Cost of Solar in Illinois

Illinois Solar Pricing Overview

Illinois has emerged as a solar powerhouse in the Midwest. The gross cost of a solar installation in Illinois generally aligns with the national average, falling between $2.70 and $3.30 per watt before incentives. A standard 6 kW system typically costs between $16,200 and $19,800 gross.

However, what makes Illinois unique is not the upfront price—it is the aggressive, state-mandated incentive structure that drastically reduces the net cost of a system.

The Illinois Shines Program (Adjustable Block Program)

The financial math of going solar in Illinois is fundamentally altered by the state's Renewable Portfolio Standard (RPS), which requires utility companies (like ComEd and Ameren) to source a percentage of their power from renewable energy.

Through the Illinois Shines program, homeowners generate Solar Renewable Energy Credits (SRECs). For every 1,000 kWh of clean electricity your system produces, you generate one REC.

How the REC Payment Works

Instead of you having to sell these credits on an open market year by year, the Illinois Shines program allows your "Approved Vendor" to bundle 15 years' worth of your estimated RECs and sell them upfront to the utility.

This results in a massive lump-sum payment (often thousands of dollars) that is typically passed on to you shortly after the system is energized, or it is used by the installer to immediately lower the contract price of your system.

Stacking the Savings

When you combine the Illinois Shines REC payment with the 30% Federal Investment Tax Credit (ITC), the net cost of a solar system in Illinois can drop by 40% to 60%.

• Federal ITC: Reduces your federal tax liability by 30% of the gross system cost.
• Illinois Shines RECs: Provides a cash block or upfront discount based on your system's projected 15-year production.
• Net Metering: Illinois still maintains favorable 1:1 net metering (though policies are shifting). This means the utility credits you at the full retail rate for excess power you send to the grid.

Illinois Solar for All

For low-income households and residents of environmental justice communities, the state offers the Illinois Solar for All program. This program guarantees that participants will see no upfront costs and immediate, guaranteed savings on their utility bills, making solar accessible to everyone.

Important Considerations

Because the Illinois Shines program is so lucrative, the market is highly competitive. It is crucial to confirm that your installer is an official "Approved Vendor" (or partnered with one) in the Illinois Shines program, as you cannot receive REC payments otherwise.