US residential solar · 2026 data

Commercial Solar ROI in 2026: How Businesses Calculate the Return

Est. net savings

$494,000

Over 25 Years (illustrative model) · no federal credit

$239,400 Net after ITC
12% Modeled IRR
200 kW System size

Typical result:

  • **200 kW** example commercial array
  • **$239,400** net cost after 30% ITC ($1.71/W gross)
  • **12%** modeled IRR (**~15%** with 5-year MACRS)
  • **7.6 yr** simple payback at 13.5¢/kWh
✓ EIA rates & NREL sun data ✓ 2026 federal policy applied ✓ Open methodology
· 10 min read ·By
Commercial ROI Calculator View State Rates

25 years without solar vs with solar

Assumes 3%/yr rate increases, 0.5%/yr panel degradation and no federal tax credit (the 30% §25D credit ended for systems installed after Dec 31, 2025). How we calculate

Without solar

25-year utility bills

$858,700

Rates rise ~3% per year

With solar

System cost + remaining bills

$364,400

Installed cost, no federal credit

Difference

Estimated 25-year net

+$494,300

Before any state or utility incentives

Numbers on this page are built from public data

EIA electricity rates NREL PVWatts DSIRE incentives IRS Our methodology
Author Green Energy Calculators Editorial Team
Editorial policy No paid placements
Last updated
Data approach EIA rates · NREL sun hours · 2026 federal policy · methodology

A commercial solar project pays back through avoided electricity purchases, federal tax benefits, and sometimes state or utility incentives. For a typical 200 kW system priced near the $1.71 per watt commercial benchmark, the 30% federal Investment Tax Credit (ITC) brings net cost to about $239,000, and modeled simple payback lands near 7.6 years at the current national average commercial electricity rate.

The market is large and still growing. The U.S. solar industry had about 279 GWdc of cumulative installed capacity at year-end 2025, according to SEIA and Wood Mackenzie, and commercial installations grew year over year in 2025. But the rules changed materially in 2025. The federal tax law signed on July 4, 2025 shortened the window for solar tax credits, so timing now matters as much as system size. This guide walks through the inputs, the math, the 2026 tax rules, and the practical steps to pressure-test an installer quote.

Not tax or investment advice. The numbers below come from a transparent illustrative model, not a quote. Your results depend on your site, utility tariff, tax position and contract terms.

What Goes Into a Commercial Solar ROI Calculation

Return on investment for solar is net gain divided by net cost. A reliable estimate uses five inputs:

  1. System cost. SEIA and Wood Mackenzie reported benchmark commercial pricing of roughly $1.71 per watt DC in their Q4 2025 report. Small or complex projects often price higher.
  2. Energy production. Use a site-specific estimate from NREL’s PVWatts tool. Our example assumes 1,350 kWh per installed kW per year, which will be higher in sunny Southwestern locations and lower in cloudier regions.
  3. Electricity rate offset. The U.S. average commercial rate was about 13.5¢/kWh in April 2026, up from about 12.9¢ a year earlier, according to EIA data. Your own tariff, including demand charges, matters more than the national average.
  4. Incentives. The federal ITC, depreciation, and any state or utility programs.
  5. Operating costs and degradation. NREL’s Annual Technology Baseline uses fixed operating costs of about $21 per kW-year for commercial PV. Panels typically lose around 0.5% of output per year.

Here is how those inputs play out for a 200 kW example system:

ItemValue
System size200 kWdc
Gross cost at $1.71/Wdc$342,000
30% federal ITC−$102,600
Net cost after ITC$239,400
Year-1 production (1,350 kWh/kW)270,000 kWh
Year-1 bill savings at 13.5¢/kWh$36,450
Year-1 O&M (~$21/kW)−$4,200
Year-1 net savings$32,250

Start by pulling 12 months of utility bills. The commercial solar ROI calculator lets you enter your own rate, system size and incentives instead of relying on national averages.

Payback Period and the Metrics That Actually Matter

Simple payback divides net cost by annual net savings. It is a quick filter, not a full analysis. Net present value (NPV) and internal rate of return (IRR) account for the time value of money and make solar comparable to other capital projects.

In our model, which includes 0.5% annual degradation, flat electricity rates and a $20,000 inverter-replacement reserve in year 13, the 200 kW example produces:

  • Simple payback: about 7.6 years at 13.5¢/kWh
  • Unlevered 25-year IRR: about 12% after the ITC, with no depreciation
  • IRR with five-year MACRS: about 15%, assuming a 21% federal tax rate and full use of the deductions

These are outputs of one model with stated assumptions, not industry benchmarks. Financing costs, state taxes and rising or falling rates will move them.

The electricity rate you offset is the biggest driver. The chart below holds everything else constant and varies only the rate.

Modeled payback of a 200 kW commercial solar system by electricity rate. At the 13.5¢/kWh U.S. average, payback is about 7.6 years after the 30% ITC ($1.71/Wdc, 1,350 kWh/kW-yr, flat rates, no depreciation). Source: Green Energy Calculators model using SEIA/Wood Mackenzie pricing and EIA rate data, 2026.

What the chart shows: payback falls from about 14 years at 8¢/kWh to about 3.8 years at 25¢/kWh, and the national average of 13.5¢ lands near 7.6 years. Every few cents of rate changes payback by years, which is why a warehouse in a high-rate market can pencil out far better than an identical building in a low-rate one. Depreciation and state incentives would shorten each bar; low export credits or a roof replacement would lengthen it.

State averages show how wide the spread is. EIA data for April 2026 put average commercial rates near 25.8¢/kWh in California, 21.9¢ in New York and 8.4¢ in Texas, so the same system can have very different economics depending on location.

Two cautions when comparing quotes. First, check the assumed rate escalation. We hold rates flat, which is conservative; many installer proposals assume 2–3% annual increases, and that alone can make a project look far better. Second, ask for a PVWatts report for your address and confirm the quote includes any needed electrical upgrades.

Solar vs utility company · 25-year comparison

25-year totals: 3%/yr rate increases, 0.5%/yr degradation, no federal credit. Methodology

Total utility payments

$858,700

Total solar cost (installed + remaining bills)

$364,400

Net savings

+$494,300

Avg. monthly difference

+$0/mo

See my savings →

The 2026 Federal Rules: ITC Deadlines, Depreciation and State Incentives

Many online guides still describe the pre-2025 rules, including a 30% credit running through 2032. That is no longer accurate for solar.

The commercial ITC (Section 48E). The One Big Beautiful Bill Act, signed July 4, 2025, ended the technology-neutral clean electricity credits for wind and solar projects placed in service after December 31, 2027, with an exception for projects that began construction on or before July 4, 2026. In practice:

  • Projects that began construction by July 4, 2026 are not subject to the end-of-2027 placed-in-service deadline.
  • Projects that begin construction after July 4, 2026 must be placed in service by December 31, 2027.
  • Energy storage is not subject to that solar deadline.
  • The full 30% credit generally requires meeting prevailing wage and apprenticeship rules, though projects under 1 MW AC are exempt from those requirements.
  • Solar projects beginning construction after December 31, 2025 face “prohibited foreign entity” material-assistance restrictions, so equipment sourcing matters.

Because today is past the July 4, 2026 construction-start date, most new projects now face a tight window to be installed and interconnected by the end of 2027. Ask your installer in writing how the project qualifies.

How the credit works. The ITC is a dollar-for-dollar reduction in federal income tax, not a deduction. On a $342,000 system the credit is $102,600. Unused credits can generally be carried forward up to 20 years, and the Inflation Reduction Act’s transferability and elective-pay provisions let some businesses and tax-exempt entities monetize credits. Bonus credits of up to 10 percentage points each may be available for domestic content or energy-community siting, subject to IRS rules.

Depreciation. Five-year MACRS remains available for property that qualifies for the Section 48E credit. The depreciable basis is reduced by half of the credit, so on our $342,000 example the basis is $290,700 and the federal tax value at a 21% rate is about $61,000. Combined with the ITC, effective cost falls to roughly $178,000, or about 48% below the gross price, if you can use the deductions. Qualifying property may also be eligible for 100% bonus depreciation, and the older Section 48 rules that removed five-year treatment apply to projects that began construction after 2024 under that section, not to Section 48E projects. A tax advisor should confirm your treatment.

State and utility incentives. These vary widely and change often, so check the Database of State Incentives for Renewables & Efficiency (DSIRE) for your state, county and utility. Common types include property tax exemptions, sales tax exemptions, performance payments and grants. To estimate your federal credit, use the solar tax credit calculator.

Financing Options and How They Affect Your Return

Cash purchase, commercial loan, operating lease and power purchase agreement (PPA) produce different results depending on your tax position, cost of capital and balance-sheet goals.

Cash purchase. You claim the ITC and depreciation directly, and savings are not reduced by debt service. This usually gives the highest lifetime return if you have enough tax liability to use the benefits, but it ties up capital.

Commercial loan. You still own the system and claim the tax benefits, while spreading the cost over time. Interest lowers the return compared with cash, but in higher-rate markets electricity savings can offset a large part of the payment from the first year.

PPA or operating lease. A third-party developer owns the system, claims the tax benefits and sells you power at a contracted rate. There is no upfront cost, but you typically keep only a share of the savings, because the developer retains the tax benefits and a margin. Review escalators, term length, buyout options and roof-access terms carefully.

Tax-exempt organizations. Nonprofits, schools and local governments can generally use the IRA’s elective-pay (direct pay) option rather than relying on a tax-equity partner, which changes the economics of ownership.

Agricultural and rural businesses. Farms and rural small businesses may qualify for USDA REAP grants, which can be combined with the ITC in some cases. The agricultural solar calculator models this. Confirm current program funding with USDA, since availability changes.

For cost benchmarks by system type, see How Much Do Solar Panels Cost in 2026?

Net Metering, Demand Charges, and Rate Structure Considerations

Most commercial bills have an energy charge (per kWh) and a demand charge (per kW of peak demand). Solar reliably reduces energy charges. It is less dependable at reducing demand charges, because your monthly peak can occur when panels are producing little, such as on a cloudy afternoon or after sunset.

Export compensation. Net metering rules decide how surplus generation is credited, and they vary by state and utility. California is the clearest example of the shift: its net billing tariff, in effect for new applicants since April 2023, values exported power well below the retail rate, which pushes projects toward self-consumption and storage. Check your utility’s current tariff before relying on any installer’s export assumptions.

Storage. Batteries can shift solar output to peak hours and, when controlled well, reduce demand charges. Battery projects are not subject to the December 31, 2027 solar deadline, though the storage credit is scheduled to phase down starting with projects that begin construction in 2034. Storage adds cost, so model it separately rather than assuming it improves every project.

Time-of-use rates. If your tariff charges more during afternoon or early-evening hours, solar production that overlaps those periods is worth more. Peak windows differ by utility, so model your actual tariff rather than a generic one.

Run your numbers in the solar savings calculator and the solar payback calculator before requesting quotes.

Methodology, Assumptions and Sources

Model assumptions (illustrative, not a quote). 200 kWdc system; $1.71/Wdc gross cost; 30% ITC with no bonus adders; 1,350 kWh per kW per year; 0.5% annual degradation; $21 per kW-year O&M; flat electricity rates; $0.10/W inverter replacement reserve in year 13; 25-year life; pre-tax, unlevered, undiscounted payback. The MACRS case assumes the five-year schedule, a basis reduced by 50% of the ITC, a 21% federal rate and full use of deductions. Actual results vary.

Sources.

Tax rules and incentives change frequently. Verify current requirements with the IRS, your tax advisor and your utility before signing a contract.

Related calculators

Free tools for US homeowners — instant results, all 50 states.

Commercial Solar ROI Calculator 2026: §48E ITC & MACRS
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Frequently asked questions

Direct answers for US homeowners.

For a 200 kW system at about $1.71 per watt with the 30% federal tax credit, modeled simple payback is roughly 7.6 years at the 13.5¢/kWh national average commercial rate. It ranges from about 14 years at 8¢/kWh to under 4 years at 25¢/kWh. Depreciation, state incentives and rate increases can shorten it; weak export compensation can lengthen it.

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Popular state solar guides

Electricity rates and incentives vary — see data for your state.

CA California 33.25¢/kWh · 5.8h sun TX Texas 16.06¢/kWh · 5.6h sun FL Florida 15.3¢/kWh · 5.7h sun AZ Arizona 15.44¢/kWh · 6.5h sun NC North Carolina 14.94¢/kWh · 5.2h sun NY New York 29.38¢/kWh · 4.3h sun MA Massachusetts 30.14¢/kWh · 4.2h sun CO Colorado 16.72¢/kWh · 5.5h sun
View all 50 states →

How these numbers were calculated

Electricity rate
18.19¢/kWh — US average residential price. Source: EIA Electric Power Monthly, Table 5.6.B (year-to-date through July 2026), residential average retail price (July 2026) (EIA)
Solar production
4.5 peak sun hours/day × 0.82 system derate. Approximate state-average daily solar resource (peak sun hours) based on NREL solar resource data (NSRDB); not location-specific — use NREL PVWatts for an address-level estimate. (NREL PVWatts)
Installed price
$3.00 per watt before incentives. Blended 2026 US residential installed price used by this site; EnergySage marketplace reported about $2.60/W (mid-2026); full-market medians are higher.
Federal tax credit
$0 for homeowner-owned systems installed in 2026 — the 30% §25D credit ended Dec 31, 2025 (IRS)
Net metering
National blend — solar assumed to offset 75% of the bill (87% in full-retail net-metering states, 55–70% elsewhere).
Model
Version 2026.10 · 3%/yr electricity price escalation · 0.5%/yr panel degradation · simple payback = installed cost ÷ year-1 savings
Policy checked
· Full methodology · Report an error

Estimates only — not tax, legal or financial advice. Get at least three installer quotes and confirm incentives with your utility and a tax professional.

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