Illinois has one of the most financially compelling solar incentive packages in the country — and also one of the most confusing. The state’s SREC program, called Illinois Shines, has a history of opening enrollment, running out of funding, closing, reopening, and changing terms. If you’ve looked into Illinois solar before and found the information contradictory, it’s because the program actually has been contradictory.
Here’s the current picture, with the important caveat that Illinois incentive programs move faster than blog posts can keep up with. Verify current Illinois Shines availability directly before making any decisions.
The Illinois SREC: What It Is and What It’s Worth
A Solar Renewable Energy Credit (SREC) represents the environmental attributes of one megawatt-hour (1,000 kWh) of solar production. Illinois utilities are required to purchase a certain amount of renewable energy — and they buy SRECs from solar owners to meet that requirement.
Through Illinois Shines, residential solar owners can sell SRECs through an Approved Vendor for a fixed price over a 15-year contract — meaning you lock in a price per SREC at the time of enrollment and receive that payment for 15 years as your system produces.
SREC values in Illinois have historically run $60–$75 per SREC (per MWh of production) for residential systems. A 9kW system in Chicago producing roughly 10,000 kWh per year generates approximately 10 SRECs per year — worth $600–$750 annually under those rates.
Over 15 years at $65/SREC: approximately $9,750 in additional income on top of electricity savings. That’s meaningful money that significantly changes the payback calculation.
Check current SREC values and Illinois Shines program status at illinoisshines.com — values and availability change.
Illinois’ Other Incentives
Federal 30% ITC: Same as every state.
Property tax exemption: Illinois exempts solar installations from property tax assessment for 20 years after installation.
Sales tax exemption: Illinois exempts solar energy systems from the state’s 6.25% sales tax.
Net metering: Illinois requires investor-owned utilities (ComEd, Ameren) to offer full retail net metering for residential customers. Monthly excess credits roll forward; annual excess is credited at the avoided cost rate.
The Chicago Production Reality
Chicago’s solar resource is modest — approximately 4.1 peak sun hours per day, similar to Boston. The latitude and Lake Michigan weather patterns produce more clouds and less direct sun than Sun Belt markets.
A 9kW system in Chicago produces approximately 10,000–11,000 kWh per year, compared to 14,000–15,000 in Austin. But Chicago electricity rates from ComEd average $0.14–$0.16/kWh blended — higher than Texas — which partially compensates for lower production.
The Illinois SREC income is the factor that makes Chicago solar competitive with Sun Belt markets despite lower production. Strip out the SREC and Chicago payback is 10–12 years. Include 15 years of SREC income at current rates and payback compresses to 7–9 years.
What to Watch Out For
Illinois Shines program capacity: The program has enrollment caps. When the cap is reached, new applicants go on a waitlist. Your installer should check current enrollment status before you sign a contract — the SREC income is a major part of Illinois solar economics, and a system designed around SREC income that can’t get enrolled is a different investment than one that can.
Approved Vendor requirement: SREC sales in Illinois Shines must go through an Approved Vendor — you can’t sell directly. Your installer typically handles this as part of the installation package, but ask specifically whether they’re an Approved Vendor or work with one, and what fees they charge.
ComEd interconnection timeline: The permitting and interconnection process in the Chicago area has historically been slower than some markets — build 3–5 months into your timeline expectation.
Illinois is genuinely one of the best states for solar when the SREC program is open and funded. The complexity is manageable. The economics are real.
— Allen
