Commercial Solar ROI in Ohio: How to Model Payback

Ohio market insight · Renewables & solar

Updated September 27, 2026Ohio Commercial Energy editorial teamHow we review content Book a free 15-min bill review

Market-reference note: Numerical default-price examples below retain their cited 2026 reference period. They are historical class-level context, not a current account quote. Confirm the applicable business rate, components and effective dates on your bill before comparing an offer. How to establish your benchmark.

The short answer

On-site solar in Ohio pays back by displacing kilowatt-hours you would otherwise buy, so its value depends on your all-in energy rate for self-consumed kWh, not your total bill. Net metering lets you size a system up to 120% of your usage, but exported power is credited only at the energy component of the utility's standard service offer. With the federal clean-electricity credit now largely out of reach for new projects, many commercial systems modeled today show simple paybacks in the low-to-high teens of years, so the model has to be built on your own bill, a firm quote and your tax position.

What on-site solar actually saves on an Ohio bill

A commercial electric bill has parts that solar reduces and parts it barely touches. Model them separately; averaging your total bill by total kWh overstates savings.

Bill component	Does solar reduce it?	Why
Generation/supply (SSO or supplier contract price)	Yes, for every self-consumed kWh	You buy fewer kWh
kWh-based delivery riders and the kWh excise tax	Yes, per kWh avoided	Charged per kWh delivered
Demand charges ($/kW)	Rarely, and unreliably	One cloudy interval during your monthly peak sets the charge
Capacity tag (PLC) cost	Only partly	Tags are set from load in PJM's summer peak hours, which often fall late in the afternoon when solar output is declining
Customer and fixed monthly charges	No	Not usage-based

Your avoided cost per self-consumed kWh is roughly your supply price plus any per-kWh delivery charges and the excise tax. For a small business on FirstEnergy default service, the generation price alone is about 9.4¢/kWh for June 2026–May 2027 (Ohio Edison ~9.38¢, CEI ~9.45¢, Toledo Edison ~9.43¢). If you are on a supplier contract, use the contract price instead. For how each line on the bill is built, see understanding commercial energy cost components; for the demand side, see demand charges explained.

Net metering rules that shape system size

Ohio's net metering rule (OAC 4901:1-10-28) sets three limits that matter for commercial ROI:

Sizing cap. A customer-generator must size its system so it does not exceed 120% of its electricity requirements at interconnection.
Export credit. For customers on the utility's standard tariff, net excess generation becomes a monetary credit at the energy component of the utility's standard service offer, carried forward on future bills. The utility is not required to pay cash, and credits can be forfeited if service ends.
Shopping customers. If you buy supply from a competitive retail supplier, the supplier and customer can set their own terms for excess production. Read that contract before assuming any export value.

The economic takeaway: because exports earn less than the retail value of self-consumed kWh, the best-performing systems are sized to your daytime load, not to 120% of annual usage. A plant that runs two shifts on weekdays will self-consume far more of its output than an office that is empty on weekends.

The federal credit window has mostly closed

Under P.L. 119-21 (signed July 4, 2025), wind and solar projects qualify for the clean-electricity investment credit only if construction began by July 4, 2026, or the project is placed in service by December 31, 2027. Projects starting construction after 2025 must also satisfy new prohibited-foreign-entity rules; for solar facilities starting construction in 2026, IRS Notice 2026-15 sets the non-foreign "material assistance" threshold at 40%, rising five points a year.

What that means for a project being scoped now:

If construction did not begin by July 4, 2026, the credit is available only if the system is in service by the end of 2027 and passes the foreign-entity test. Some fast rooftop projects may make it; most pro formas should not depend on it.
Whether a project "began construction" in time is itself contested. A federal district court vacated IRS Notice 2025-42 in June 2026, and an appeal is expected, so treat safe-harbor claims as a question for tax counsel.
The same law restored 100% bonus depreciation for property acquired after January 19, 2025. How solar equipment is classified for depreciation depends on credit status and construction dates.

Confirm every tax assumption with a tax adviser before signing a contract.

An illustrative payback model

The example below is illustrative only. Every input is an assumption you should replace with your own data.

Assumptions: 600,000 kWh/yr manufacturer on FirstEnergy default service; 300 kW-DC rooftop system; 1,150 kWh produced per kW-DC per year (check your site in NREL PVWatts); 85% of output used on site; 11¢/kWh avoided value for self-consumed kWh (about 9.4¢ supply plus 1.6¢ of per-kWh riders and tax); 6¢/kWh credit for exports; $15 per kW-DC per year for operations and maintenance; installed cost of $1.77 per watt, the Q2 2026 national average for commercial systems reported by Wood Mackenzie and SEIA.

Line	Value
Annual production (300 × 1,150)	345,000 kWh (57.5% of usage, well under the 120% cap)
Self-consumed (85%) × 11¢	293,250 kWh = $32,258
Exported (15%) × 6¢	51,750 kWh = $3,105
Less O&M	−$4,500
Net first-year savings	$30,863
Installed cost	$531,000
Simple payback, no federal credit	about 17.2 years
Simple payback, if a 30% credit applies	about 12.0 years

Two sensitivities show why a generic answer is misleading. If your avoided value is 14¢ instead of 11¢ (a higher-priced contract or larger kWh-based riders), net savings rise to about $39,660 and payback without the credit falls to about 13.4 years. If your quote comes in at $2.25 per watt instead of $1.77, payback without the credit stretches to about 21.9 years. The model ignores panel degradation, future rate changes, depreciation and financing costs; add them in a full cash-flow model.

What moves the answer

Your avoided rate. Rising Ohio default-service prices (FirstEnergy's small-business generation price rose from ~8.9¢ to ~9.4¢ on June 1, 2026) improve solar economics; a cheap fixed supply contract weakens them. Compare against your price to compare, not the headline bill average.
Roof life and structure. If the roof will need replacement within the array's expected life, either re-roof first or price the removal and reinstallation into the model, along with any structural reinforcement.
Installed cost. National pricing averages hide wide spreads for small rooftop jobs, interconnection upgrades and electrical service work. For the 2026 equipment and trade picture, see solar and storage costs under 2026 tariffs.
Other funding. USDA REAP grants have been paused since April 1, 2026 pending new rules, though REAP guaranteed loans are still accepted. C-PACE financing is available through participating Ohio energy special improvement districts, and the Ohio Air Quality Development Authority has approved 2026 financing for small-business projects that include renewable generation.
Storage. A battery can target demand charges and capacity tags that solar alone misses, and it keeps federal credit eligibility for projects starting construction through 2033. See energy storage solutions for Ohio businesses.

Ownership, lease or third-party PPA

Owning the system captures all savings and any tax benefits but requires tax appetite and capital. A lease or third-party power purchase agreement shifts capital and maintenance to an investor, who keeps the tax benefits and prices them into your rate. HB 15 now lets mercantile customers (over 700,000 kWh a year) host generation owned by a third party behind the meter. For the structures a mid-size buyer can actually sign, see renewable PPAs for mid-size Ohio businesses; for whether you need project-backed power or certificates at all, see RECs vs. renewable PPAs; for every option side by side, see the renewable energy options pillar guide.

FAQ

Can an Ohio business get paid cash for excess solar generation?

Not under the standard utility net metering tariff. Excess generation becomes a bill credit at the energy component of the standard service offer and carries forward; a competitive supplier may offer different terms by contract.

How large a solar system can a business net meter in Ohio?

The system must be sized so it does not exceed 120% of the customer's electricity requirements at interconnection. Economically, sizing to daytime load usually beats sizing to the cap because exports earn less than self-consumed kWh.

Is the federal solar tax credit still available for a new commercial project?

Only if construction began by July 4, 2026, or the project is placed in service by December 31, 2027, and it meets the foreign-entity sourcing rules. Confirm eligibility with a tax adviser before relying on it.

Will solar lower my demand charges?

Usually not by much. Demand charges are set by your highest interval each month, and a single cloudy interval can set that peak; pairing solar with storage or load controls is the more reliable way to cut demand.