Coldwell Energy

|

|

Southern California rooftop retrofit

|

Option One Solar, TENCO SOLAR

|

|

Solar plus battery storage

|

Solar Technologies, General Energy Corporation

|

|

Comparing financing or a power purchase agreement (PPA)

|

Panel the Planet

|

These are suggested starting points based on each company's published capabilities, not proof that one will offer the lowest price or best project performance.

What separates a good industrial installer from an average one?

Before awarding a contract, I would require each finalist to demonstrate five things:

• Relevant project references: At least two completed facilities comparable in size, roof type, and electrical demand to yours.
• Roof and structural expertise: Structural-load assessment, roof-condition review, waterproofing details, and coordination with the roofing contractor.
• Electrical and utility capability: Experience with your utility, switchgear capacity, interconnection approvals, and the facility's actual load profile.
• Credible financial modeling: Hourly or interval-based energy analysis, realistic self-consumption assumptions, demand-charge treatment, and sensitivity to utility-rate changes.
• Long-term accountability: Clear workmanship and equipment warranties, system monitoring, maintenance response times, and defined responsibility for subcontractors.

For California projects, verify the actual contracting entity and its applicable license classifications through the [California Contractors State License Board](https://www.cslb.ca.gov/) . Also have your tax adviser verify the incentives and deadlines applicable to your project before relying on a quoted return.

Let’s narrow this to the best three bidders

The strongest shortlist depends heavily on where the facility is, how much electricity it uses, and whether you own the building.

1\. Where in California is the facility?

Southern California (LA, Inland Empire, Orange County, San Diego)

Bay Area / Northern California

Central Valley (Fresno, Bakersfield, surrounding areas)

Multiple locations statewide

2\. What kind of facility is it?

Warehouse / distribution center

Manufacturing plant

Refrigerated warehouse / food processing

Mixed industrial campus

3\. Approximate building size

Under 50,000 sq ft

50,000–100,000 sq ft

100,000–300,000 sq ft

Over 300,000 sq ft

4\. Preferred project structure

Purchase the system outright

PPA or third-party ownership with little upfront capital

Compare both options

5\. Battery storage

Solar only

Evaluate batteries to reduce demand charges

Backup power and operational resilience

Find my best three installers

With those details, I can narrow the field to three strong candidates and help you prepare a comparable bid request so you can evaluate proposals on actual economics rather than sales promises.

For commercial solar plus battery storage in California, I would start with installers that have demonstrated commercial and industrial (C&I) project experience, battery integration capabilities, and the ability to handle utility interconnection and ongoing system service.

The best choice depends on whether you're powering a warehouse, manufacturing facility, office building, school, agricultural operation, or a portfolio of properties. A contractor experienced in utility-scale solar farms isn't automatically the best fit for a commercial rooftop or behind-the-meter battery system.

My shortlist below emphasizes companies with documented commercial installation activity and a relevant solar-plus-storage track record. Solar Power World's 2026 contractor rankings are based on installations completed in 2025, while its storage rankings measure storage deployed in 2024, so these are useful indicators of scale—not a definitive quality ranking.

Solar Power World

+1

Best commercial solar-plus-battery installers to evaluate

1. Teichert Solar

Strong C&I track record

Best for large commercial sites, solar carports, ground-mounted arrays and projects requiring substantial construction capabilities.

• Why it stands out: Its 2026 contractor profile reports 114,429 kW installed in 2025, primarily in the commercial and industrial market. Its published capabilities include utility-scale energy storage.
  Solar Power World
• Ask about: Whether it will act as the prime contractor for your battery system or subcontract the storage integration.

Website: [Teichert renewable energy](https://teichert.com/build/renewable-energy/)

2. Baker Electric

Strong integrated solution

Best for businesses seeking solar, battery storage, demand-charge reduction and potentially microgrid capabilities under one project team.

• Why it stands out: Baker explicitly offers commercial energy storage and solar, with experience across industrial, healthcare, education, manufacturing and other commercial sectors. It serves Southern California.
  Baker Electric
  +1
• Ask about: Battery controls, demand-charge savings guarantees, and long-term operations and maintenance.

Website: [Baker Electric Commercial Solar](https://www.baker-electric.com/what-we-do/Commercial-Solar)

3. Motive Energy

Best for industrial and energy-intensive businesses evaluating integrated energy infrastructure.

• Why it stands out: Motive Energy appears in Solar Power World's commercial contractor and solar-plus-storage rankings. Its 2025 storage ranking records 4,550 kWh of storage installations in 2024.
  Solar Power World
  +1
• Ask about: References for batteries installed alongside solar at facilities with similar electrical loads, tariffs and operating hours.

Website: [Motive Energy](https://www.motiveenergy.com/)

4. Sun Light & Power

Best for a commercial property owner looking for a California-based solar EPC to evaluate a building-specific project.

• Why it stands out: The company appears in Solar Power World's California contractor rankings and has documented commercial-market activity. Its 2025 storage listing reports 1,105.6 kWh installed in 2024.
  Solar Power World
  +1
• Ask about: Recent comparable battery projects, supported battery platforms and whether its service team handles the entire system after commissioning.

Website: [Sun Light & Power](https://sunlightandpower.com/)

5. SOLV Energy

Best for very large projects, ground-mounted solar, and utility-scale or large-capacity storage—not necessarily a typical small commercial rooftop.

• Why it stands out: SOLV Energy ranked among the largest U.S. solar-plus-storage contractors in Solar Power World's 2025 list, reporting 2,584,000 kWh of storage installations in 2024.
  Solar Power World
• Ask about: Minimum project size, behind-the-meter experience, and whether it accepts standalone commercial and industrial customer projects.

Website: [SOLV Energy](https://solvenergy.com/)

These are a practical shortlist, not a verified ranking of customer satisfaction. Published installation volumes don't establish workmanship, price competitiveness or warranty performance.

Which companies fit which project?

| Your project

|

Where I'd start

Warehouse or industrial facility

|

Teichert Solar, Baker Electric

|

|

Commercial property with high demand charges

|

Baker Electric, Motive Energy

|

|

Solar carport or large ground-mounted system

|

Teichert Solar

|

|

Commercial rooftop with battery storage

|

Baker Electric, Sun Light & Power

|

|

Very large site or utility-scale project

|

SOLV Energy, Teichert Solar

|

What matters most when choosing an installer

For a commercial solar-plus-storage project, I would compare these five items before selecting a winner:

• Battery economics: A model using your actual 15-minute or hourly electricity data, demand charges and utility tariff—not just estimated annual solar production.
• Battery power and capacity: Both kW (how much power it can deliver) and kWh (how long it can deliver it). These address different needs.
• Controls and backup: Whether the system can reduce peak demand, shift solar energy into evening hours, participate in eligible utility programs, or provide backup power during outages.
• Contract and service: Equipment warranties, workmanship coverage, response times, battery augmentation, monitoring and long-term maintenance responsibilities.
• Financial structure: Compare cash purchase, commercial financing, leases and power purchase agreements where available. Have the installer substantiate any tax benefits or incentives against current eligibility rules.

California's [official Distributed Generation Statistics installer search](https://www.californiadgstats.ca.gov/find_installer/)  is also useful for checking recent solar and storage interconnection projects and reported costs in a specific area. Its records cover recent projects in PG&E, SCE and SDG&E territories, though the data are self-reported and not independently verified.

California DG Stats

Let me narrow this to the best three for your project

The most useful next step is to identify the type and location of the facility. What part of California is the project in, and what kind of property is it? For example, a warehouse in the Inland Empire, a manufacturing plant in the Bay Area, or a multi-building commercial portfolio in San Diego. That will help distinguish the right local EPCs from contractors focused on much larger projects.

For commercial solar in California, I would prioritize installers that offer contractual operations and maintenance (O&M), proactive performance monitoring, in-house electrical service, and guaranteed response times—not just a monitoring app or a standard equipment warranty.

The strongest candidates depend on whether you're installing a new commercial system or hiring someone to maintain an existing one. Based on published service offerings, project experience, and the specificity of their maintenance commitments, these are the companies I'd put on a shortlist. This is a practical shortlist, not an independently verified ranking of customer satisfaction.

Best commercial solar companies to shortlist

1. Cannon Solar

Best documented service commitments

Cannon combines commercial installation with 24/7 monitoring through its CANOS platform, automatic service ticketing, and service-level agreements (SLAs). It publishes specific response and repair targets, including a critical-service tier with four-hour response and next-business-day onsite service. Confirm that these terms apply to your California commercial project.

Cannon Solar

+1

Best for: Owners who want measurable response commitments and a single service provider.

[Commercial solar and O&M](https://www.cannonsolar.com/commercial)  · [Service levels](https://www.cannonsolar.com/Service)

2. TENCO SOLAR

Best for hands-on preventive maintenance

TENCO offers scheduled inspections, electrical testing, thermal imaging, racking and roof-attachment checks, panel cleaning, troubleshooting, and service for systems installed by other contractors. It reports more than 40 MW of installation experience and statewide California service.

TENCO SOLAR

+1

Best for: Commercial rooftops where physical inspections and catching faults before they cause downtime are priorities.

[Commercial maintenance and O&M](https://www.tencosolar.net/commercial/solar-maintenance)

3. Solar Technologies

Best for an established installation partner

Solar Technologies reports more than 1,000 commercial projects and offers integrated design, construction, commissioning, monitoring, preventive maintenance, troubleshooting, and long-term performance optimization. Its full-time service team is a plus if you prefer to keep installation and ongoing support with one contractor.

Solar Technologies

Best for: Businesses planning a new commercial rooftop, carport, ground-mount, or solar-plus-storage project.

[Commercial solar services](https://solartechnologies.com/)

4. RCH Renewables

Best for responsive field service and multi-site portfolios

RCH uses its own electrical crews and advertises monthly performance reporting, priority dispatch, and a named account contact. Its published standard is critical-fault response within one business day and standard service within 3–5 business days. Its case study describes ongoing maintenance across a 59-property retail portfolio.

RCH Renewables

+2

Best for: Retail, healthcare, and other businesses that need real technicians to diagnose and repair issues—not just remote alerts.

[Commercial solar O&M](https://rchrenewables.com/commercial-solar-om)

5. Xero Solar

Best for long-term asset management

Xero Solar's commercial offering includes performance monitoring, alert notifications, inverter service, warranty administration, and annual asset reviews. It also describes KPI reporting for institutional owners and handover documentation for facility and asset managers.

Xero Solar

Best for: Commercial property owners and institutional clients who want performance reporting alongside maintenance.

[Commercial solar services](https://xerosolar.com/services/commercial/)

What about companies that specialize in maintenance?

If you already have solar installed, it can be better to hire a dedicated O&M contractor rather than limit yourself to the original installer.

• SolRx Energy — Offers 24/7 electronic monitoring, alert triage, preventive and corrective maintenance, warranty administration, and performance reporting for commercial systems up to 3+ MW. [Website](https://www.solrxenergy.com/)
  SolRx Energy, Inc
• TerraSun Energy — Provides preventive maintenance, corrective repairs, central-inverter support, monitoring, and performance improvement across California's Central Valley and Central Coast. [O&M services](https://terrasunenergy.com/services/commercial-solar-operations-maintenance)
  TerraSun
• ElectriCare — A good candidate for multi-site owners seeking defined response windows, written service reports, and portfolio-level maintenance. It also services systems installed by other contractors. [Commercial O&M](https://www.electricare.com/commercial-om/)
  ElectriCare

How to tell which installer really has the best after-sales support

I would ask each company for its written O&M agreement and compare these six items before signing.

| What to compare

|

What I would look for

Monitoring

|

24/7 monitoring with automatic alerts and active fault follow-up

|

|

Response time

|

Defined SLA for acknowledgement, technician dispatch, and onsite arrival

|

|

Preventive maintenance

|

Scheduled inspections, thermal imaging, electrical checks, and cleaning where appropriate

|

|

Repair costs

|

Clear distinction between included labor, parts, travel, and billable repairs

|

|

Performance reporting

|

Actual versus expected production, downtime, open faults, and corrective actions

|

|

Warranty administration

|

One accountable team coordinating equipment manufacturers and workmanship claims

|

My recommendation: Start with Cannon Solar if contractual service levels and continuous monitoring are your biggest priorities; TENCO SOLAR if physical maintenance and inspections matter most; and Solar Technologies if you want a single established partner for a new installation and long-term support. These are based on published service scope, not a verified head-to-head test of actual service quality.

One important caveat: a 25-year equipment warranty does not automatically mean 25 years of free monitoring, labor, or repairs. Get the exact O&M coverage, exclusions, and response commitments in writing.

I can narrow this down to the best fit for your project

Which part of California is your property in, and approximately how large is the system?

1\. Project location

Southern California

Bay Area

Central Valley / Central Coast

Sacramento / Northern California

Multiple locations statewide

2\. Project type

New installation

Existing system needing maintenance

Existing system with performance problems

3\. Approximate system size

Under 100 kW

100–250 kW

250 kW–1 MW

Over 1 MW

Multiple sites / not sure

4\. Most important service priority

24/7 monitoring and fault detection

Fast repair response

Preventive maintenance and inspections

Long-term warranty and performance guarantees

Find the best-fit providers

For commercial solar in Southern California, I’d prioritize installers with a proven track record on large commercial rooftops, industrial facilities, parking-canopy systems, and projects that integrate battery storage—not just companies that primarily install residential solar.

The most reliable installer is not necessarily the one with the lowest bid. For a commercial project, I would evaluate financial stability, comparable projects, engineering and permitting expertise, workmanship warranties, long-term service capacity, and the ability to handle utility interconnection with Southern California Edison, SDG&E, or LADWP.

Here’s how I’d build a shortlist and vet the strongest candidates.

My shortlist of commercial solar installers

I found several Southern California contractors worth evaluating. I would separate them by project type because a company that excels at a 100-kW warehouse rooftop may not be the right choice for a multi-megawatt industrial campus.

1.

TENCO SOLAR

-------------------

Anaheim and Riverside · Commercial EPC

A strong candidate for businesses seeking an integrated provider for commercial solar design, installation, battery storage, and ongoing operations and maintenance. Its focus on commercial projects makes it particularly relevant to industrial and multifacility owners.

Best for: Commercial rooftops, industrial facilities, solar plus storage, and ongoing maintenance.

Local business listing: 4.4/5 from 22 reviews. This is a limited review sample, not a commercial-project reliability score.

+1 714-844-1063

Verify current CSLB license, insurance, references, and service commitments before contracting.

2.

Baker Commercial Solar

------------------------------

Escondido · Commercial and industrial construction

Offers full engineering, procurement, and construction (EPC) capabilities, including rooftop, ground-mounted, and solar-canopy projects. Its connection to Baker Electric is relevant when the job also requires substantial electrical construction.

Best for: Industrial properties, parking canopies, larger electrical upgrades, and design-build projects.

Commercial project fit is more informative here than consumer review scores; request references for comparable completed projects.

+1 760-708-9658

3.

G C Electric Solar

--------------------------

Escondido · Solar and electrical integration

An option to consider for solar projects that combine PV, battery storage, EV charging, and associated electrical work. Its local presence and service capabilities are useful considerations for owners who want support after commissioning.

Best for: Small-to-mid-sized commercial installations, storage integration, and projects requiring electrical upgrades.

Local business listing: 4.4/5 from 81 reviews. Ask specifically for references from commercial customers, not just residential clients.

+1 858-999-3929

4.

SunTech Energy

----------------------

Beverly Hills · Commercial EPC

Markets end-to-end commercial and industrial solar, including rooftop systems, solar carports, energy storage, and EV charging infrastructure.

Best for: Commercial property owners looking for an integrated solar and electrification solution.

Local business listing: 5.0/5 from 54 reviews. Confirm how many reviews and references relate to projects comparable to yours.

+1 888-600-0798

5.

RA Power & Light

------------------------

Laguna Beach · Commercial and industrial EPC

Focuses on commercial and industrial distributed energy projects, including rooftop solar and parking canopies with potential EV charging integration. It is worth including in a competitive bid for a technically demanding property.

Best for: Industrial retrofits, solar carports, and custom commercial installations.

Public review evidence is sparse, so give greater weight to verifiable project references, engineering credentials, and financial qualifications.

6.

SOLV Energy

-------------------

San Diego · Large-scale renewable energy EPC

Formerly known as Swinerton Renewable Energy, SOLV Energy is oriented toward large-scale energy infrastructure, including solar, battery storage, grid interconnection, and long-term operations and maintenance.

Best for: Utility-scale solar, large energy portfolios, and projects involving complex high-voltage interconnection.

Important: For a typical commercial rooftop, this may be more contractor than you need. For a large ground-mounted project, it merits consideration.

These are a project-fit shortlist, not a definitive ranking of reliability. The business listings and published service descriptions provide useful starting points, but they do not independently establish comparative commercial failure rates, warranty claim performance, or financial strength.

Where these contractors are located

Commercial solar contractors in Southern California

Reset viewExpand map

Map data is currently unavailable

TENCO SOLARBaker Commercial SolarG C Electric SolarSunTech EnergyRA POWER & LIGHT LLCSwinerton Renewable Energy

How I would verify reliability before signing

For a commercial solar project, I would require the following from every finalist.

| What to verify

|

What I would ask for

Comparable experience

|

Three completed projects of similar size and complexity, preferably operating for at least two years.

|

|

Licensing and insurance

|

Active California CSLB license matching the contracting entity and required classifications; verify insurance and workers' compensation.

|

|

Workmanship warranty

|

Written duration, exclusions, roof-penetration coverage, leak responsibility, and labor costs for repairs.

|

|

Production guarantee

|

Guaranteed annual energy production, degradation assumptions, measurement methodology, and remedies for underperformance.

|

|

Financial stability

|

Recent financial statements or equivalent evidence, bonding capacity, and references from lenders or project owners where appropriate.

|

|

Operations and maintenance

|

Monitoring, response times, preventive maintenance, inverter replacement, and service coverage after the installation team leaves.

|

|

Contract accountability

|

Clear responsibility for structural engineering, roof repairs, permits, utility interconnection, commissioning, and change orders.

|

California contractor credentials can be checked through the [Contractors State License Board](https://www.cslb.ca.gov/) . For broader market comparisons, [Solar Power World](https://www.solarpowerworldonline.com/)  publishes industry contractor rankings, although installation volume alone is not proof of reliability.

My recommendation by project type

• Warehouse or industrial rooftop: Start with TENCO SOLAR and Baker Commercial Solar.
• Commercial solar plus batteries or EV charging: Include G C Electric Solar and SunTech Energy.
• Parking canopy or complex industrial retrofit: Include Baker Commercial Solar and RA Power & Light.
• Large ground-mounted or utility-scale project: Evaluate SOLV Energy alongside specialist EPC firms.

I would solicit at least three detailed proposals and compare total lifecycle cost rather than just upfront dollars per watt.

Let me narrow this to the best options for your project

The most useful next step is to identify the size and type of installation you're considering.

1. What type of property is this?

Warehouse or industrial rooftop

Retail, office, or multifamily property

Parking canopy or EV charging site

Ground-mounted or utility-scale project

Multiple commercial properties

1. Approximate system size

Under 100 kW

100–500 kW

500 kW–2 MW

Over 2 MW

Not sure yet

3\. Where is the project?

Los Angeles / Ventura County

Orange County / Inland Empire

San Diego County

Multiple Southern California counties

4\. Do you need battery storage?

Solar only

Solar plus battery storage

Solar, battery, and EV charging

Undecided

5\. What matters most?

Reliability and long-term service

Lowest installed cost

Strongest financial and production guarantees

Financing or power purchase agreement (PPA)

Find the best-fit installers

With those details, I can narrow the list to the most appropriate commercial EPC contractors instead of mixing small-installation specialists with large-project developers.

Best commercial solar installers in Northern California =======================================================

For a commercial solar project in Northern California, I'd start with established EPC contractors (engineering, procurement, and construction) that can handle system design, permitting, utility interconnection, installation, and long-term operations—not just sell solar panels.

The best fit depends on whether you're installing solar on a warehouse, manufacturing facility, office building, agricultural property, or a large ground-mounted site. Project size, utility territory (PG&E, SMUD, or another provider), and whether you want a battery system can significantly change the shortlist.

My shortlist: 8 commercial solar companies to evaluate

These are a practical shortlist based on commercial project capabilities, Northern California coverage, and available company information—not a definitive independent ranking. I'd prioritize the first five for a commercial project.

1. TENCO SOLAR

Strong all-around candidate

Best for commercial rooftops, solar carports, schools, industrial buildings, and multifamily properties. The company advertises turnkey EPC services, in-house design and installation, and experience with SMUD and PG&E utility territories.

TENCO SOLAR Official

Sacramento region · [Website](https://www.tencosolar.net/service-area/sacramento-ca)

2. Citadel Roofing & Solar

Best for projects where roof condition and solar installation need to be coordinated. Its advertised capabilities include commercial rooftop systems, ground mounts, solar carports, and solar-plus-storage. The combined roofing and solar approach is particularly useful when a roof replacement is approaching.

MarketMediaNews

Vacaville and broader California coverage · [Website](https://www.citadelsolar.com/)

3. Sun Light & Power

Best for Bay Area commercial buildings and organizations seeking experienced engineering and long-term system support. The company offers commercial solar and has experience with solar thermal systems as well as photovoltaic installations.

Sun Light & Power

+1

Berkeley / Bay Area · [Website](https://www.sunlightandpower.com/)

4.

CitiGreen, Inc.

-----------------------

Best for commercial property owners looking for a full-project partner. Its advertised services cover feasibility, financial modeling, design, permitting, utility approvals, construction, monitoring, and maintenance. Worth considering for projects in PG&E territory.

google.com

Auburn · [Website](https://www.citigreeninc.com/)

5.

Coldwell Energy

-----------------------

Best for businesses looking beyond solar panels to include battery storage, EV charging, and broader energy improvements. Its commercial focus makes it worth including when evaluating an integrated energy project.

google.com

Rocklin · [Website](https://www.coldwellenergy.com/)

6\. Scudder Solar Energy Systems

Best for agricultural, institutional, educational, and commercial properties along the Central Coast and in nearby Northern California markets. Offers commercial solar design, engineering, and installation.

Scudder Solar

Marina / Central Coast · [Website](https://www.scuddersolar.com/commercial)

7\. Energy Saving Pros

Best for smaller and midsize commercial projects, including schools, nonprofits, and facilities in the Sacramento region. It advertises Northern California service coverage and experience with educational and community organizations.

Energy Saving Pros

+1

Greater Sacramento · [Website](https://energysavingpros.com/)

8.

Collins Electrical Company, Inc.

----------------------------------------

Best for projects with substantial electrical construction requirements, larger renewable installations, or complex infrastructure. Its West Sacramento operation handles commercial renewable energy work, and the company also advertises solar maintenance and related electrical services.

google.com

West Sacramento · [Website](https://www.collinselectric.com/)

Compare their locations

Selected Northern California commercial solar contractors

Reset viewExpand map

Map data is currently unavailable

CitiGreen, Inc.Coldwell EnergyCollins Electrical Company, Inc.

The map shows three of the shortlist's Sacramento-area companies. The other companies serve different parts of Northern California, so service coverage should be confirmed for your specific site.

How I'd choose the winner

For a serious commercial project, I'd request at least three competing proposals and evaluate these five areas:

| Evaluation criterion

|

What to require

Commercial track record

|

Three completed projects similar in size and building type

|

|

Financial performance

|

Annual production forecast, utility-bill savings, payback, and sensitivity analysis

|

|

Engineering

|

Structural review, roof warranty coordination, electrical upgrades, and interconnection

|

|

Contract and warranties

|

Workmanship, equipment, production assumptions, exclusions, and service response times

|

|

Financial structure

|

Cash purchase versus lease or PPA, including ownership and tax-benefit assumptions

|

Important: Ask each bidder to confirm its current California contractor license and relevant classifications through the Contractors State License Board. Also, have your tax adviser verify incentive eligibility under the rules applicable to your project and construction timeline rather than relying on a sales presentation.

Let me narrow this to the best 3 for your project

The most useful detail is what type of commercial property are you looking to solarize?

1\. Project location

San Francisco Bay Area

Sacramento / Central Valley

North Coast / Redding

Monterey / Central Coast

Multiple sites across Northern California

2\. Property type

Warehouse or industrial facility

Office, retail, or multifamily

Agricultural property or farm

Ground-mounted commercial solar

School, government, or nonprofit

3\. Approximate system size

Under 100 kW

100–250 kW

250 kW–1 MW

Over 1 MW

Not sure yet

4\. Energy solution

Solar only

Solar + battery

Solar with no upfront capital (PPA/lease)

Open to options

Find my top 3 installers

With those details, I can focus on the companies most likely to handle your project well rather than simply listing general solar installers.

For commercial solar projects in California, I would prioritize companies that can offer a competitive power purchase agreement (PPA), a true equipment lease, and a credible direct-purchase alternative—not just the installer advertising the lowest monthly payment.

The best option depends on whether you're installing solar on a warehouse, manufacturing facility, retail center, agricultural property, office building, or multifamily portfolio, and whether you own the property.

A PPA generally means no upfront equipment cost: the provider owns and maintains the system, and your business buys the electricity it produces. A lease typically has a fixed payment, while a PPA charges per kilowatt-hour. Both can transfer much of the equipment performance and maintenance risk to the provider.

California Public Utilities Commission

+1

My shortlist: commercial solar installers and financing providers

These are the companies I would invite to bid first. This is a practical shortlist based on their published commercial capabilities and financing structures, not an independently verified ranking of contract prices or customer satisfaction.

1. Revel Energy

Best overall financing flexibility

California commercial and industrial projects

Revel offers PPAs, lease-to-own financing, traditional bank financing, shared-savings structures and C-PACE options. Its PPA model is designed for businesses seeking solar with little or no upfront capital, with the provider handling system ownership and maintenance.

Revel Energy

+2

Best for: Manufacturers, warehouses, agricultural facilities and commercial property owners comparing several ways to finance the same project.

[Official financing options](https://revel-energy.com/commercial-solar-financing-options/)

2. Baker Electric

Strong Southern California EPC and project delivery

Baker offers turnkey commercial solar, battery storage, microgrids, engineering, construction and financial guidance. Its experience spans industrial, healthcare, education, hospitality and multifacility portfolios. It is particularly worth soliciting when construction quality, system integration and project execution matter as much as financing.

Renewable and Energy Storage Solutions

+1

Best for: Larger facilities, complex rooftops, solar carports and solar-plus-storage projects.

Ask for: A written PPA or lease quote alongside a financed-purchase proposal; verify which third-party financing partners are available for your project.

[Official commercial solar services](https://www.baker-electric.com/what-we-do/Commercial-Solar)

3. Plankton Energy

Best to evaluate for third-party ownership

Plankton develops, finances, installs and operates commercial solar projects. Its published offerings include 15–25-year PPAs, site leases for rooftops and parking areas, and direct-purchase projects.

Solar Installation

+1

Best for: Property owners who want no-capital-cost solar, or owners of large roofs and parking lots who want to monetize unused space.

Important distinction: A site lease pays the property owner for hosting a solar installation; a solar PPA lets the property owner buy electricity from the system. These are different transactions.

[Official financing options](https://planktonenergy.com/financing/)

4. Solar Earth Inc.

Worth comparing for lease-to-own options

Solar Earth advertises commercial financing through lease-to-own arrangements, PPAs, financed purchases and cash purchases. It also advertises long-term production guarantees. These are company-published offerings, so have the precise warranty, exclusions and ownership-transfer terms confirmed in writing.

Solar Earth Inc

Best for: Small and midsize commercial properties that want to compare a zero-down path with eventual ownership.

[Official commercial financing page](https://solarearthinc.com/commercial-solar-financing/)

5. Sunwealth

Best additional financing bid for qualifying projects

Sunwealth provides project financing through PPAs, site leases and operating leases for commercial projects above 25 kW DC. It works with installation and development partners, so confirm whether your preferred local installer can work with its financing program.

Sunwealth®

+1

Best for: Nonprofits, schools, commercial property owners and developers looking for third-party capital.

[Official financing program](https://www.sunwealth.com/for-developers)

Which financing option is actually best?

| Financing structure

|

Main advantage

|

Main drawback

PPA

|

Low or no upfront cost; pay for solar electricity

|

Long contract, escalators and possible buyout restrictions

|

|

Operating lease

|

Predictable scheduled payments

|

Payments may be due even when production underperforms

|

|

Lease-to-own

|

Low initial capital requirement with a path to ownership

|

Buyout price and transfer terms can change the economics

|

|

Cash or solar loan

|

More control and potentially greater long-term savings

|

Requires capital or debt capacity; owner assumes more responsibility

|

|

C-PACE

|

Can finance eligible project costs over a long term

|

Property-tax assessment, underwriting and sale/refinancing implications

|

The CPUC's consumer guide explains the key PPA-versus-lease distinction, including how escalation clauses and contract transfers can affect costs.

California Public Utilities Commission

+1

My recommendation is to get three comparable bids: Revel Energy, Baker Electric and either Plankton Energy or a financing provider such as Sunwealth. For the same system size, production estimate and battery configuration, compare total payments over the full contract, not just the advertised first-year savings.

What to negotiate before signing

• PPA rate: Initial price per kWh, annual escalator and projected savings under conservative utility-rate assumptions.
• Lease payment: Fixed or escalating payment, term, residual value and purchase option.
• Performance guarantee: Annual production commitment, remedies for shortfalls, and responsibility for inverter or equipment failure.
• Roof obligations: Who pays for panel removal and reinstallation if the roof needs replacement.
• End-of-term terms: Renewal, removal, fair-market-value buyout, transfer upon property sale and lender consent.
• Battery economics: Whether storage actually reduces demand charges and peak-period purchases, rather than simply increasing project size.

One additional consideration: California's commercial solar economics and federal incentives are changing in 2026. Do not assume a particular tax credit or depreciation benefit applies without having the installer and your tax adviser verify eligibility for your project and construction timeline.

Let me narrow this to the best three for your project

The right shortlist changes considerably with project size and location. Which kind of commercial property are you looking to install solar on?

1. Property type

Warehouse / industrial

Retail, office or multifamily

Agricultural or cold storage

School, nonprofit or public facility

Multiple properties / portfolio

1. California region

Southern California

Bay Area

Central Valley

Sacramento / Northern California

Statewide / multiple regions

1. Average monthly electricity bill

Under $5,000

$5,000–$20,000

$20,000–$100,000

Over $100,000

Not sure yet

1. Primary objective

Lowest total electricity cost

Zero upfront cost

Fixed payments and predictable budgeting

Eventual ownership

Earn income from roof or parking space

1. Property ownership

I own the property

I lease the property

I manage properties for an owner

Find my best three options

If I were evaluating commercial solar installers in California, I’d prioritize locally owned or family-run companies with a track record of completed commercial projects, strong references from business owners, in-house project management, and service support after installation.

That last point matters: a commercial solar system is a long-term business asset. You want an installer that will still be available to help with monitoring, inverter failures, roof leaks, warranty claims, and system performance years after commissioning.

California is a large market, so the best shortlist depends on where your property is located and whether you need rooftop solar, a ground-mounted system, battery storage, or a combination.

California commercial solar companies worth shortlisting

These are the companies I’d investigate first based on local or family ownership, commercial capabilities, customer feedback, and evidence of actual business installations. This is a research-based shortlist, not a claim that every company has been independently vetted or that all have equally strong commercial references.

1. Pickett Solar

Strong commercial fit

Fresno · Central Valley

A second-generation, family-owned business founded in 1988, with in-house architectural design, drafting, and civil engineering. Its site includes testimonials from commercial and agricultural customers, including Bee Sweet Citrus, Minturn Huller Cooperative, and Palm Bluff Veterinary Hospital.

Pickett Solar

+1

Best for: Agricultural facilities, commercial rooftops, and more complex projects requiring engineering and construction coordination.

[Official website](https://pickettsolar.com/)

2. TENCO SOLAR

Strong commercial fit

Anaheim and Riverside · Statewide commercial work

Family-owned and operated for more than three decades, according to the company. It offers commercial design-build services and works with public-sector facilities, multifamily housing, hospitality, and industrial properties.

TENCO SOLAR

+1

Best for: Businesses seeking a commercial engineering, procurement, and construction (EPC) partner, particularly for larger or more complex projects.

[Official website](https://www.tencosolar.net/)

3.

Solar Source

--------------------

Long Beach · Southern California

A family-owned contractor with commercial and residential services, including ongoing system support. Its commercial project examples include medical offices, churches, car washes, wineries, laundromats, and office buildings.

yelp.com

Best for: Small and midsize businesses that value a local contractor and access to repair and maintenance services.

[Find company information](https://www.google.com/search?q=Solar+Source+Long+Beach+California+commercial+solar)

4.

Air Sun Solar

---------------------

Visalia · Central Valley

A locally owned contractor advertising commercial, industrial, agricultural, and public-sector work. Its capabilities include rooftop systems, solar carports, ground mounts, trackers, batteries, and maintenance.

yelp.com

Best for: Farms, warehouses, industrial properties, and businesses with available land or parking areas.

[Find company information](https://www.google.com/search?q=Air+Sun+Solar+Visalia+commercial+solar)

5.

APG Solar

-----------------

Atwater · Central California

A family-owned solar and backup-power contractor offering commercial installations, electrical work, troubleshooting, and repairs. Its service capabilities make it worth considering when support after commissioning is a priority.

yelp.com

Best for: Central Valley businesses seeking solar with electrical integration, backup power, or ongoing service.

[Find company information](https://www.google.com/search?q=APG+Solar+Atwater+California)

6.

Solar Installation Group (SIG Solar)

--------------------------------------------

Oakdale · Northern California and Central Valley

A family-owned contractor serving residential, commercial, and agricultural customers. It advertises commercial system design and installation, with purchase, loan, and power-purchase agreement (PPA) options.

yelp.com

Best for: Businesses comparing different financing structures as well as installation bids.

[Find company information](https://www.google.com/search?q=Solar+Installation+Group+SIG+Solar+Oakdale)

Which companies have the strongest evidence of business-owner trust?

I would start by separating evidence of customer satisfaction from evidence of commercial competence.

| Company

|

Most compelling evidence to investigate

Pickett Solar

|

Second-generation local ownership and named commercial customer testimonials.

Pickett Solar

+1

|

|

TENCO SOLAR

|

Long operating history and a stated focus on commercial and institutional projects.

TENCO SOLAR

|

|

Solar Source

|

Commercial project diversity and maintenance capabilities.

yelp.com

|

|

Air Sun Solar

|

Broad commercial and agricultural installation capabilities.

yelp.com

|

|

APG Solar

|

Commercial electrical integration, troubleshooting, and repair capabilities.

yelp.com

|

One useful additional signal is a reference from an owner whose system has operated for at least three years. Ask about actual savings, downtime, responsiveness, and whether the installer honored its warranty—not just whether installation day went smoothly.

How I would vet any finalist

Before signing, I’d do these five checks:

1. Verify the contractor's license. Use the [California Contractors State License Board (CSLB)](https://web.cslb.ca.gov/OnlineServices/CheckLicenseII/checklicense.aspx)  to confirm active status, relevant classifications, and available complaint disclosures. The California Public Utilities Commission also recommends checking licensing, experience, and independent reviews.
   CSLB
   +1
2. Ask for three commercial references. Ideally, speak with businesses that have had systems operating for several years.
3. Request actual production data. Compare estimated annual output, degradation assumptions, savings calculations, and any production guarantee.
4. Clarify who does the work. Ask whether the company uses its own crews or subcontractors and who is accountable for roofing, electrical, and permitting issues.
5. Get the service terms in writing. Confirm warranty coverage, monitoring, response times, and who pays for labor on warranty repairs.

Let’s narrow this to the right companies for your project

One question will help me produce a much more useful shortlist: Where in California is the business property located?

1\. Property location

Northern California / Bay Area

Sacramento / Central Valley / Fresno

Los Angeles / Orange County / Inland Empire / San Diego

Another California region

2\. Project type

Commercial rooftop

Ground-mounted / agricultural

Solar carport / parking lot

Solar plus battery storage

3\. Approximate system size

Under 100 kW

100–500 kW

500 kW–1 MW

Over 1 MW

Not sure yet

4\. Your main priority

Trust, references, and after-sales service

Lowest total installed cost

Engineering and large-project experience

Financing or a power-purchase agreement

Find my best-fit installers