Solar Panels Cost $7.6k-$17k in Marion County, IL | August, 2025

Renewable energy and distributed generation customers in Illinois may enter net metering or "dual metering" arrangements with their utility. By using their generation system, customers generate renewable energy credits. By law, they hold ownership of the RECs they generate, but they may choose to sell them to the utility upon signing a net metering contract. Dual metering is for property types in a "competitive class". Utilities should install a dual-channel meter to measure net excess generation (NEG) sent back to the grid. The customer will receive a bill credit for monthly NEG at a variable rate. Net metering operates in a similar fashion, but uses a single bidirectional meter and is designed for residential and certain commercial properties (these are "non-competitive classes".) Additional information is available from the Illinois Department of Energy.

Illinois has adopted various state standards for distributed generation and interconnection using systems rated for less than 10 MW. Regulations are amended and enforced by the Illinois Commerce Commission (ICC). Each connected generation system is sorted into one of four tiers based on capacity. Which tier a system falls into determines engineering standards, permit processes, and the minimum liability insurance coverage that the system's owner must carry. Distributed generation for systems over 10 MW is also standardized under a different set of rules. Additional information is available from the ICC website.

The Illinois legislature enacted the state's first renewable portfolio standard in 2007 and established the Illinois Power Agency for its enforcement. The current standard requires 25% of the state's renewable energy to come from renewable sources by 2026, with 6% coming from solar installations, 75% from wind turbines, and 1% from distributed generation systems. Compliance is measured using a renewable energy credit (REC) system pegging electric capacity to an adjusted dollar value. Utilities in the state must obtain these credits through their own generation activities or by purchasing them from distributed generation customers.

New government buildings or renovation projects in Illinois should comply with certain green building standards. Any new occupied state building or renovation affecting a maximum of 10,000 square feet should meet the highest feasible LEED standard, though the state does not need to apply for formal LEED certification. New buildings or renovation projects over 10,000 square feet must meet LEED Silver standards and apply for formal certification. A project may be exempt if costs toward meeting green building standards exceed benefits. Historic buildings may carry an exemption by default if improvements would negatively affect their aesthetics or status. Additional information is available from the Illinois Department of Commerce website.

Residential, commercial, and wholesale customers of the Illinois Municipal Electric Agency may be eligible for a variety of financial incentives on energy efficiency equipment and projects. Eligible items and services will change from time to time. Current programs include rebate offers on HVAC, lighting, motors, and generation equipment. For each of these projects, the rebate amount averages at 7 cents per saved kilowatt hour for the first year of the improvements' deployment. The application process involves project reviews. Customers should submit copies of the city permits they have obtained for their proposed projects. To ensure accountability, IMEA requires the submission of receipts and a final inspection upon completion of the project. Additional information is available from the IMEA website.

The Illinois Power Agency is a legislative organization that aids several private electrical utilities (Commonwealth Edison and Ameren, specifically) in purchasing renewable energy credits, including credits designated exclusively for solar energy. To meet renewable portfolio standards, the IPA acts as a diplomatic middleman to create purchasing agreements between utilities. As IPA both designs and operates procurement programs using a variety of tracking systems, customers participating in arrangements such as net metering may interface directly with the IPA. Additional information is available from the agency website.