Illinois solar incentives in 2026: what's real, what pays, what changed.

Four stack on one home system: Illinois Shines pays $80.77 per REC in ComEd territory ($70.37 Ameren) for small systems, plus a $20/REC adder for customer-owned systems; ComEd and Ameren pay a $300/kW smart-inverter rebate directly to you; supply-only net metering credits the power you export, with unused credits carrying forward; and a property-tax special assessment keeps the system's value off your tax bill. The federal residential credit expired December 31, 2025 — though lease and PPA offers can still carry federal value under dated rules. There is no Illinois sales-tax exemption for solar, and no state-level income tax credit either.

Not for purchases. The federal residential credit (Section 25D) expired December 31, 2025, so a system bought with cash or a loan in 2026 earns no federal tax credit. What remains is offer-specific: lease and PPA providers can still pass through federal value when their projects qualify under the dated lanes created when the begin-construction window closed on July 4, 2026.

Under the 2026 rules, the program pays your state-approved vendor — not you directly — 50% of the REC contract value when your system is energized and the remainder ratably over the subsequent 6 years, based on 15 years of expected production. Reputable installers pass that value through as a lower project price, which is why the same system can be quoted very differently. Always ask exactly how the REC value is reflected in your quote.

For the 2026–27 program year, Illinois Shines pays an extra $20 per REC for systems that are customer-owned and take no federal investment credit — a state counterweight to the expired federal credit. On a typical small system producing hundreds of RECs over 15 expected years, it meaningfully raises the total REC value, and it only applies when you own the system rather than lease it.

ComEd and Ameren pay $300 per kW of installed solar capacity — about $2,790 on a 9.3 kW system — directly to you after installation, claimed through your utility with your installer's help. The solar half of this rebate carries no ongoing obligation. Batteries earn $300 per kWh of storage under the same program, but as of June 1, 2026 the battery half does carry obligations: it commits you to your utility's virtual power plant, and in ComEd's case to a Qualifying Utility Product for the life of the battery.

In ComEd territory, yes — and it is two commitments, not one. Taking the $300/kWh storage rebate requires participating in ComEd's Scheduled Dispatch Virtual Power Plant for a five-year program term, and separately requires taking supply under a Qualifying Utility Product — Rate BESH is one option, but not the only one — for the life of the energy storage facility. The five-year clock ends; the qualifying-rate condition has no published end date. In Ameren territory, storage-rebate eligibility has required virtual power plant enrollment since June 1, 2026 per Ameren's DER Bulletin 2026-04; its Rider SD VPP pays $10.00 per kW of seasonal performance over at least five summer periods, and enrollment doesn't change your supply. This is the single most under-reported condition in Illinois solar, which is why most pages still describe it as a simple rate enrollment — or, just as often, wrongly describe Rate BESH itself as the requirement rather than one option that satisfies it.

Mostly, with four real differences. The REC price is lower — $70.37 in Ameren's Group A versus $80.77 in ComEd's Group B for systems 10 kW AC and under. Ameren credits both supply and transmission on exports, where ComEd credits supply only. Ameren has no equivalent to ComEd's Hourly Pricing plan, so the whole-bill credit path does not exist in Ameren territory. And ComEd's battery rebate commits you to a qualifying ComEd supply product for the life of the battery, while Ameren's virtual power plant enrollment doesn't change your supply. The $300/kW and $300/kWh rebate amounts match, and in both territories the storage rebate requires the battery to be paired with on-site solar.

Possibly — it's offer-specific and dated. Providers whose projects began construction by July 4, 2026 generally have through 2030 to place systems in service; projects started later must be in service by December 31, 2027 under stricter equipment-sourcing rules. Battery storage kept a longer federal timeline. The practical move: ask any lease or PPA provider whether their offer still qualifies, and how that value shows up in your payment.

Systems interconnected on or after January 1, 2025 earn supply-only credits: exports offset the supply portion of your bill rather than the full retail rate, and unused credits carry forward to future bills. That rewards right-sizing and self-consumption — using your own power beats exporting it — which is also why pairing solar with a battery has become more valuable in Illinois.

On ComEd's optional Hourly Pricing plan, the mechanics genuinely allow it. Export credits are calculated as a dollar value at the hourly market price and applied against the cost of your bill — the whole bill, not just the supply line — and when credits exceed the bill, the excess rolls to the next cycle. Credits don't expire for Hourly Pricing participants. The conditions matter: you enroll in Hourly Pricing, the system is sized and timed right, and it's ComEd-only — Ameren has no equivalent, and ComEd's standard fixed-price rate stays supply-only for systems interconnected since 2025. It's rolling bill credit, not a cash payout. The full mechanism, with a documented $0-bill month and the counterexample →

No — despite what many national guides claim, Illinois has no residential sales-tax exemption for solar equipment. The real Illinois tax break is different: a property-tax special assessment under 35 ILCS 200/10-10 that keeps your system's value from raising your property-tax bill, claimed with a one-time PTAX-330 filing.

They shouldn't — but it's not automatic. Illinois law treats a home solar system as a special assessment under 35 ILCS 200/10-10, so the system's value is excluded from your assessment, provided you file a one-time Form PTAX-330 with your county assessor. File it once and the protection holds.

You don't apply to the state directly — your installer does. Illinois Shines flows through registered Approved Vendors and their Designees, who submit your project into the program, and the state requires a standard Disclosure Form before you sign so the REC value and terms are in writing. Your job is choosing a state-approved vendor and verifying the REC value is reflected in your price.

There is no single honest answer, because the largest incentive never appears as a line item. Illinois' own agency, the IPA, models residential solar at $3.73 per DC watt in ComEd territory and $3.66 in Ameren territory for 2026 — roughly 20% above what national comparison sites publish. From that, the $300/kW rebate comes off directly and the REC value comes off indirectly through your vendor's pricing. What you should compare between quotes is dollars per watt, not the headline total. We publish the sourced state figures rather than a made-up average. If you're financing, also check whether a dealer fee is inflating the loan price — why a solar loan can cost more than the cash price →

No program gives market-rate homeowners free panels. What "free solar" and "$0 down" usually describe is a lease or a solar power agreement (PPA): the provider owns the system, you pay nothing upfront, and instead of buying it you pay a set monthly amount (a lease) or a set rate for each kWh it produces (a PPA). A separate income-qualified state program exists for eligible lower-income households, with its own rules and protections. For everyone else, Illinois' incentives lower the cost of solar, whether you buy the system or choose a lease or PPA.

For the 2026–27 Illinois Shines program year that opened June 1, 2026, small systems (10 kW AC and under) earn $80.77 per REC in ComEd territory and $70.37 in Ameren territory, plus the $20/REC customer-owned adder where it applies. Systems over 10 kW AC and up to 25 kW AC earn $79.21 (ComEd) and $60.92 (Ameren). These are fixed program prices — not a trading market — and the value flows through your state-approved installer.

AC. Illinois Shines sets its small-system tiers in kW AC — the inverter's rated output — not the DC panel rating that most quotes headline. For the 2026–27 program year, systems 10 kW AC and under earn $80.77 per REC in ComEd territory and $70.37 in Ameren territory; systems over 10 kW AC and up to 25 kW AC earn $79.21 and $60.92. Because panel DC ratings typically run above the inverter's AC rating, a system quoted at 11 kW DC can still fall inside the 10 kW AC tier — so ask your vendor which figure the REC value in your quote was priced on.

Partly, and with strings. The utility rebate pays $300 per kWh of installed storage. In both territories the battery must be paired with solar, and taking the rebate commits you to your utility's virtual power plant — five years plus life-of-battery on a Qualifying Utility Product in ComEd territory (Rate BESH is one option), and VPP enrollment in Ameren territory. From 2027, ComEd's virtual power plant pays enrolled batteries $10 per kW-Season under a tariff that took effect July 16, 2026; Ameren's Rider SD VPP pays $10.00 per kW of seasonal performance. Since September 14, 2026, ComEd also lets a solar-paired battery charge from the grid as well as the panels. Illinois Shines itself is solar-only. Supply-only net metering also quietly favors batteries: storing your own power beats exporting it at supply-only credit rates.

Not the way scarcity pitches imply. The program releases capacity in fresh annual blocks — the 2026–27 year opened June 1, 2026 — and it's funded through charges on Illinois utility bills, with waitlisted projects rolling into the next program year. So "act before the money's gone" is a sales line, not how the program works. Current block status is published on the official Illinois Shines site.

No. October 1, 2026 is when ComEd and Ameren reset their supply prices — the price to compare — not when any incentive changes. From that date, ComEd's price is 10.103¢ per kWh and Ameren's is 10.441¢ for the first 800 kWh a month and 8.262¢ beyond, both through May 2027. Illinois Shines REC prices are fixed for the program year that runs through May 31, 2027; the $300/kW and $300/kWh rebates, the supply-only net-metering rule, and the property-tax special assessment are all unaffected. What the reset changes is the value of the power your system replaces, which is why the calculator on this page dates its rate figures. What the October 1 reset actually changes →