Illinois Solar Rights: What Changed for Municipal and Co-op Customers

Illinois solar rules are not identical for every household. A homeowner served by ComEd, Ameren Illinois, or MidAmerican may encounter a different legal and regulatory structure than a customer of a city-owned electric utility or a rural electric cooperative. That provider distinction is the starting point for understanding the solar-rights changes that took effect in 2026.

Public Act 104-0458 took effect June 1, 2026. It added two narrow protections for residential and small-commercial customers of Illinois municipal electric systems and electric cooperatives: the right to interconnect qualifying renewable systems sized up to and including 25 kW AC, and limits on customer insurance requirements when specified safety and contractor conditions are met.

What changed on June 1, 2026

The Clean and Reliable Grid Affordability Act, known as CRGA, became Public Act 104-0458 after the governor signed it on January 8, 2026. The Illinois Power Agency identifies June 1, 2026 as the law's effective date. The large act covers many energy topics, but two amendments are especially relevant to customers who want to generate renewable electricity in municipal-utility and electric-cooperative territories.

First, the customer-rights section now expressly includes a right for residential and small-commercial customers to interconnect renewable systems sized up to and including 25 kilowatts of alternating-current output. Second, qualifying customers cannot be required to name the municipal system or cooperative as an additional insured or carry a customer minimum liability limit when the statutory safety and contractor conditions are satisfied.

Who the new protections cover

These particular provisions govern municipal electric systems and electric cooperatives. They matter because those providers are not automatically subject to every rule that applies to large investor-owned utilities. An Illinois mailing address alone does not identify the applicable solar policy. The actual company or public entity delivering electricity to the property does.

• If the bill identifies ComEd, Ameren Illinois, or MidAmerican as the delivery utility, verify the current tariff and Illinois Commerce Commission rules that apply to that account.
• If the bill comes from a city, village, municipal electric department, or rural electric cooperative, request that provider's current self-generation and interconnection policy.
• Do not rely on a salesperson's general statement that Illinois has one statewide solar-credit rate or one identical approval process for every utility.

What the 25 kW sizing right means

The amended statute says residential and small-commercial customers have a right to interconnect renewable energy systems sized up to and including 25 kW AC. This can prevent a municipal utility or cooperative from using a lower blanket size ceiling that keeps an otherwise suitable customer from proposing a system sized to the property's electricity needs.

The number is a ceiling for the protected sizing right, not a recommendation that a home needs a 25 kW system. It also is not automatic permission to energize a project. The law preserves written notice, worker-safety requirements, applicable State and local safety and electrical codes, and the provider's interconnection review. Roof area, electrical equipment, annual usage, shading, contract economics, and local requirements still matter.

A legal right to propose or interconnect a system up to 25 kW does not guarantee a particular bill reduction, excess-energy credit, incentive, interconnection cost, or approval timeline.

How the insurance requirement changed

Municipal systems and electric cooperatives may not require a qualifying customer to name the provider as an additional insured or impose a minimum customer liability limit when the renewable generating facility meets the safety standards in the applicable interconnection agreement and the installer is licensed and carries the contractor coverage specified by law.

The enacted text specifies commercial general liability coverage for the contractor of at least $1 million per occurrence and $2 million in the aggregate per year. That is a contractor condition in the statutory exception. It should not be paraphrased as a general promise that no insurance documentation will ever be requested or that a customer's homeowner policy will cover every solar-related loss.

What the law did not standardize

Illinois did not turn every proposal described as a Solar Bill of Rights into current law. Public Act 104-0458 itself says municipal and cooperative policies on self-generation and credits may reasonably differ from requirements imposed on other entities. The statute states that credits must recognize the value of self-generation and benefits to other customers, but it does not establish one identical statewide cents-per-kilowatt-hour rate for every municipal system and cooperative.

Advocates are seeking additional protections involving publication of crediting policies, longer stability for existing arrangements, access to leases and power purchase agreements, proportionate meter and engineering-study costs, a mediation path, and clearer interconnection fees and timelines. Those are policy proposals and advocacy priorities. Homeowners should not treat them as enacted rights unless the General Assembly passes additional legislation.

• The law does not guarantee that excess generation will receive the same credit in every utility territory.
• The law does not freeze every existing solar compensation policy for 25 years.
• The law does not require every municipal utility or cooperative to accept every lease or power purchase agreement.
• The law does not create a general Illinois Commerce Commission mediation program for all municipal and cooperative solar disputes.
• The law does not erase reasonable safety review, interconnection requirements, meter work, or project-specific costs.

What to check before signing a solar agreement

1. Identify the delivery utility from the electric bill and determine whether it is investor-owned, municipal, or cooperative.
2. Obtain the provider's current written interconnection, self-generation, system-size, insurance, fee, and excess-energy credit policies.
3. Ask for both DC panel capacity and AC inverter output. The new statutory sizing language uses AC output.
4. Confirm the installer's Illinois licensing status and request evidence of the contractor insurance required by the provider and applicable law.
5. Compare the sales proposal's savings assumptions with the provider's actual credit rate, fixed charges, meter costs, study costs, and expected approval timeline.
6. For an Illinois Shines project, review the program disclosure form, Approved Vendor identity, REC arrangement, financing structure, and current consumer-protection materials before signing.
7. Keep the proposal, signed agreement, disclosure form, utility policy, interconnection application, approval, bills, advertisements, and messages together.

What this means for an existing solar agreement

The June 2026 changes do not automatically rewrite a solar loan, lease, power purchase agreement, installation contract, warranty, or savings guarantee. They also do not by themselves determine whether a utility applied the correct credit or whether a provider's earlier policy remains enforceable. Those questions depend on the agreement, utility type, interconnection history, applicable policy, and facts of the account.

If a salesperson, installer, or utility relies on the new law to explain a changed price, system size, insurance demand, interconnection charge, or credit rate, preserve that explanation in writing and compare it with the governing documents. Solar Exit can help organize the record and review the practical questions in an Illinois solar situation. We are not a law firm and do not provide legal, tax, insurance, engineering, or electrical advice.

Illinois solar rights FAQs

Does the 25 kW rule give every Illinois homeowner the same utility policy?

No. The new language supplies a specific sizing protection for residential and small-commercial customers of municipal systems and electric cooperatives. Other rules, tariffs, technical requirements, and compensation structures still depend on the utility and project.

Does a system at or below 25 kW receive automatic approval?

No. The statute preserves written notice, applicable safety and electrical-code requirements, worker-safety measures, and an interconnection process. The system and application still must satisfy the requirements that lawfully apply.

Does the law guarantee a particular excess-energy credit?

No. Municipal and cooperative policies may reasonably differ. Customers should obtain the current written crediting policy and use its actual rates, fees, and terms when evaluating a savings estimate.

Did Illinois enact the entire proposed Solar Bill of Rights?

No. Two protections were included in Public Act 104-0458. Other items discussed by advocates remain proposals unless enacted through later legislation.