Are solar panels worth it in Illinois? The honest 2026 answer.

For a lot of Illinois homeowners, the question starts with an electric bill.

Maybe it is June in Naperville. The air conditioner has been running for a few weeks, you open the ComEd app expecting the usual summer increase, and the number is noticeably worse than last year. Before long, you are looking at solar quotes and trying to answer a question that sounds simple but really isn't:

Are solar panels actually worth it in Illinois?

For some homes in 2026, the answer may be yes. For others, the roof, usage, price, financing, or contract terms make the answer no. The math also looks different than it did a year ago.

The 30% federal residential tax credit that helped drive solar adoption for years is no longer available for systems purchased by homeowners and installed after 2025. At the same time, ComEd electricity prices have climbed substantially, while Illinois continues to offer one of the more valuable state solar incentive programs in the country.

Those changes pull the economics in opposite directions. Losing the federal credit hurts. Higher electricity prices and Illinois incentives help.

Whether solar makes sense for your house ultimately comes down to how those factors interact with your roof, electricity usage, financing, and how much of the power your panels produce you can actually use.

Here is what the numbers look like in 2026.

What changed for Illinois solar in 2026

Three major pieces of the solar equation have shifted, and understanding them makes the rest of the math much easier.

The first is the federal tax credit.

The Residential Clean Energy Credit under Section 25D previously allowed homeowners to claim 30% of the cost of an eligible solar installation. For residential systems, that credit ended for installations completed after December 31, 2025.

There was no gradual phase-down for homeowners. If you purchase a system with cash or a loan and install it in 2026, you cannot claim the old 30% Section 25D credit.

That does not mean federal incentives disappeared from solar entirely. The commercial clean electricity investment credit under Section 48E remains relevant to systems owned by third parties. That is one reason leases and power purchase agreements can look different financially from homeowner-owned systems in 2026.

It also means the buy-versus-lease calculation deserves another look rather than relying on advice written when every homeowner could assume a 30% federal credit. We cover that comparison separately in our Illinois solar lease versus buy guide.

The second change is electricity prices.

ComEd's Price to Compare, which represents the supply portion of an electric bill, reset to 10.399 cents per kilowatt-hour on June 1, 2026. That is roughly 50% higher than two years earlier, according to the Citizens Utility Board.

A major contributor has been rising capacity costs in the PJM electricity market, where growing demand, including demand from data centers, has put additional pressure on grid costs.

And remember, the supply rate is only part of what you pay. Delivery charges and other fees are added on top.

Ameren customers have their own rates and rate schedules, so the exact numbers are different downstate. But the principle is the same: the more expensive utility electricity becomes, the more valuable every kilowatt-hour you avoid buying from the grid becomes.

The third change is specific to Illinois.

Full retail net metering changed for new systems beginning January 1, 2025, while state-level incentive programs continue to support qualifying projects through REC contracts, utility rebates, and other mechanisms.

Those two programs now play a much bigger role in determining whether solar pays off.

How Illinois Shines REC contracts create project value

Illinois Shines is the state's Adjustable Block Program, and it does not work like a traditional tax credit.

Instead of giving a homeowner a percentage of installation cost back at tax time, the program uses contracts under which utilities purchase Renewable Energy Credits from Approved Vendors for qualifying projects.

One REC represents the environmental attributes of 1,000 kilowatt-hours of qualifying generation. When the RECs are sold, the purchaser owns those renewable-energy attributes.

The Approved Vendor's REC contract can create project value in addition to the value of electricity used at the home. The customer's Disclosure Form and agreement control whether that value appears as a price reduction, separate payment, or another benefit.

For qualifying 0-10 kW AC projects in the 2026-27 program year, the base price is $70.37 per REC in Group A/Ameren and $80.77 in Group B/ComEd. A $20-per-REC customer-owned Small DG adder may apply when all Program requirements are met.

That additional value is especially important now that the residential federal credit has disappeared.

The payment structure also matters.

Under the Small DG schedule effective for 2026-27, the contracting utility pays 50% of the REC contract value to the Approved Vendor at energization, with the remainder paid ratably over the following six years.

Consider a 7.5 kW system in ComEd territory producing approximately 9,000 kWh annually.

At that illustrative production level, the project would create about nine RECs per year. The gross contract value still depends on the approved production estimate, utility group, category, adders, collateral, and Program adjustments.

The Approved Vendor's payment schedule is not automatically the homeowner's payment schedule. The Disclosure Form and agreement determine how much value reaches the customer, when, and in what form.

For a qualifying project, the customer value disclosed through Illinois Shines can materially affect the economics. The amount, recipient, form, and timing must come from the Disclosure Form and agreement rather than a generic statewide example.

Net billing vs. net metering in Illinois

This is where the solar calculation gets a little more complicated.

Before 2025, qualifying Illinois solar customers could receive full retail net metering. When their panels produced more electricity than the home needed and sent that excess power back to the grid, they could receive credits reflecting more of the retail value of that electricity.

Systems that qualified under the previous rules retain their grandfathered treatment.

New residential systems interconnected beginning in 2025 operate under supply-only net billing. Excess solar electricity is generally credited based on the supply portion of the electric rate rather than offsetting the entire retail rate, including delivery.

That difference matters.

Imagine your panels produce an extra kilowatt-hour at noon and send it to the grid. Later that evening, your house needs a kilowatt-hour from ComEd.

Those two kilowatt-hours are no longer necessarily equal financially.

The electricity you export earns a supply credit. The electricity you purchase later includes supply plus applicable delivery charges and other costs.

Illinois created another incentive to help offset that change: the smart inverter rebate.

For qualifying ComEd and Ameren customers, that rebate can be worth $300 per kilowatt of installed solar capacity. On a 7.5 kW system, that works out to $2,250.

Additional battery incentives may also be available for qualifying customers participating in applicable time-of-use or peak-demand programs.

The bigger lesson is that using your solar electricity inside your home is now more valuable than exporting it.

A household running air conditioning, laundry equipment, appliances, a home office, or an EV charger while the sun is out may consume a large percentage of its solar production directly.

A house that sits mostly empty during the day may export much more of its production and then purchase electricity back from the grid in the evening.

Those two houses could install identical solar arrays and end up with noticeably different economics.

That is why system design matters more under Illinois' current rules. The goal should not automatically be to cover every available square foot of roof with panels. The system should be designed around how and when your household actually uses electricity.

For some homeowners, that also makes battery storage worth evaluating rather than treating it purely as an emergency backup product.

What does the Illinois solar payback period actually look like?

Consider a fairly typical single-family home in the Chicago suburbs using around 10,000 kWh of electricity per year.

A 7.5 kW solar system installed in 2026 might cost somewhere between $18,000 and $28,000 before incentives. The exact price depends heavily on equipment, roof complexity, installer pricing, electrical work, and financing.

Our Illinois solar cost guide breaks that range down in detail.

From there, start subtracting the incentives.

A qualifying 7.5 kW system could receive a $2,250 smart inverter rebate.

Then there is Illinois Shines. The Approved Vendor's REC contract value depends on approved production, the applicable REC price, project category, adders, and Program adjustments. The Disclosure Form and agreement determine what value reaches the customer and when.

Finally, there are the electricity savings.

Every kilowatt-hour your home consumes directly from the panels is electricity you do not need to purchase from the utility. Exported electricity has value too, although under the current net billing structure it is generally worth less than electricity consumed directly inside the home.

Put everything together and the result is a home-specific payback period, not a defensible statewide range. The calculation should show the exact installed price, contract terms, production, utility treatment, incentive treatment, maintenance, and future-rate assumptions.

Any payback result is an estimate unless it is expressly guaranteed in the customer's binding contract.

A sunny south-facing roof with substantial daytime electricity usage could perform better. A shaded roof with most electricity consumption occurring after sunset could perform worse.

Ameren customers will also see different numbers because their electricity rates and applicable REC pricing differ.

The important comparison is what happens after payback.

Many solar panels carry long performance warranties and may continue producing beyond the modeled payback point. Warranty coverage, degradation, equipment replacement, maintenance, and actual production should remain in the comparison.

And the electricity being produced in year 15 or year 20 is replacing whatever utility electricity costs at that point, not what it costs today.

When solar is not worth it in Illinois

Solar can work very well in Illinois. That does not mean every Illinois house should have it.

A heavily shaded roof is one of the clearest examples. If mature trees or neighboring structures block direct sunlight for much of the day, production can fall enough that the economics simply do not work.

Roof age matters too.

If your roof has fewer than roughly ten years of useful life remaining, replacing it before installing solar may make more sense. Otherwise, you could end up paying to remove and reinstall the array when the roof needs replacement, eating into the savings the system was supposed to create.

Very low electricity usage can also make solar less attractive.

A household using fewer than roughly 5,000 kWh per year has fewer utility purchases for solar to replace, while many of the fixed costs associated with installation remain.

Your expected time in the home matters as well.

If you know you are moving in three or four years, ownership, financing, REC obligations, and transfer terms matter. Solar can add value to a home, but predicting exactly how much a particular buyer will pay for it is difficult.

Financing can change the equation too. A system with strong underlying economics can become a bad deal if it is paired with an expensive loan, large dealer fees, or financing terms that erase much of the savings.

If those issues do not apply to your house, the more useful question becomes less about whether solar works in Illinois and more about whether the specific system and deal being offered to you make sense.

Does Illinois get enough sunlight for solar?

Illinois is obviously not Arizona, but that does not mean solar panels struggle here.

Much of Illinois averages a little over four peak sun hours per day across the year. A comparable system will produce less electricity here than it would in Phoenix, but sunlight is only one side of solar economics.

Cold weather can improve panel efficiency. Winter production is lower primarily because days are shorter and weather is cloudier, not because panels stop working when temperatures fall.

Snow can temporarily reduce production when it covers the array, although snow often slides or melts off tilted panels after conditions improve.

Over a full year, a well-positioned Illinois system can produce roughly 75% to 80% of what the same array might generate in a much sunnier location such as Phoenix.

But sunshine alone does not determine value. The result depends on reduced utility purchases, export credits, project price, contract terms, and qualifying incentives.

Illinois combines usable solar production with REC incentives through Illinois Shines for qualifying projects. A sunny climate by itself therefore does not determine whether a particular project has better economics.

That is why looking at a national "best states for solar" map based only on sunshine can be misleading.

What to do before getting a solar quote

Before talking to an installer, pull your last 12 months of ComEd or Ameren bills. You want actual annual electricity consumption, not a salesperson's estimate.

Check the age of your roof and look at where the usable roof space faces. South-facing sections are typically excellent for production, while west-facing panels can also be valuable because they generate more electricity later in the day.

Think about when your household consumes electricity. If someone works from home, you charge an EV during the day, or you use significant air conditioning during summer afternoons, your self-consumption could be relatively high.

Ask for the solar production estimate in kilowatt-hours, not just a percentage such as "100% bill offset."

Then ask exactly which assumptions were used to calculate projected savings: utility rate, annual rate changes, the customer benefit disclosed through Illinois Shines, net-billing credits, utility rebates, financing costs, degradation, maintenance, and battery costs.

Most importantly, make sure the company handling your project is an Illinois Shines Approved Vendor or works through one. The REC incentive is valuable enough that you do not want it treated as an afterthought.

We work with homeowners across Illinois to size systems around actual electricity usage, compare ownership and financing options, and coordinate installations through vetted partners.

If you want to know whether solar makes sense for your house, schedule a free consultation and bring a recent electric bill. We can run the numbers using your actual usage instead of a statewide average.

Frequently asked questions