How much does commercial solar cost in 2026?

Commercial solar cost about $1.77 per watt (DC) installed in the second quarter of 2026, according to Wood Mackenzie and SEIA. That puts a 100 kW system at about $177,000, a 500 kW system at about $885,000 and a 1 MW system at about $1.77 million, before any tax credit or incentive. Commercial prices rose 5.6% year over year, the steepest increase of any segment, even as solar modules got cheaper. After the federal investment tax credit and depreciation, a business typically pays roughly half the sticker price.

This guide breaks down what drives the price, what a system really costs after incentives, how long it takes to pay back, and how to keep costs down. The numbers come from the Q2 2026 Solar Market Insight data reported by pv magazine. For the tax credit itself, see our commercial solar tax credit guide.

How does commercial solar pricing compare with other segments?

Commercial solar costs about half as much per watt as residential and roughly 70% more than utility-scale. Bigger systems spread fixed costs (design, permitting, interconnection, mobilization) over more watts, so cost per watt falls as size rises.

The national benchmark hides wide variation. Small rooftop systems under 100 kW often price above $2.00 per watt; large ground-mount or carport projects over 1 MW can come in well under the benchmark, though carports carry a structural premium of their own. Labor costs, permitting timelines and utility interconnection requirements vary sharply by state.

Why did commercial solar get more expensive in 2026?

Because everything except the panels got more expensive. Distributed-generation module prices fell about 16% year over year to $0.37 per watt, but Wood Mackenzie and SEIA attributed the overall increase to a roughly 15% average rise in logistics and freight costs and to Section 232 tariffs on aluminum, steel and copper that raise the cost of racking, wiring and other balance-of-system equipment. Modules are now less than a quarter of a commercial system’s installed price; racking, inverters, electrical work, labor, engineering, permitting, interconnection and overhead make up the rest.

• Hardware: modules, inverters, racking or carport structures, wiring, monitoring.

• Labor and installation: crews, equipment, electrical work, roof work.

• Soft costs: engineering, permitting, interconnection studies and upgrades, insurance, financing and developer margin.

What does commercial solar cost after the tax credit?

On a 500 kW system at $1.77 per watt, the 30% investment tax credit and federal depreciation together cut an $885,000 sticker price to roughly $460,000, about 52% of cost. Bonus credits for energy communities or domestic content cut it further.

The depreciation estimate assumes a 21% federal rate on a basis reduced by half the credit, undiscounted; your tax advisor will refine it. The tax credit only helps if you can use it or sell it. A business without enough federal tax liability can sell the credit for cash, usually at 80 to 92 cents per dollar for deals this size. Timing also matters: solar starting construction after July 4, 2026 must be placed in service by December 31, 2027. The energy community map guide shows how to check for the 10-point bonus, and our domestic content guide covers the other one.

How long does commercial solar take to pay back?

Typically about 4 to 8 years after incentives, depending mainly on your electricity rate and how much sun you get. A system that produces about 1,300 kWh per kW per year and offsets power at 14 cents per kWh saves about $182 per kW a year; at a net cost of about $0.92 per watt, that’s a simple payback of around five years.

These assume 1,300 kWh per kW per year and full offset of retail energy charges. Demand charges, net metering rules and time-of-use rates can change the math considerably, so ask your installer for a bill analysis based on your actual interval data. Use the estimator below to size a system from your own electricity use.

How big a solar system does a business need?

Divide your annual electricity use by your site’s production per kW. A business using 650,000 kWh a year in a location that produces 1,300 kWh per kW needs about 500 kW to offset 100% of its use. Most systems are sized below 100% offset for three reasons: roof or land space, utility net metering limits, and the fact that the last few percent of offset tends to be the least valuable. As a rough guide, a commercial rooftop fits about 10 to 15 watts per square foot of usable roof, so 500 kW needs roughly 35,000 to 50,000 square feet.

What does commercial solar cost to operate?

Ongoing costs are modest: typically monitoring, periodic cleaning and inspection, insurance, and one inverter replacement over the system’s life. Commercial modules usually carry 25- to 30-year performance warranties and lose roughly half a percent of output a year. String or central inverters often need replacement once, somewhere around years 10 to 15, which is worth budgeting for. Many owners sign an operations and maintenance contract that bundles monitoring, cleaning and repairs for a predictable annual fee. Over a 25-year life, a well-sited system typically produces electricity well below the price of grid power, which is why the long-term value usually exceeds the simple payback figure.

Should a business buy, lease or sign a PPA?

How can businesses lower commercial solar costs?

• Get at least three bids with itemized pricing, and compare cost per watt and production estimates, not just total price.

• Size to your load and interconnection limits to avoid costly utility upgrades.

• Claim every bonus you qualify for: energy community, domestic content and, for small projects in eligible areas, low-income communities.

• Stack state incentives such as rebates, renewable energy credits and performance payments.

• Sell the credit if you can’t use it, rather than letting it sit. Pooling several sites into one sale can improve pricing.

• Consider third-party ownership (a lease or PPA) if you’d rather not own the system; the developer claims the credit and prices it into your rate.

Is commercial solar still worth it in 2026?

For most businesses with suitable roof or land space and meaningful daytime electricity use, yes, provided the system can be placed in service by the end of 2027. Higher equipment and freight costs have pushed prices up, but the 30% or higher credit, depreciation and rising utility rates still deliver paybacks most businesses accept. The bigger risk is timing: design, permitting and especially interconnection can take a year or more. A project that can’t realistically be in service by December 31, 2027 should be modeled without the federal credit. See the One Big Beautiful Bill guide for every deadline.

Sources

• Wood Mackenzie / SEIA Q2 2026 pricing, via pv magazine USA

• IRS, 2025 Instructions for Form 3468

• Cenet Capital calculations; payback figures are illustrative.