The Buyer's Guide
Most pages on this topic are written by lead-generation companies. This one is written by a licensed C-10 electrical contractor that builds commercial solar for a living. Real 2026 cost ranges, the actual tax math, and what to check before you sign anything. We show you the math, not marketing promises.
$2.20-$3.20
Per Watt Installed
30%
Federal Tax Credit
5-8 Yrs
Typical Payback
Commercial solar in Southern California runs $2.20 to $3.20 per watt installed before incentives in 2026. Systems under 100 kW land at the higher end of that range because fixed costs like engineering, permitting, and mobilization spread across fewer watts. Larger systems benefit from scale.
Here is what that range looks like at common commercial sizes. These are illustrative planning figures, straight multiplication of the per-watt range, not quotes:
| System Size | Est. Cost Before Incentives | Est. Net After 30% ITC |
|---|---|---|
| 100 kW | $220,000 - $320,000 | $154,000 - $224,000 |
| 250 kW | $550,000 - $800,000 | $385,000 - $560,000 |
| 500 kW | $1,100,000 - $1,600,000 | $770,000 - $1,120,000 |
| 1 MW | $2,200,000 - $3,200,000 | $1,540,000 - $2,240,000 |
What moves a project within the range: roof condition and racking type, the state of your electrical infrastructure (older switchgear sometimes needs upgrades before interconnection), whether prevailing wage applies, and how much trenching or structural work the site needs. Getting the prevailing wage question right matters: avoiding AB 2143 triggers can save 10-15% on qualifying projects.
For the full breakdown of what drives commercial solar pricing, read our 2026 California commercial solar cost guide.
Enter your average monthly bill and utility to see a planning-level estimate of system size, installed cost, the federal tax credit, and payback. Industry ROI estimates often miss by 20-30% because they use generic assumptions, so treat any calculator, including this one, as a starting point rather than an answer.
Planning Tool
Rough numbers in 30 seconds. Clear numbers when you talk to us.
Est. System Size
Enter your bill
Est. Installed Cost
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Federal ITC (30%)
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Est. Simple Payback
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Assumptions
Installed cost of $2.20-$3.20 per watt before incentives (typical 2026 Southern California commercial range; systems under 100 kW usually land at the higher end). Federal ITC at the 30% baseline; bonus adders can raise the credit for qualifying projects. Simple payback of 5-8 years, the typical range for well-designed California commercial systems using the ITC and MACRS depreciation. Bill-to-size conversion uses illustrative blended rates of $0.30/kWh (SCE), $0.34/kWh (SDG&E), $0.22/kWh (LADWP), and $0.18/kWh (municipal), estimated production of 1,450-1,600 kWh per kW per year in Southern California, and a system sized to offset roughly 80-100% of annual usage. Your rate schedule, roof, and load profile will move these numbers.
This is a planning estimate, not a quote.
Free ROI analysis based on your actual bills and rate schedule. Response within 24 hours.
The Incentive Stack
Two federal mechanisms do most of the heavy lifting in business solar economics. Together they are why well-designed California commercial systems typically pay back in 5 to 8 years.
The federal ITC returns 30% of the total system cost as a tax credit, and commercial entities can claim it through the end of 2027. Systems under 1 MW get the full 30% without labor requirements. Over 1 MW, prevailing wage and apprenticeship requirements apply to claim the full credit. Bonus adders exist for qualifying projects, which is where 30-50% figures come from, and equipment sourcing must satisfy FEOC requirements for the credit to hold up.
Because a solar system is business equipment, you depreciate it on an accelerated schedule under MACRS. That front-loads deductions into the early years of ownership and stacks a second layer of tax benefit on top of the credit. The combined effect is what compresses payback into the 5-8 year range. Your CPA models the exact figures for your entity; we supply the system numbers they need.
One more piece of context: California's NEM 3.0 Net Billing Tariff reduced what utilities pay for exported power. That did not kill commercial solar economics; it changed the design job. Systems sized so production is consumed on-site during operating hours preserve their returns, and batteries became more compelling as a financial tool, not just backup.
The right structure depends on your tax appetite, your capital plans, and how long you intend to hold the building. There is no universally correct answer, which is why anyone pushing a single option at every business should make you cautious.
You own the asset, claim the 30% ITC and MACRS depreciation directly, and keep every dollar of savings after payback. Best lifetime economics for businesses with the tax liability to absorb the credit and the capital to deploy.
Best for: profitable operators planning to hold the property.
A Power Purchase Agreement puts a system on your roof for $0 upfront. You buy the power it produces at a fixed rate with an escalator typically around 2-3% per year, against utility increases that have historically run 5-6%. The provider owns and maintains the system.
Best for: nonprofits, low tax appetite, or capital committed elsewhere.
A loan splits the difference: you keep ownership and the tax benefits while preserving working capital. When energy savings exceed the loan payment, the system is cash-flow positive from early in its life. We work with financing partners to match structures to project economics.
Best for: owners who want the tax benefits without the upfront check.
For a detailed side-by-side, read PPA vs. purchase for California businesses.
A commercial solar system is a 30-year electrical asset. The company that builds it matters more than the panels on the datasheet. Five checks before you sign:
Commercial solar is electrical construction. In California that means a C-10 Electrical Contractor license. Look the number up on the CSLB license check, and confirm bonding and insurance while you are there. Keen Energy is CSLB #1137888, licensed, bonded, and insured.
Ask who physically installs the system. Sales organizations that broker projects to subcontractors add markup and lose quality control. In-house C-10 electrical crews with state-certified Journeymen and Apprentices mean the company that signed your contract is the one on your roof.
One company responsible for design, equipment, permitting, utility interconnection, and commissioning means one warranty and no finger-pointing. Here is how the EPC model works and why it is the standard for commercial projects.
Industry ROI estimates often miss by 20-30% because they use generic assumptions instead of your rate schedule and load profile. Ask any bidder to show their production model, their rate assumptions, and their NEM 3.0 treatment. If they cannot walk you through the math, that is your answer.
Tier-1 equipment carries 25-year manufacturer warranties, but warranties only pay off if someone is monitoring production and maintaining the system. Ask what operations and maintenance looks like after commissioning, and who answers the phone when output drops.
The best candidates share two traits: heavy daytime electricity use and exposure to demand charges, which make up 30-70% of many commercial bills. If that sounds like your operation, the economics deserve a serious look.
Big flat roofs and daytime operations make warehouses the classic commercial solar fit. See our guide to solar for warehouses.
HVAC, lighting, and refrigeration running through open hours line up with solar production. See retail solar solutions.
High industrial loads and demand charges. We built a 793 kW rooftop system for a La Verne plastics manufacturer. See manufacturing solar.
Lot lighting, service bays, and growing EV charging loads. Read our guide to solar for car dealerships.
We also work with cold storage, agriculture, multifamily housing, offices, hospitality, data centers, nonprofits, and places of worship. The full list and project examples live on our commercial solar page and in our project portfolio.
Keen Energy is headquartered in Riverside County and installs across Riverside, Orange, Los Angeles, San Diego, and San Bernardino counties, working in SCE, SDG&E, LADWP, IID, and Anaheim Public Utilities territories. Each utility has its own interconnection process, and we manage all of them.
Send us a recent bill and we will model your system from your actual usage and rate schedule. No cost. No obligation. Just clear numbers on what solar can do for your business.
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