Is Solar Worth It in Illinois in 2026?

Is solar worth it in Illinois? For the right home, it can be. This guide covers how solar works through Illinois winters, how Illinois Shines and net metering work now, and what to check before you buy.

Illinois doesn't look like Arizona.

It has cloudy winter days, snow, shorter daylight hours in December and a true four-season climate.

So homeowners often ask:

It can.

In fact, Illinois has one of the more developed state home solar programs in the country. It is called Illinois Shines, the state's Adjustable Block Program.

But that doesn't mean every Illinois home should install solar.

The better question is:

Solar Works in Illinois — Even With Winter

Solar panels make power from sunlight, not heat.

So cold weather by itself does not stop solar panels from making power.

What does change during the year is the amount of sunlight.

Illinois homes generally see:

• Stronger production during longer spring and summer days
• Lower production during shorter winter days
• Short-term production loss if snow covers the panels
• Seasonal swings in how much power the home uses

A well-designed solar system plans for those yearly patterns.

You don't judge solar by one gloomy January afternoon.

You judge it by how much power it makes in a year compared with how much your home uses in a year.

What Makes an Illinois Home a Good Solar Candidate?

Solar may be worth a serious look when a home has:

• Good roof exposure
• Limited shading
• A roof with useful life remaining
• Significant annual electricity use
• Favorable utility interconnection (grid hookup)
• Access to Illinois Shines
• Sound financing or cash economics
• Plans to stay in the home long enough to benefit

Roof design still matters.

A heavily shaded roof can sharply cut system output, even if the property gets plenty of sun overall.

Also, putting solar on a roof that needs replacing in three years can create avoidable costs later.

The house should be checked before the panels are.

What Is Illinois Shines?

Illinois Shines is the public name of Illinois' Adjustable Block Program. It is run on behalf of the Illinois Power Agency.

The program supports solar by buying the Renewable Energy Credits, or RECs, that come from qualifying projects.

The 2026–27 Illinois Shines program year began June 1, 2026, with new capacity, updated REC prices and updated program rules.

For homeowners, this can add real financial value on top of the power the system makes.

That is one reason solar math in Illinois can look different from neighboring states.

What Is a REC?

A Renewable Energy Credit stands for the environmental value of clean power.

A qualifying solar system produces two things:

Electricity and Renewable Energy Credits.

Under Illinois Shines, the program contracts to buy a set number of qualifying RECs from projects in the program.

This creates an incentive that can lower the real cost of going solar.

But homeowners should know exactly how that value reaches them.

Does the Homeowner Receive the Illinois Shines Payment Directly?

Not always.

Illinois Shines works through Approved Vendors.

The contracting utility pays the Approved Vendor for qualifying RECs. Your agreement then decides how the value of that incentive is passed on to you.

That can appear as:

• A reduction in system price
• A promised payment to the customer
• Another structure defined in the contract

This applies to qualifying small distributed-generation projects approved under the new 2026 REC contract. The program now pays 50% of the REC incentive at energization (when the system is turned on). The rest is spread evenly over the next six years.

This is an important 2026 change.

Homeowners should ask:

Illinois Added a New 2026 REC Adder

Illinois responded directly to the loss of the federal home solar tax credit.

For the 2026–27 program year, Illinois Shines added a $20-per-REC incentive adder. It is for qualifying customer-owned Small Distributed Generation projects that will not get the former federal clean-energy tax credit.

That is significant.

It doesn't replace the former federal credit dollar for dollar. But it shows that Illinois still actively supports home solar despite federal policy changes.

What Happened to the Federal 30% Solar Tax Credit?

The old federal Residential Clean Energy Credit no longer applies to new home clean-energy property placed in service after December 31, 2025.

Qualifying property installed between 2022 and the end of 2025 could receive the 30% credit. Property placed in service after December 31, 2025 does not qualify.

This matters because many older solar websites still advertise:

“Get 30% back on your solar system.”

For a new 2026 home installation, that should not automatically show up in the financial analysis.

Illinois homeowners should instead look at:

• Illinois Shines value
• Net-metering economics
• Actual installation price
• Financing cost
• Expected annual production
• Electricity rates
• Roof condition
• Expected ownership period

Does Illinois Have Net Metering?

Yes, but the rules changed a lot starting January 1, 2025.

Net metering is credit for extra solar power you send to the grid. For new home and small business solar systems in ComEd, Ameren and MidAmerican territories, the old full-retail net-metering setup is generally no longer available.

New qualifying systems are under supply-only net metering.

That's a crucial difference.

What Is Supply-Only Net Metering?

Imagine your solar system makes extra power and sends it back to the grid.

Under the older full-retail setup, qualifying customers could get credits for both the supply part and the per-kWh delivery part of the electric rate.

Under the current setup for systems connected starting in 2025, qualifying homeowners get credits tied mainly to the supply portion of the bill.

Delivery charges still apply to power drawn from the grid.

That makes one idea more and more important: self-consumption, or using your own solar power at home.

Power your panels make and your home uses right away can often be worth more than power sent to the grid.

Why System Sizing Matters More Now

Under full-retail net metering, sending extra power to the grid could pay fairly well.

Under supply-only net metering, the math of sending power out is different.

So simply installing the biggest possible solar system may not be the smartest plan.

A homeowner should understand:

• Annual household consumption
• Daytime consumption
• Solar production timing
• Expected exports
• Supply-credit value
• Remaining delivery charges

This is a stronger reason to size the system around the actual house.

ComEd and Ameren Customers Should Know Their Utility Rules

Most Illinois homeowners looking at rooftop solar will be in one of several utility territories.

Two major ones are:

• ComEd
• Ameren Illinois

Illinois Shines notes that new systems in ComEd, Ameren and MidAmerican territories fall under the state's updated supply-only net-metering rules.

Municipal utilities and rural electric cooperatives can have their own policies.

So the first serious solar question should be:

What About HVAC and Energy Efficiency?

Illinois homes deal with both summer heat and winter cold.

So high energy use at home can have many causes:

• Old central air-conditioning
• Aging heat pumps
• Electric resistance heating
• Poor insulation
• Air leakage
• Poor ductwork
• Old windows and doors
• Electric water heating

Solar may offset wasted power.

But sometimes the smarter plan is to cut that waste first.

A home using 16,000 kWh a year because of inefficient equipment may need much less solar once those problems are fixed.

What About Battery Storage?

Battery storage solves a different problem.

Solar makes power.

A battery stores it.

Battery storage may appeal to Illinois homeowners concerned about:

• Storm outages
• Keeping sump pumps running
• Refrigeration
• Medical equipment
• Internet
• Critical lighting
• Selected HVAC loads

Batteries may also become more appealing as solar power sent to the grid becomes worth less than power used at home.

But batteries add cost.

The goal should be to find out whether storage solves a real household problem — not just whether it can be added to the proposal.

So, Is Solar Worth It in Illinois?

For many homeowners, yes.

Illinois has several advantages:

• A mature state solar program
• Illinois Shines REC incentives
• A new 2026 customer-owned REC adder
• Net-metering access
• Meaningful household electricity demand
• Strong solar production during much of the year

But the savings are not automatic.

The best projects still start with the home.

Start With the Home, Not the Product

Ashborn Partners helps Illinois homeowners look at solar, battery storage, heating and cooling, and whole-home energy options in one personal home-energy review.

We don't start by assuming every home needs solar.

We start with your usage, your home and your goals.