Solar Panel Cost in Joliet, IL
Updated 2026 guide to solar panel prices, savings, and payback period in Joliet.
Estimated Solar Savings
Solar Panel System Costs in Joliet, IL
Below are estimated costs for different solar panel system sizes in Joliet, including the 30% federal solar tax credit.
| System Size | Cost Before Incentives | Federal Tax Credit (30%) | Net Cost | Est. Annual Production |
|---|---|---|---|---|
| 4 kW | $12,200 | -$3,660 | $8,540 | 5,840 kWh |
| 6 kWMost Popular | $18,300 | -$5,490 | $12,810 | 8,760 kWh |
| 8 kW | $24,400 | -$7,320 | $17,080 | 11,680 kWh |
| 10 kW | $30,500 | -$9,150 | $21,350 | 14,600 kWh |
| 12 kW | $36,600 | -$10,980 | $25,620 | 17,520 kWh |
What Affects Solar Panel Cost in Joliet?
The average cost of solar panels in Joliet, IL is approximately $305/watt before incentives. For a typical 6kW residential system, that means a total cost of about $18,300 before the federal tax credit.
After applying the 30% federal Investment Tax Credit (ITC), your net cost drops to approximately $12,810.Joliet homeowners typically see a payback period of 7 years and save an estimated $35,000 over 25 years.
Factors that affect your cost in Joliet:
- System size: Larger systems cost more but have a lower cost per watt
- Equipment quality: Premium panels and inverters cost more but offer better efficiency
- Roof complexity: Steep roofs, multiple levels, or shading can increase installation costs
- Local labor rates: Installation costs vary within the Joliet metro area
- Local permits: Permitting costs and requirements vary by municipality in Joliet
- Incentives: State and local programs can significantly reduce your out-of-pocket cost
Solar Incentives Available in Joliet
Federal Solar Investment Tax Credit
30% Federal Tax Credit (ITC)
Illinois homeowners can combine the 30% federal ITC with the state's excellent SREC program for maximum solar savings.
State & Local Incentives
Illinois Shines (Adjustable Block Program)
SRECIllinois Shines provides upfront payments for solar renewable energy credits from residential solar installations.
Illinois Solar for All
RebateProvides solar access to low-income households, nonprofits, and public facilities at no cost to participants.
Sales Tax Exemption
Sales TaxSolar energy systems qualify for a reduced state sales tax rate in Illinois.
Property Tax Special Assessment
Property TaxSolar energy systems receive favorable property tax treatment, with the added value assessed at a fraction of market value.
Net Metering
Illinois offers net metering for residential solar systems. ComEd and Ameren Illinois customers can receive full retail rate credits for excess generation.
AvailableSRECs
Illinois has one of the strongest SREC markets through the Illinois Shines program. Solar owners receive 15-year contracts for their renewable energy credits.
Est. Value: $60-$90 per REC
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Solar Panel Cost FAQ - Joliet, IL
The average cost of solar panels in Joliet is approximately $3.05 per watt before incentives. A typical 6kW residential system costs about $18,300 before the 30% federal tax credit, bringing the net cost to around $12,810.
The typical payback period for solar panels in Joliet is approximately 7 years. After that, you'll enjoy free electricity for the remaining 15-20+ years of your system's life, saving an estimated $35,000 over 25 years.
Joliet homeowners can take advantage of the 30% federal solar tax credit, which reduces your system cost by 30%. Illinois also offers net metering, SRECs, and various state-level incentive programs. Check our incentives page for the complete list.
Joliet homeowners can save an estimated $35,000 over 25 years by going solar. Actual savings depend on your electricity usage, system size, roof orientation, and available incentives. With electricity rates averaging $0.16/kWh in Illinois, solar provides significant long-term savings.
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