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Case File · Illinois, Statewide Regulatory Regime
Governor JB Pritzker signed HB 4412 into law as Public Act 102-1123 in January 2023. The act amended the Illinois Counties Code (55 ILCS 5/5-12020) to require uniform state-level siting standards for commercial wind and commercial solar. Counties may not impose setbacks more restrictive than the state standard, may not require earthen berms, may not demand developer-funded property-value guarantees, and must hold a public hearing within 45 days of filing and issue a decision within 30 days of the last hearing.
Cited Illinois utility-solar regime read: 72/100 — favorable, with residual county-level political friction but a procedurally tight statutory window.
PA 102-1123
Statute
Jan 2023
Signed
45 days
Hearing Deadline
30 days
Decision Deadline
Yes
Berms Prohibited
Prohibited
Value Guarantees
Illinois Statewide
Pre-2023
Fragmented Illinois siting regime
Before PA 102-1123, Illinois counties and municipalities had broad authority to regulate commercial wind and solar siting through zoning. Several counties imposed prohibitively restrictive setbacks (up to 2,500 feet from residential property lines), earthen berm requirements adding millions to project costs, and developer-funded property-value guarantee demands. Project timelines ran 12–24 months in hostile counties; in some cases, no developer-viable ordinance ever emerged.
January 27, 2023
Governor Pritzker signs HB 4412 into law
Governor JB Pritzker signs House Bill 4412, which becomes Public Act 102-1123. The Illinois Governor's Office press release (January 2023) frames the law as a necessary step to unlock Illinois's share of the federal Inflation Reduction Act solar pipeline. K&L Gates (March 2023) publishes a detailed preemption analysis. The Illinois State's Attorneys Association issues a primary-source brief for county counsels navigating the transition.
2023
County ordinance alignment period
Counties across Illinois work to align local ordinances to state standards. Several counties with pre-2023 restrictive ordinances face the operational question of which provisions survive. State's attorneys offices (Vermilion, Champaign, Piatt, and others) issue guidance that property-value guarantee provisions and earthen-berm requirements cannot be enforced as a condition of special-use-permit approval for qualifying facilities. Developer applications filed under the new regime begin moving through the statutory 75-day hearing + decision window.
2024
First operational cycle under the new regime
The first full-cycle utility solar applications filed under PA 102-1123 proceed to hearing and decision. The 45-day to hearing + 30-day to decision timeline holds in practice for most counties. Where counties attempt to invoke traditional special-use-permit delay tactics, developer counsel cites the statutory deadlines to compel action. A small number of contested cases proceed to administrative review; as of late 2024, no direct appellate-court challenge to the preemption itself had emerged.
2025
Template status and national positioning
Columbia Climate Law Blog and K&L Gates commentators describe PA 102-1123 alongside Michigan PA 233 and New York ORES Article VIII / 94-c as one of three national templates for state-level renewable-siting preemption. Of the three, the Illinois template is the only one without a high-visibility appellate challenge in 2024–2025. Illinois utility solar develops a reputation for procedural stability that outperforms both Michigan (appellate pending) and Ohio (SB 52 county opt-outs multiplying).
The Statute
PA 102-1123
Illinois Public Act 102-1123 (HB 4412) amended 55 ILCS 5/5-12020 — the Illinois Counties Code provision governing commercial wind and solar siting. The act establishes uniform state-level setbacks and technical standards, prohibits local ordinances more restrictive than state standards, prohibits property-value guarantee demands, and prohibits earthen-berm requirements as a condition of SUP approval.
The Clock
45 + 30 Days
Counties must hold a public hearing within 45 days of a complete application filing. Decisions must be issued within 30 days of the last hearing. The statutory clock is a material improvement over the 12–24 month local-zoning timelines that prevailed under the pre-2023 regime in hostile counties.
The Prohibitions
Berms + Value Guarantees
Two specific pre-2023 local-ordinance provisions are explicitly prohibited: (1) earthen berms around commercial solar facilities and (2) developer-funded property-value guarantees for neighboring residential owners. Both had been deal-breakers in specific Illinois counties pre-2023.
The National Frame
Leading Template
PA 102-1123 is recognized by K&L Gates, the Illinois SAA issue brief, and Columbia Climate Law Blog as one of three leading 2023 state-preemption packages (alongside Michigan PA 233 and New York ORES Article VIII / 94-c). Of the three, Illinois is the only one without a high-visibility appellate challenge as of late 2025.
Key Decision Makers & Stakeholders
Governor JB Pritzker
Governor of Illinois
Springfield, IL
Documented Record
Signed HB 4412 into law as PA 102-1123 in January 2023 (Illinois Governor's Office press release). Framed the act within a broader Illinois Climate and Equitable Jobs Act agenda and the state's effort to capture federal Inflation Reduction Act investment flow.
The governor's backing anchors the regime politically. Illinois's partisan composition as of 2025–2026 remains supportive of utility-renewables expansion. A statutory reversal is not politically viable on the current horizon, which gives the regime a durability that Michigan's PA 233 currently lacks.
Illinois General Assembly
State Legislature
Springfield, IL
Documented Record
Passed HB 4412 through both chambers in the 102nd General Assembly. Sponsors included members from both urban and rural districts, which K&L Gates (2023) noted distinguished the Illinois preemption from more politically contested state-preemption efforts.
The bipartisan character of the 2022–2023 passage is a durability signal. Future amendments in a more politically contested General Assembly are possible but not indicated by current signals; developer underwriting can reasonably treat the 2023 statutory framework as stable through the end of the decade.
Illinois State's Attorneys Association
County Legal Guidance
Statewide
Documented Record
Issued a 2023 issue brief (isacoil.org) providing county state's attorneys with guidance on the preemption scope, permissible local conditions, and the procedural implications of the 45-day / 30-day clocks.
The SAA guidance is the operational document for county counsels. Developers navigating specific county applications benefit from citing SAA-aligned language in pre-hearing submittals. Counties with state's attorneys who have internalized the brief generally process applications smoothly; counties where the SAA guidance has been resisted see more procedural friction.
Illinois County Commissioners (mixed)
Local Permitting Authority
102 counties
Documented Record
County postures vary significantly. DeKalb, Champaign, and Vermilion counties have processed multiple post-2023 utility solar applications within statutory deadlines. Other counties — particularly those with pre-2023 restrictive ordinances — have tested the edges of the preemption through creative special-use-permit conditioning.
County-level posture remains a material screening variable even under the preemption. The statute constrains what counties can formally require but does not control political friction during the hearing process. Community risk review coverage of each target county remains valuable.
Utility & Merchant Solar Developers
Active Applicants
Illinois statewide
Documented Record
National developers (Invenergy, AES, EDF, Savion, others) have filed multiple post-2023 Illinois utility solar applications under the 55 ILCS 5/5-12020 framework. Project siting clusters in agriculturally significant central and western Illinois counties with strong solar irradiance and MISO / PJM interconnection access.
Applicants structuring around the Illinois regime typically design to state-level setback standards rather than negotiating county-by-county. The statutory clocks create real timing advantages — particularly relevant for IRA-linked tax-credit deadlines that penalize slow projects.
MISO & PJM (Interconnection Operators)
Regional Transmission Organizations
Illinois territory
Documented Record
Illinois is split between MISO (western / northern Illinois) and PJM (eastern / southern Illinois) interconnection territories. Both RTOs operate FERC-regulated generator interconnection queue processes (FERC Order 2023 cluster studies). Queue timing and deposit requirements are independent of the PA 102-1123 siting framework but are the binding constraint for many Illinois utility-solar projects alongside the siting clocks.
Developers can clear the Illinois siting process in 75 days and still wait multiple years for interconnection. The siting advantage of PA 102-1123 is real but does not substitute for a clean interconnection study. Full screening must combine both variables.
“The preemption that works is the one that nobody bothers to sue.”
The Pre-Filing Research
Before the special-use application filing. Before the interconnection deposit. Before the PPA commitment.
Regime Analysis
PA 102-1123 Utility Solar Regime
Illinois statewide (commercial wind, commercial solar)
Preemption
Siting Clock
Berm Requirement
Property-Value Guarantees
Regime Flag
K&L Gates (2023) and the Illinois State's Attorneys Association issue brief characterize the act as the most developer-favorable utility-renewables preemption of any 2023 state package. Counties may impose local conditions only within state-level standards; they cannot be more restrictive.
Recommendation
PROCEED. Illinois is a favorable utility-solar regime for developers who design to the state-level standards. Confirm interconnection queue posture (MISO / PJM depending on location), evaluate specific county historical posture, and budget for the 75-day statutory window rather than the 12–18 month local-zoning timelines that applied pre-2023.
Pre-PA-102-1123 (2022)
Illinois utility solar before HB 4412 screened poorly in hostile counties with 2,500-ft setbacks, berm requirements, and property-value guarantee demands. A material share of Illinois utility-solar pipeline never reached viable permitting.
Post-PA-102-1123 (current)
Under PA 102-1123, Illinois utility solar screens as one of the most procedurally favorable regimes in the country for developers who design to state-level standards. The remaining friction is interconnection queue timing and residual county-level political posture, not the siting statute itself.
Illinois is the positive case study of state-level renewable-siting preemption. Michigan shows what happens when preemption faces organized rural-township litigation; Ohio shows what happens when the state devolves authority instead of preempting. Illinois shows that tight, developer-designed preemption language with bipartisan sponsorship can stick.
The Decision Framework
Illinois utility-solar underwriting still has real variables. The regime helps. It does not decide.
Design to state-level standards
The statutory setbacks, height, glare, and decommissioning standards are the operative design envelope. Applications designed to local pre-2023 ordinance drafts risk unnecessary procedural friction. Design to the state standards and cite PA 102-1123 directly in the application narrative.
Screen the county-level political posture
The statute constrains counties but does not control them. Community risk review coverage of the target county — post-2023 approval track record, board composition, state's attorney alignment with the SAA issue brief — remains material. Hostile counties can still generate friction within the statutory window.
Underwrite interconnection separately
PA 102-1123 delivers a 75-day siting outcome. MISO and PJM interconnection queues operate on multi-year timelines governed by FERC Order 2023 cluster studies. A clean siting approval with a dirty interconnection position is not a financeable project. Screen both variables together.
The lesson from Illinois:
State preemption works when the law is tight, bipartisan, and practically administrable. PA 102-1123 is the template. It is also, critically, the least litigated of the 2023 state-preemption packages.
Design to the state standard; screen the county regardless.
Design to the state standard
RealClear screens Illinois utility-solar sites against PA 102-1123, county political posture, MISO / PJM interconnection queue position, and the SAA issue brief alignment — before application filing.
Cited research summary · Not legal advice · Verify independently before making investment decisions
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