How much do solar panels cost in Illinois?

In Illinois, solar panel installation averages about $2.82 per watt. For a typical $150 monthly electric bill, a 6.9 kW system (18 panels) costs approximately $20,304 before incentives, or $14,213 after the 30% federal tax credit.

Is solar worth it in Illinois?

Yes — with 4.51 peak sun hours per day and 20.5¢/kWh electricity rates, solar in Illinois typically pays for itself in 7.6 years. The rating is Strong.

Solar Panel Cost & Savings in Illinois (2026)

Quick Illinois Solar Facts

4.51

Peak Sun Hours/Day

20.5¢

Electricity Rate

$2.82

Install Cost/Watt

7.6 yrs

Avg Payback

In Illinois, a typical 6.9 kW system (18 panels) costs approximately $14,213 after the 30% federal tax credit. With 4.51 peak sun hours per day and 20.5¢/kWh electricity rates, annual savings average $1,868 with a payback period of 7.6 years. Rating: Strong. Source: NREL PVWatts v8 (PSH), US EIA July 2026 (rates), SEIA/EnergySage Q1 2026 (costs).

☀️ Calculate Your Illinois Solar Savings →

How many solar panels do I need in Illinois?

For a typical home with a $150 monthly electric bill in Illinois, you need about 18 panels (7.2 kW system). Your exact number depends on your specific monthly usage and roof orientation.

What solar incentives are available in Illinois?

Every US homeowner qualifies for the 30% federal Investment Tax Credit (ITC) through 2032. Many states also offer additional incentives — check our main calculator's Incentives tab for Illinois-specific rebates, tax credits, and net metering policies.

Is Illinois a good state for solar?

Illinois has 4.51 peak sun hours per day (U.S. average: 4.98). With electricity at 20.5¢/kWh (U.S. average: 18.83¢/kWh), solar in Illinois typically pays for itself in 7.6 years. Overall rating: Strong.