Cost of solar in Illinois: what it really costs in 2026
Illinois solar costs $2.80–$3.30/watt. Here is the full honest breakdown: gross price, every available incentive, and realistic payback math at current ComEd rates.
Illinois solar costs are competitive: $2.80 to $3.30/watt, with a mature installer market in the Chicago metro driving prices down. When you stack Illinois Shines SREC income on top of ComEd net metering, the effective payback picture is significantly better than the gross price suggests.
System sizes and costs
- 6 kW: $16,800–$19,800. Produces ~7,500–8,500 kWh/year in Illinois.
- 8 kW: $22,400–$26,400. Most common size. Produces ~10,000–11,500 kWh/year.
- 10 kW: $28,000–$33,000. For larger homes or EV charging.
Payback math with Illinois Shines
An 8 kW system in the Chicago area producing 11,000 kWh/year at ComEd’s $0.19/kWh rate earns $2,090/year in net metering savings. Add Illinois Shines SREC income (amount varies by current block; ask your installer for current value) — at historical rates of $60–$100/MWh, an 11,000 kWh system earns $660–$1,100/year in SREC income. Combined annual savings: $2,750–$3,190. Net system cost after sales tax exemption: ~$23,500. Payback: approximately 7–9 years.