Solar Panels in Illinois (2026 Guide)

Q: How much do solar panels cost in Illinois in 2026?

About $2.90 per watt — roughly $14,500 for a 5 kW system and $29,000 for a 10 kW system, before incentives.

Q: What is Illinois Shines?

Illinois Shines (the Adjustable Block Program) pays your SREC value UP FRONT based on 15 years of estimated production — recently about $72–$85 per REC, often $9,000–$10,500 total for a 7 kW system. It is an SREC incentive, not an income tax credit, and block rates decline as capacity fills.

Q: Does Illinois have net metering?

It changed. Systems interconnected on or after January 1, 2025 get 'supply-only' net metering (credits cover the supply portion of exports, not delivery). Systems operational before that date are grandfathered into full net metering.

Q: Is solar worth it in Illinois?

It can be — the upfront Illinois Shines payment plus utility rebates significantly cut net cost — but the Jan 2025 shift to supply-only net metering reduced export value, and Illinois Shines block rates decline, so acting sooner helps.

Illinois has a distinctive incentive: Illinois Shines pays your SREC value up front, which can knock thousands off your net cost. But two things make timing matter — net metering shifted to "supply-only" for systems connected on or after January 1, 2025, and Illinois Shines block rates decline as capacity fills.

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How Much Do Solar Panels Cost in Illinois?

Illinois averages about $2.90 per watt before incentives:

5 kW system: ~$14,500
7 kW system: ~$20,300
10 kW system: ~$29,000

See our 2026 cost breakdown.

Illinois Solar Incentives in 2026

Illinois Shines (upfront SREC payment) — the headline

Through Illinois Shines / the Adjustable Block Program (ABP), you're paid your SREC value up front, based on ~15 years of estimated production — recently about $72–$85 per REC, often $9,000–$10,500 total for a 7 kW system. Note: this is an SREC incentive, not a state income tax credit, and block rates step down as capacity fills.

Utility rebate

ComEd and Ameren offer a $300/kW upfront rebate (about $1,500 for 5 kW, $3,000 for 10 kW).

Property tax exemption

Illinois offers a solar property tax special assessment — file form PTAX-330 with your county assessor (not automatic everywhere).

No sales tax exemption; no federal credit in 2026

Illinois has no statewide solar sales tax exemption, and the 30% federal residential credit expired December 31, 2025. See our 2026 tax credit guide and incentives guide.

Net Metering in Illinois — What Changed

For systems interconnected on or after January 1, 2025, Illinois moved to "supply-only" net metering — credits cover only the supply portion of your exports, not delivery charges, so each exported kWh is worth less than before. Systems operational before that date are grandfathered into full net metering for the system's life (ComEd, Ameren, MidAmerican).

Is Solar Worth It in Illinois?

It can be — the upfront Illinois Shines payment plus the utility rebate substantially cut your net cost. The trade-off is the reduced (supply-only) export value and declining block rates, which is exactly why acting sooner tends to pencil out better. A custom quote shows your real numbers.

Frequently Asked Questions

How much do solar panels cost in Illinois in 2026?
About $2.90 per watt — ~$14,500 for 5 kW, $29,000 for 10 kW.

What is Illinois Shines?
An upfront SREC payment (~$72–$85/REC; ~$9,000–$10,500 for 7 kW) — not a tax credit.

Does Illinois have net metering?
Supply-only for systems connected on/after Jan 1, 2025; earlier systems grandfathered into full net metering.

Is solar worth it in Illinois?
Often yes thanks to Illinois Shines + rebates; sooner is better as rates step down.

Sources

Illinois Shines & net metering: Illinois Shines, SolarReviews. Property tax: LegalClarity. Incentives: EnergySage. Federal credit expiration: IRS OBBB FAQ.