If you've started looking into solar in Illinois, you've likely run into Illinois Shines, solar incentives and net metering right away. This guide explains how each one works today and what to ask before you sign. You've probably seen terms like these:
- Illinois Shines
- RECs
- Net metering
- Approved Vendor
- Supply-only credits
You may also have heard a salesperson tell you how much money you're going to “get back.”
Illinois does have real solar incentives.
But knowing how they work is critical.
What Is Illinois Shines?
Illinois Shines is the public name of the state's Adjustable Block Program.
It is run on behalf of the Illinois Power Agency. It supports qualifying distributed solar (systems at homes and businesses) and community solar projects.
Illinois Shines buys the Renewable Energy Credits that come from qualifying solar power.
The current 2026–27 Program Year began June 1, 2026, with new capacity limits, REC prices, contract terms and consumer-protection rules.
Unlike the former federal home solar tax credit, Illinois Shines does not depend on federal money.
The program states that it is funded through charges on Illinois utility bills. Those charges support the state's Renewable Portfolio Standard (its clean-energy target).
What Is a Renewable Energy Credit?
When a qualifying solar system makes clean power, it also creates environmental value.
That value can be counted as Renewable Energy Credits, or RECs.
Illinois utilities and others use RECs to meet clean-energy requirements.
Illinois Shines sets up a contract to buy a set number of those RECs from solar projects in the program.
That REC contract is where a large share of Illinois' solar incentive value comes from.
Is Illinois Shines a Cash Rebate?
Not exactly.
This difference matters.
Illinois Shines is not like a simple coupon. Homeowners do not each get a check from the state right after installation.
Projects take part through an Illinois Shines Approved Vendor.
The contracting utility buys the RECs from that Approved Vendor.
Your contract then decides how that value reaches you. It could be a lower project price, a direct promised payment, or another set financial structure.
So if someone says
“Illinois will give you $15,000 for solar,”
ask who gets the REC payment and how much is passed to you. Ask when you get it, and where your contract spells out that promise.
The Illinois Shines Payment Schedule Changed in 2026
This is one of the biggest current changes.
This applies to qualifying Small Distributed Generation (small DG) projects approved under the 2026 REC contract. They now get 50% at energization (when the system is turned on). The other 50% is spread evenly over the next six years.
Before, many small DG projects got 100% of the REC payment at energization.
That doesn't always mean you get your incentive on the same schedule.
The Approved Vendor's customer contract controls how promised incentive value is passed through.
Illinois Shines now requires Approved Vendors who promise customer pass-through payments to explain how those payments will be made.
That's valuable consumer protection.
Illinois Added a $20-per-REC Adder in 2026
Illinois also added a new incentive in direct response to the loss of the federal home clean-energy tax credit.
For Program Year 2026–27, there is an extra $20 per REC. It goes to qualifying customer-owned Small DG projects that do not get the former federal home clean-energy tax credit.
So Illinois Shines became more valuable for some customer-owned projects just as federal home solar incentives declined.
That doesn't always make up for the full federal-credit loss. But it should be part of any honest 2026 Illinois solar analysis.
What Happened to the Federal Solar Tax Credit?
The federal Residential Clean Energy Credit ended for new home clean-energy spending after December 31, 2025.
The IRS states that the former credit equaled 30% of qualifying home clean-energy costs. It applied to property installed from 2022 through the end of 2025.
Property placed in service after December 31, 2025 does not qualify.
So an Illinois homeowner looking at solar in 2026 should not assume a 30% federal credit.
That makes it even more important to understand Illinois Shines correctly.
How Did Illinois Net Metering Change?
A second major policy change took effect January 1, 2025.
New qualifying home and small business solar customers in ComEd, Ameren Illinois and MidAmerican territory generally no longer get the former full-retail net metering. That older setup credited extra solar power at the full retail rate, not just the supply part.
Instead, systems installed starting January 1, 2025 are under supply-only net metering.
What Does Supply-Only Net Metering Mean?
Say your home is using power while your solar panels are producing.
Solar power used right away in the home cuts the amount you need to buy from the grid.
That's usually the simplest value.
But if your system makes more than you're using, the extra goes to the grid.
Under the current Illinois rules, eligible new systems get credits that apply to the supply part of the bill. Older solar customers may still get the broader full-retail credit.
You still pay delivery charges for power pulled from the grid.
That makes using your own solar power more and more important.
What Happened to Existing Solar Customers?
Some systems were already getting qualifying full-retail net metering before the January 1, 2025 change. They generally keep that setup. Exceptions apply if major changes trigger a new interconnection (grid hookup) agreement or other set conditions apply.
Illinois Shines notes that existing ComEd and Ameren customers can lose grandfathered status after certain major system changes.
So if you plan to expand an older system, learn how it could affect your credits first.
What If I Use an Alternative Electric Supplier?
Illinois has retail electric choice in many areas.
So a homeowner may get delivery from ComEd or Ameren while buying supply from another company.
Illinois Shines warns that customers who switch suppliers may need to re-enroll in net metering with the new supplier.
Failing to do so can sharply cut the value you get from your solar system.
It's a small paperwork detail that can cost real money.
What About Municipal Utilities and Electric Cooperatives?
Their rules can be different.
Illinois Shines notes that city-owned utilities and rural electric co-ops may set their own rules. That covers net metering, export credits, credit rollover and interconnection.
So homeowners outside ComEd, Ameren or MidAmerican territory need to check with their local utility directly.
Does Illinois Offer Property-Tax Treatment for Solar?
Illinois law lets qualifying property owners with solar systems claim an alternate value for certain improvements.
Under the Property Tax Code, the assessment can be based on the lower of two values. One is the property's value with the solar system. The other is its value as if it had standard energy equipment.
Check with your county assessment office about eligibility and how to file for your property.
How Do I Know My Illinois Shines Incentive Is Legitimate?
This is where Illinois' consumer-protection system matters.
Ask for:
- The Approved Vendor's name
- Your Illinois Shines Disclosure Form
- The estimated REC quantity
- The REC price
- The incentive value included in the deal
- How and when pass-through payments are made
- The project's application status
Illinois Shines also runs a Solar Restitution Program. It helps certain customers who were promised incentive payments by program participants but did not get them as promised. In 2026 the program expanded to cover customers who got only part of a promised payment.
That doesn't remove all risk.
But it gives Illinois homeowners protections that don't exist in every state.
Should You Choose a Solar Company Based on the Incentive Alone?
No.
Illinois Shines can make solar more attractive.
But the incentive does not fix:
- An overpriced project
- Poor financing
- Bad roof exposure
- Heavy shading
- An old roof
- Unrealistic production assumptions
- A system that is too large
- An inefficient home
The incentive should improve a good project.
It shouldn't make you ignore a bad one.
What Should Illinois Homeowners Ask Before Signing?
- Is this project in Illinois Shines? Get confirmation.
- Who is the Approved Vendor? The installer and the Approved Vendor may not always be the same company.
- How much REC value is being created? Ask for the number.
- How is that value passed to me? Price cut, payment, or another structure?
- When will I receive it? This is extra important under the new 2026 payment schedule.
- Does my proposal assume a federal 30% credit? It should not assume that for a new 2026 home project.
- Which net-metering setup applies? New systems generally get supply-only credits in the big investor-owned utility areas.
- Who is my electric supplier? Changing suppliers can affect enrollment and credits.
Illinois Has Strong Solar Policy — but Details Matter
Illinois is still one of the more interesting home solar states in 2026.
The value can include Illinois Shines REC payments and the new $20-per-REC customer-owned adder. It can also include power bill savings and net-metering credits.
But each piece needs to be calculated correctly.
Let Ashborn Help You Look at the Whole Picture
Ashborn Partners helps Illinois homeowners weigh solar alongside HVAC, battery storage, energy efficiency and other whole-home energy options.
The largest available incentive doesn't tell you which upgrade your home needs most.