Renewable Energy Permitting in Illinois
Illinois offers retail electricity choice, full retail rate net metering through ComEd and Ameren, and the Adjustable Block Program for solar incentives.
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Key Permitting Highlights in Illinois
Full retail rate net metering (ComEd)
Adjustable Block Program incentives
Retail electricity choice
Systems up to 2 MW eligible
Overview
Illinois operates a retail electricity choice market through ComEd, Ameren Illinois, and MidAmerican Energy territories. The state's Adjustable Block Program provides declining block incentives for solar installations. ComEd offers full retail rate 1:1 net metering, while Ameren provides time-of-use based energy credits. The Climate and Equitable Jobs Act (CEJA) has strengthened the state's renewable energy commitments.
Permitting Guide
Common Challenges & Landmines
Local moratoria + ordinance churn (solar setbacks, BESS bans, decommissioning bonds) are usually the #1 surprise cost. Stormwater + erosion compliance (CGP/SWPPP) enforcement risk + stop-work exposure. Wetlands/401/404 + floodplain can be route/site killers—plan alternatives early. BESS fire code adoption + AHJ posture: IFC/NFPA 855/UL 9540A documentation expectations vary by locality.
Tax Considerations
Property tax is commonly local and negotiable; incentives are often deal-specific.
Data Center Considerations
Incentives vary widely and often include sales/use exemptions and sometimes property tax relief.
Net Metering & Utilities
ComEd provides full retail rate net metering—every kWh exported receives equal credit. Systems can be up to 2 MW but should be sized to meet 80-90% of household demand. Ameren offers time-of-use energy component rates ranging from 3.64¢ to 5.79¢/kWh depending on season and peak period. Non-residential customers receive credits based on avoided supply costs rather than full retail.
Interconnection Process
Both ComEd and Ameren have defined interconnection processes with online application portals. The process includes application submission, engineering review, interconnection agreement execution, and permission to operate. Timeline varies by system size and complexity, typically 4-8 weeks for standard residential installations.
Adjustable Block Program
The Illinois Adjustable Block Program provides capacity-based incentives that decline as blocks fill. Credits are tracked through the ABP and vary by utility territory, system size, and project type. The program supports both distributed generation and community solar development throughout the state.
Frequently Asked Questions
How does retail choice work in Illinois?
Customers in ComEd, Ameren, and MidAmerican territories can choose who provides their electricity supply. Options include utility default service, Alternative Retail Electric Suppliers (ARES), municipal aggregation, and hourly pricing programs. Utilities remain regulated while ARES rates are unregulated.
What net metering credits can I expect?
ComEd customers receive 1:1 full retail rate credits. Ameren customers receive time-varying energy component credits (3.64-5.79¢/kWh). Non-residential customers across utilities typically receive lower credits based on avoided supply costs rather than full retail rates.
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