Zoning Due Diligence for Solar Farm Development on Agricultural Land in Illinois

As of November 2025, Illinois had over 4,944 MW of operating solar capacity — a figure the state expects to grow dramatically as it pursues its Climate and Equitable Jobs Act (CEJA) targets of 40% renewable energy by 2030 and 100% clean energy by 2050. The Illinois Solar Map tracks this expansion across utility-scale, community, and distributed installations, and large-scale projects continue to reshape rural counties throughout the state. ACCIONA’s Will County solar farm alone represents a $300 million private investment with up to 300 construction jobs, while Nautilus Solar Energy — which recently relocated its headquarters to Chicago — expects to add 100 MW of new capacity in Illinois in FY2026.

For developers and investors evaluating agricultural parcels, the state-level policy environment is favorable. But solar farm special use permit requirements at the county level introduce entitlement complexity that directly affects project timelines, construction budgets, and pro forma assumptions. Understanding that regulatory landscape before committing capital is essential.

How Illinois State Law Governs Solar Farm Zoning on Agricultural Land

In January 2023, the Illinois legislature enacted Public Act 102-1123, which fundamentally reshaped the relationship between state energy policy and county-level land use authority. The law prohibits counties from adopting zoning regulations that disallow commercial solar on land zoned agricultural or industrial — eliminating the possibility of outright bans that some jurisdictions had imposed or considered.

The legislation also sets maximum standards for several key development parameters. Counties may impose requirements, but cannot adopt standards more restrictive than those specified in the statute. This applies to setback distances, height limitations, noise thresholds, and decommissioning obligations. Counties that had existing ordinances conflicting with the new law were required to amend them by May 2023.

However, Public Act 102-1123 does not eliminate the permitting process itself. As the University of Illinois Extension explains, counties retain the authority to require special use permits or conditional use approvals for commercial solar — and most do. The law sets the floor for what counties must allow; it does not dictate how quickly or easily approvals are granted.

Special Use Permit Requirements for Illinois Solar Farms

Most Illinois counties classify solar farms as a conditional or special use in agricultural districts. The approval process involves formal application with detailed site plans and engineering documentation, notification to adjacent property owners, a public hearing before the county Zoning Board of Appeals, and findings of fact demonstrating compliance with the county’s standards of approval.

Standards of approval typically address health and safety impacts, effects on neighboring property values, conformance with the county’s comprehensive plan, and adequacy of infrastructure, access, and drainage. The Illinois Local Government Solar Toolkit provides model ordinance language that many counties have adopted or adapted.

Timeline from application to board action generally runs 2 to 4 months for uncontested applications, though projects on prime farmland or near residential areas may face organized opposition that extends the process considerably.

Setback and Dimensional Standards

Under Public Act 102-1123, the minimum setback from a non-participating property line is 50 feet measured from the nearest component of the solar facility. However, individual counties frequently impose greater distances from residences — setbacks of 150 feet or more from non-participating homes are common and can significantly reduce buildable area on smaller parcels.

Panel height is generally capped at 20 feet above grade at maximum tilt, with transmission lines and utility poles exempt. Counties cannot impose height restrictions more stringent than this state-level standard.

Stormwater, Environmental Review, and Screening

Solar farms are subject to the county’s stormwater management and erosion control provisions and almost always require an NPDES permit. Vegetative screening between the installation and adjacent residential properties is a standard condition, with most counties requiring native plantings that satisfy pollinator-friendly habitat standards established by the Illinois Department of Natural Resources.

Environmental review through the IDNR’s EcoCAT program is required to screen for potential impacts to endangered species and wetlands. This consultation should be initiated early — a negative finding can require site redesign, and delays at this stage cascade through the permitting timeline.

Agricultural Impact Mitigation Agreements Under Illinois Law

Every commercial solar project on agricultural land in Illinois must submit an Agricultural Impact Mitigation Agreement (AIMA) to the Illinois Department of Agriculture. This requirement exists in state statute and applies regardless of whether the county has adopted its own solar ordinance.

The AIMA establishes binding obligations for protecting and restoring agricultural land during and after the solar project’s operational life. Key provisions address:

• Topsoil preservation — separation and stockpiling during construction
• Drainage tile — repair, monitoring, and restoration of existing tile systems
• Soil decompaction — remediation of compaction caused by construction equipment
• Vegetation management — compliance with the Illinois Noxious Weed Law (505 ILCS 100)
• Site restoration — full return to agricultural use after decommissioning

Under Public Act 102-1123, counties cannot impose construction, decommissioning, or financial assurance standards more restrictive than those in the IDOA’s standard AIMA. This provision effectively nationalizes the baseline obligations across all Illinois counties — but the costs are still substantial and must be modeled accurately in project financing.

Decommissioning and Financial Assurance for Solar Farm Development

County approvals universally require a decommissioning plan and financial assurance — typically a surety bond, letter of credit, or escrow account — guaranteeing site restoration at end of life. The decommissioning plan must address removal of all above-ground structures, foundations, and fencing, below-ground restoration including final grading and surface treatment, and any environmental remediation required under state or federal law. Underground cables buried at 5 feet or deeper may generally remain in place.

The financial assurance amount is based on an independent engineer’s cost estimate, subject to periodic recalculation over the project’s lifespan. For utility-scale projects, decommissioning obligations can represent a significant line item — one that developers occasionally underestimate during initial feasibility analysis. These costs belong in the pro forma from day one, not as a post-approval adjustment.

Managing Community Opposition in the Solar Farm Approval Process

Solar projects on agricultural land typically generate less organized opposition than data centers or gas stations, but resistance is not uncommon — particularly in counties where commercial solar is a relatively new land use. Common concerns raised at public hearings include visual impact from adjacent residences, perceived loss of productive farmland, potential effects on property values, and stormwater and drainage impacts.

Developers who invest in early community engagement — meeting with county board members, adjacent landowners, and local farm bureau representatives before filing — tend to navigate the hearing process more efficiently. Presenting concrete data on property tax revenue contributions, construction employment, and lease payments to participating landowners addresses the most common objections directly.

The Illinois Farm Bureau has been actively engaged in data center and solar siting policy discussions, and its county affiliates can be influential voices in the approval process. Understanding the local farm bureau’s position before your hearing date is basic due diligence that too many developers overlook.

Zoning Due Diligence Checklist for Solar Farm Site Selection

Before finalizing a land lease or purchase agreement for a solar farm site in Illinois, priority due diligence items include:

• County ordinance status — Has the county updated its solar regulations to comply with Public Act 102-1123?
• Use classification — Is solar permitted by right, conditional, or requiring a special use permit in the site’s zoning district?
• Setback analysis — What distances apply from non-participating property lines and residences?
• AIMA requirements — Costs and construction method implications of the state-mandated agreement
• Decommissioning obligations — Independent cost estimate for financial assurance modeling
• Overlay districts — Floodplain, environmental corridor, or agricultural preservation overlays
• Grid interconnection — Confirm utility interconnection feasibility and timeline with MISO or PJM

Identifying entitlement risks during due diligence — rather than after executing a 25-year ground lease — protects both timeline and capital.

How Birchwood Law Supports Solar Farm Development

If your team is evaluating agricultural land for solar development in Cook, Lake, or DuPage County, we can help assess the county’s regulatory framework, coordinate with planning staff, manage the special use permit process, and represent your project at public hearings. Contact us to discuss your project.

This content is for informational purposes only and does not constitute legal advice. The information provided does not create, and receipt of it does not constitute, an attorney-client relationship. You should not act upon this information without seeking advice from an attorney licensed in your own state or country.