2026 Illinois Solar ROI & Electric Rate Breakdown by County (18 Counties)
Illinois CEJA Supply Net Metering + Illinois Shines Upfront 15-Year SREC Check ($8,500–$12,500) + $300/kW Inverter & $300/kWh Battery Rebate. Illinois Property Tax Code (35 ILCS 200/10-5) prevents local assessors from increasing home valuation for residential solar installations.
| County | Primary Electric Utility | Avg Rate ($/kWh) | Peak Sun Hours | Est. Yr-1 Savings | Cash Payback | County Teardown |
|---|---|---|---|---|---|---|
| Cook County | ComEd (Commonwealth Edison) | $0.19/kWh | 4.5 hrs/day | $2,321/yr | 11.8 yrs | View Math → |
| DuPage County | ComEd / City of Naperville Electric | $0.19/kWh | 4.5 hrs/day | $2,285/yr | 11.8 yrs | View Math → |
| Lake County | ComEd (Commonwealth Edison) | $0.19/kWh | 4.4 hrs/day | $2,258/yr | 11.8 yrs | View Math → |
| Will County | ComEd (Commonwealth Edison) | $0.19/kWh | 4.5 hrs/day | $2,309/yr | 11.8 yrs | View Math → |
| Kane County | ComEd / City of St. Charles / Geneva Electric | $0.19/kWh | 4.5 hrs/day | $2,273/yr | 11.8 yrs | View Math → |
| McHenry County | ComEd (Commonwealth Edison) | $0.19/kWh | 4.4 hrs/day | $2,258/yr | 11.8 yrs | View Math → |
| Winnebago County | ComEd (Commonwealth Edison) | $0.19/kWh | 4.4 hrs/day | $2,246/yr | 11.8 yrs | View Math → |
| Madison County | Ameren Illinois | $0.19/kWh | 4.7 hrs/day | $2,348/yr | 11.8 yrs | View Math → |
| St. Clair County | Ameren Illinois | $0.19/kWh | 4.7 hrs/day | $2,348/yr | 11.8 yrs | View Math → |
| Champaign County | Ameren Illinois | $0.18/kWh | 4.6 hrs/day | $2,286/yr | 11.8 yrs | View Math → |
| Sangamon County | CWLP (City Water, Light & Power) / Ameren Illinois | $0.17/kWh | 4.6 hrs/day | $2,076/yr | 11.8 yrs | View Math → |
| Peoria County | Ameren Illinois | $0.18/kWh | 4.6 hrs/day | $2,286/yr | 11.8 yrs | View Math → |
| McLean County | Ameren Illinois / Corn Belt Energy | $0.18/kWh | 4.6 hrs/day | $2,274/yr | 11.8 yrs | View Math → |
| Rock Island County | MidAmerican Energy | $0.16/kWh | 4.5 hrs/day | $1,910/yr | 11.8 yrs | View Math → |
| Tazewell County | Ameren Illinois | $0.18/kWh | 4.6 hrs/day | $2,286/yr | 11.8 yrs | View Math → |
| Kendall County | ComEd (Commonwealth Edison) | $0.19/kWh | 4.5 hrs/day | $2,309/yr | 11.8 yrs | View Math → |
| Kankakee County | ComEd (Commonwealth Edison) | $0.19/kWh | 4.5 hrs/day | $2,297/yr | 11.8 yrs | View Math → |
| DeKalb County | ComEd (Commonwealth Edison) | $0.19/kWh | 4.5 hrs/day | $2,297/yr | 11.8 yrs | View Math → |
Recommended Home Battery & Hybrid Inverter Kits for Illinois
Turnkey solar salespeople routinely charge $3.60–$4.80/W by bundling 30% loan dealer fees and $12,000+ battery margins. Buying Tier-1 UL9540 hardware directly—either DIY or hiring a local licensed electrician ($1,500–$2,500)—cuts total cost by 50–65%.
EG4 18kPV Inverter + 14.3kWh PowerPro WallMount
The gold-standard UL9540 all-in-one hybrid system. Pair an 18kW PV input hybrid inverter (200A pass-through) with an indoor/outdoor IP65 14.3kWh LiFePO4 WallMount battery—saving $12,000+ vs turnkey quotes.
- 18kW PV Input / 12kW Continuous AC Output (200A Pass-Through)
- 14.3kWh LiFePO4 (8,000+ cycles @ 80% DoD)
- UL9540 & UL1741-SB Certified for Permit Approval
EcoFlow Delta Pro Ultra (6kWh–30kWh Modular)
Skip the $30,000 contractor quote and 6-month utility interconnection wait. Delivers 7.2kW–21.6kW continuous 120V/240V split-phase output and 5.6kW Solar Input right out of the box—expandable up to 90kWh.
- 7,200W–21,600W 120V/240V Split-Phase Output
- 6.1kWh LFP Stackable Battery (scales to 30kWh–90kWh)
- 5,600W Solar Input — Zero Roof Permit Required for Portable PV
Renogy 48V Off-Grid & Hybrid LFP Solar Kit
Complete modular 48V architecture combining high-efficiency N-type bifacial panels, a 48V 3,500W–5,000W MPPT inverter-charger, and smart modular LiFePO4 storage at ~$1.15/W hardware cost.
- 48V High-Efficiency Bus (75% lower copper wire loss)
- Modular 48V 50Ah / 100Ah Smart LiFePO4 Battery Bank
- Complete Plug-and-Play MPPT All-in-One Controller
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