Illinois Solar Answers

One clear, sourced answer per homeowner question — every figure dated and tied to a public source. New guides added weekly.

Incentives & Programs

Illinois Shines, the utility rebates, and how the money actually flows — who gets paid, when, and in writing.

Full pillar: Illinois Solar Incentives 2026 →

Bills & Net Metering

What exports actually earn now, what pre-2025 systems keep, and the exceptions almost nobody knows exist.

Also read: Why is my ComEd bill so high? →

Buying & Financing

Cash, loan, lease, or PPA — who gets which incentive in 2026, and exactly what to demand in writing before signing.

Solar lease vs. PPA vs. buying, explained →

Also read: Is solar worth it in Illinois? →

Guides launching soon

Your Home & Roof

Roof requirements, shade, HOA rights, hail, and selling a home with solar — the property-side questions.

For now: the Illinois Solar Facts hub →

How this library works

Who we are and how we make money →

How every figure gets sourced and verified →

Found an error? Here's exactly how to report it — and what happens next: Corrections →

Data & Research

The machine-readable backbone — every dated figure, both utilities, one place.

Start here

New to solarIs solar worth it?→Illinois Shines, explained→Lease vs. PPA vs. buying

Worried about my billWhy is my ComEd bill so high?→ComEd net metering→Check my eligibility

Already have a quoteLease vs. PPA vs. buying→Illinois Shines, explained→Battery incentives

Not sure where to start? Start with your address.

Free, about a minute, no obligation — and if rooftop solar isn't the right fit, it says so.

Check my eligibility →

Free eligibility check · ComEd & Ameren · No obligation

The Day Company is an Illinois solar and battery information resource. Information you submit may be used by our review team and authorized partners to contact you about your request. Checking eligibility creates no obligation.