Illinois Is Having Its Data Center Reckoning. Here Is What You Need to Know.

If you have been paying attention to the news in Illinois this month, you have probably noticed a theme. Data centers are everywhere. They are in the headlines, they are in the statehouse, and if certain developers get their way, they may soon be in the field next to your house.

March 2026 has been a whirlwind for data center development in this state. In the span of a single week, the Joliet City Council approved the largest data center campus in Illinois history, the Sangamon County Board voted to table a major data center proposal after more than 700 residents showed up to object, and the Illinois Commerce Commission greenlit new financial protections for ratepayers who could get stuck holding the bag when these massive facilities strain the grid. Meanwhile, Governor Pritzker has called for a two-year freeze on state tax incentives for new data center projects, and the POWER Act is working its way through the General Assembly.

That is a lot happening at once. And for landowners, neighboring property owners, ratepayers, and local governments, the stakes are enormous. Let me walk you through it.

Joliet Says Yes to a $20 Billion Campus

On March 19, the Joliet City Council voted 8-1 to approve the Joliet Technology Center, a proposed 795-acre data center campus to be developed by Dallas-based Hillwood Investment Properties and McLean, Virginia-based PowerHouse Data Centers. The project would consist of 24 data center buildings and carry an estimated price tag of $20 billion. District 5 Councilwoman Suzanna Ibarra cast the lone dissenting vote.

The hearing itself was something. More than 200 people packed the council meeting. Over 80 residents spoke during public comment, and the session ran so long that the council had to recess before midnight to avoid violating a state law that prohibits public meetings on election days. Residents raised concerns about water consumption, noise, strain on the electrical grid, and traffic. Hillwood executives pushed back, saying the campus would use closed-loop cooling systems and that daily water use across the full build-out would stay below 150,000 gallons. They also pointed to the economic upside: an estimated $2.1 billion flowing to local taxing bodies, including schools, over 30 years.

Those are real numbers. But so are the concerns. A project of this scale will require significant utility infrastructure to support it. New transmission lines, substations, water mains, and access roads do not appear out of thin air. They require easements, and easements require negotiations with the people who own the land they cross. If past infrastructure projects are any indication, those negotiations do not always go well for landowners who are not represented.

Sangamon County Pumps the Brakes

Two days after Joliet said yes, Sangamon County said not so fast.

On March 23, the Sangamon County Board voted 15-13 to table a conditional zoning use permit for CyrusOne, a Dallas-based data center developer, to build a roughly $500 million facility on approximately 280 acres of farmland in Talkington Township, southwest of Springfield. More than 700 residents turned out for the board meeting, and the overwhelming majority were there to oppose the project.

The opposition in Sangamon County echoed much of what was heard in Joliet, but with a sharper edge. This is central Illinois. The proposed site is farmland. Residents were not just worried about water and electricity. They were worried about losing productive agricultural land to a facility that, by its nature, employs relatively few people per acre. Data centers are not factories. They do not bring hundreds of jobs to a community. They bring servers, cooling systems, and a handful of technicians.

The Sangamon County situation is not unique. In Bloomington, ten of the eleven residents who spoke during public comment at a recent City Council meeting voiced opposition to the possibility of a data center development on 375 acres. In the Rockford area, Monarch Energy has proposed its own facility. Across the state, the pattern is the same: developers arrive with big numbers and promises of economic growth, and residents push back with questions about what those projects actually mean for the communities absorbing them.

Tabling the proposal does not kill it. It puts it on hold while the board considers its options. But the message from the community was clear: you do not get to plop a half-billion-dollar facility on our farmland without a real conversation about what that means for the people who live here.

The ICC Steps In to Protect Ratepayers

Behind the scenes, the Illinois Commerce Commission has been watching the data center boom with growing concern. On March 20, the ICC approved a proposal from Commonwealth Edison that requires developers of large-load projects to post security deposits based on their energy needs. The idea is straightforward: if a data center gets built, draws massive amounts of power from the grid, and then goes under or moves somewhere else, ratepayers should not be left paying for the infrastructure that was built to serve it.

The numbers are worth knowing. Projects requiring 50 megawatts or more will face a base application deposit of $1 million. Projects exceeding 200 megawatts will see an additional $500,000 tacked on for every 100-megawatt increment above that threshold. For a massive campus like the one proposed in Joliet, those deposits could add up quickly.

The ICC also directed its staff to open new proceedings to investigate what it called "significant reliability, affordability, and policy risks" caused by large-load projects in ComEd's territory. In plain English, the Commission is worried that the rush to build data centers is outpacing the grid's ability to keep up, and that ordinary residential customers could end up paying higher bills to subsidize the infrastructure these facilities need.

The POWER Act and the Governor's Tax Freeze

The regulatory response does not stop at the ICC. The POWER Act (SB4103/HB5513) would establish statewide standards for data center development, covering clean energy procurement, utility cost responsibility, water use, pollution controls, and community engagement. The bill is still in committee, but it has attracted serious attention from both environmental groups and industry players.

And then there is Governor Pritzker. In his February budget address, the Governor called for a two-year suspension of state tax incentives for new data center developments, effective July 1, 2026. He also directed state agencies to study the impact of existing data centers on the energy grid and on consumers. Illinois currently has at least 222 data centers, the fifth highest count in the country. The Governor's message was unmistakable: we need to understand what we are getting into before we give away any more tax breaks.

The General Assembly still has to approve the suspension, and the data center industry will no doubt push back. But the political wind is blowing in a direction that would have been hard to imagine even a year ago. A state that actively courted data center investment with tax incentives is now asking hard questions about whether those incentives were a good deal for anyone other than the developers. Illinois has at least 222 data centers already. A recent state report warned that the continued pace of development could outstrip the state's energy supply. These projects are no longer getting rubber-stamped.

What This Means for You

If you are a landowner in an area that has been targeted for data center development, or if you are near a proposed site, you have rights. Zoning decisions can be challenged. Easement negotiations should not be one-sided. And the infrastructure that follows these projects, including transmission lines, substations, pipelines, and access roads, will affect your property in ways that developers are not always eager to discuss up front.

At Phillips & Bathke, we have represented landowners in utility and infrastructure matters across Illinois. We understand how the ICC process works, how easement acquisitions are conducted, and how to make sure our clients are not shortchanged when a major project comes to their community. We know what fair compensation looks like, and we know what happens when landowners accept the first offer without understanding what they are giving up. If a data center, transmission line, or pipeline is headed your way, the worst thing you can do is wait until the bulldozers show up.

It is also worth noting that the regulatory landscape is evolving in real time. The ICC proceedings, the POWER Act, and the Governor's proposed tax freeze are all still in progress. The rules that govern how these projects are approved, built, and operated could look very different six months from now. If you are a landowner or a community leader dealing with a data center proposal, staying informed is not optional.

This is not a hypothetical anymore. The data center boom is here. Illinois is scrambling to figure out the rules. And the people who stand to be most affected, the landowners and ratepayers, are the ones who need to pay the closest attention.

Jonathan Phillips represents individuals and entities opposing data center developments in their communities. He is an attorney at Phillips & Bathke, P.C., a firm he founded, and can be contacted through that website or this one.