The best solar installers in Illinois
Our top picks below are local installers we re-verified in October 2026 — each has a verified website or Google business listing (use the Google listing for current phone numbers and hours). For other regions of the state and additional alternatives, see the Honorable mentions below.
Certasun Local
Why listed: 4.7-star Google rating from 335 reviews on an owner-verified Google business listing, with a working website (checked October 2026).
Windfree Solar Local
Why listed: 4.6-star Google rating from 117 reviews on an owner-verified Google business listing, with a working website (checked October 2026).
Stateline Solar Local
Why listed: 4.8-star Google rating from 43 reviews on an owner-verified Google business listing, with a working website (checked October 2026).
Route 66 Solar Local
Why listed: 4.8-star Google rating from 122 reviews on an owner-verified Google business listing, with a working website (checked October 2026).
National installers National
Sunrun, Tesla Energy, and Palmetto Solar are the major national installers still actively taking new Illinois residential contracts as of 2026. Palmetto Solar currently holds EnergySage's Elite+ tier — the platform's highest installer rating. National installers typically have larger sales footprints but also higher financing markup and more variable local service quality than the IL-based installers above.
Avoid — recently bankrupt or exited: Sunnova (Chapter 11 June 2025), the original SunPower (Chapter 11 August 2024 — the current "SunPower Inc." is rebranded Complete Solaria, a separate company), ADT Solar (exited residential solar January 2024 — warranty service only), Trinity Solar (East Coast only, doesn't serve Illinois), and Freedom Forever (Chapter 11 April 2026, converted to Chapter 7 liquidation August 2026). If a salesperson contacts you under any of these brand names, ask which legal entity is actually signing the contract and warranty.
For the complete list of national installers with state coverage maps, financing terms, and ratings:
Honorable mentions
Additional installers worth getting a quote from — strong Illinois-based alternatives and EnergySage-screened regional installers that serve Illinois from neighboring states.
Other Illinois-based installers
Kapital Electric Local
Why listed: Working website confirmed October 2026. No Google business listing was found — confirm the contractor license and ask for local references before signing.
Sun Collectors Local
Why listed: 4.9-star Google rating from 312 reviews on an owner-verified Google business listing, with a working website (checked October 2026).
WindSoleil Local
Why listed: 4.9-star Google rating from 67 reviews on an owner-verified Google business listing, with a working website (checked October 2026).
Tick Tock Energy Local
Why listed: 4.8-star Google rating from 20 reviews on an owner-verified Google business listing, with a working website (checked October 2026).
Illinois Shines (formerly Adjustable Block Program) and Illinois Solar for All have specific approved-vendor lists. Cross-check any installer at the Illinois Solar for All Approved Vendor Directory if pursuing those programs. Verify current electrical contractor license at the Illinois Department of Financial and Professional Regulation.
Illinois solar economics in 2026
| Metric | Illinois average |
|---|---|
| Average residential rate | $0.14–$0.18 / kWh |
| Typical 8 kW system cost (cash) | $22,000–$28,000 before incentives |
| Average $/W | $2.75–3.50 |
| Average annual production (kWh per kW) | ~1,200–1,350 kWh/kW/year |
| Net metering structure | Net metering at retail (ComEd, Ameren) — strong for residential |
| Average cash payback | 9–11 years |
For full state-by-state cost comparison see solar cost by state.
Illinois solar incentives and rebates (2026)
Illinois stacks federal credit pathways (commercial Section 48E for businesses and third-party-owned residential), state-level credits/rebates where applicable, statutory tax exemptions, and utility-specific programs. Below is the 2026 picture with links to authoritative sources.
Federal credits (2026)
- Commercial Section 48E (Clean Electricity Investment Credit): Available to businesses, farms, and to third-party owners in lease/PPA structures (which can pass the benefit through as lower monthly payments). FEOC restrictions apply — see FEOC rules guide and FEOC compliant parts list. IRS — Clean Electricity Investment Credit.
- USDA REAP grants (agricultural / rural small business): Up to 50% of project cost, with low-interest loan guarantees on top. Quarterly application windows. "Before you build" rules — you must apply before construction starts. USDA — REAP Program.
- Federal 30C EV Charger Tax Credit: Up to 30% of eligible EV charging equipment + installation costs at qualifying locations. Expires for property placed in service after June 30, 2026. IRS — 30C Credit.
Illinois state-level incentives
- Illinois Shines (Adjustable Block Program): Performance-based incentive paid up-front based on a 15-year SREC contract. Block-tier rate steps down by capacity. Strong residential value.
- Property tax exemption: IL Property Tax Code 35 ILCS 200/10 — special assessment ensures solar does not increase property tax.
- Sales tax: IL does not generally exempt residential solar from sales tax.
Net metering & utility programs in Illinois
IL retail-rate NEM with annual netting. See also net metering explained.
- ComEd: NEM + Illinois Shines www.comed.com
- Ameren Illinois: NEM + Illinois Shines www.ameren.com
- Naperville, Springfield CWLP, etc.: Muni rules vary
Illinois SREC market
Illinois Shines pays effective $/MWh up front (block tier varies).
Illinois battery storage incentives
Future Energy Jobs Act has authorized battery incentive structures; verify 2026 ABP block status for storage.
Illinois EV charger and EV-purchase incentives (2026)
- State EV purchase rebate: IL EV Rebate: Up to $4,000 for new EV (verify 2026 funding).
- Federal 30C EV Charger Tax Credit: Up to 30% of eligible equipment + installation in qualifying low-income / non-urban census tracts. Expires June 30, 2026 for property placed in service after that date.
- Many Illinois utilities and cooperatives offer Level 2 EV charger rebates ($150–$800 typical) often tied to TOU enrollment or smart-charger requirements. Check directly with your specific utility.
Authoritative sources to verify before signing
- Illinois Power Agency / Illinois Shines: www.illinoissfa.com
- DSIRE (Database of State Incentives for Renewables & Efficiency): programs.dsireusa.org/system/program?state=IL — searchable national database, kept current by NC State.
- Federal IRS guidance: irs.gov — Clean Electricity Investment Credit
What to verify before signing in Illinois
- Contractor license: Verify with your state contractor licensing authority before signing.
- NABCEP certification: Most reputable installers carry NABCEP-certified installers on staff. Ask which crew member holds the certification.
- Insurance: General liability + workers comp + roofer's insurance separate from electrical insurance.
- References from your county: Permitting and inspection requirements vary. Ask for 2–3 references from your specific county.
- Get at least three bids: Solar bids vary by 20–35% on the same scope of work. See how to compare solar bids.
Got bids from Illinois installers? Compare them properly.
Upload up to four solar proposals from any Illinois installer. The analyzer compares $/W, production estimates, equipment, and financing structure — and tells you which one to sign.
Analyze My Bids →Frequently asked questions about Illinois solar
Does solar make sense in Illinois?
Yes for most homeowners with a $150+ monthly electric bill, an unshaded roof, and 8+ years of expected ownership. Illinois's specific economics are summarized in the table above.
How much does a typical Illinois solar install cost in 2026?
$22,000–$28,000 for an 8 kW system before incentives. Effective net cost depends on your state and utility incentives.
Should I get more than three bids?
Yes — three is a minimum. Four or five is better. Solar bids vary by 20–35% on the same scope of work. See how to compare solar bids.
Are there other reputable Illinois solar installers besides these?
Many. The list above represents installers with strong public profiles in Illinois; reputable installers exist beyond it. Get bids from a mix and compare them objectively rather than relying on any one list.