ComEd's $3.1 Billion Data Center Expansion: Who Pays?

Updated November 6, 2026.

Data centers are becoming a much bigger part of the development conversation in Illinois. We're hearing about the land they need, the electricity they consume, the jobs they might create and the tax revenue they're expected to generate.

But there's another question that hasn't gotten nearly enough attention.

Who's paying for all the electrical infrastructure these developments need?

That question is now at the center of an investigation by the Illinois Commerce Commission, the state agency responsible for regulating utilities like ComEd.

According to documents filed in that investigation, ComEd estimates approximately $3.12 billion in electrical infrastructure costs associated with 25 major projects at the front of its large-customer connection queue.

And while the developers are expected to pay costs associated with their projects, consumer advocates are raising concerns about whether those arrangements fully protect the rest of us.

For homeowners and businesses in Frankfort, Mokena, New Lenox, Orland Park and the surrounding southwest suburbs, this is worth paying attention to.

Where Is the $3.1 Billion Going?

Large data centers use enormous amounts of electricity. Connecting them to the power grid isn't always as simple as running another line from the street.

Some projects require new substations, major electrical connections and improvements to the existing power system.

Here's how ComEd's estimated costs break down.

Source: ComEd's infrastructure-cost exhibit filed in Illinois Commerce Commission Docket 26-0364. Figures are rounded.

These are estimated costs, not a $3.1 billion charge already approved for homeowners. That's an important distinction.

But the amount of money involved is substantial, and the question is how securely those costs are assigned to the companies creating the demand.

What Happens if a Data Center Never Gets Built?

This is where things get interesting.

Imagine a developer announces a massive data center and requests enough electricity to power it.

ComEd begins planning the infrastructure. Equipment is ordered, electrical improvements are scheduled and construction costs start adding up.

Then the developer changes its plans.

Maybe the project gets delayed for years. Maybe it gets downsized. Maybe it never gets built at all.

What happens to the money already spent preparing the electrical system?

That's the risk consumer advocates are asking Illinois regulators to address.

The concern is that some costs could eventually be spread among other ComEd customers instead of being paid entirely by the developments responsible for them.

And that means people who have absolutely nothing to do with these data centers could potentially end up helping pay for infrastructure built around their anticipated electricity needs.

Aren't the Developers Already Paying?

Yes, there are financial requirements in place.

ComEd's filings identify approximately $721 million in distribution-related deposits and upfront charges associated with the projects examined.

ComEd also reports approximately $1.4 billion in financial security under separate transmission agreements as of July 2026.

Those figures represent different types of financial commitments. They aren't necessarily money ComEd has already collected, and they shouldn't simply be added together and treated as a final payment.

ComEd argues that its existing agreements, along with additional protections it is proposing, are sufficient to protect other customers from the financial risks.

Consumer advocates disagree.

They want stronger requirements that would make developers pay more of their infrastructure costs upfront, rather than relying on payments collected over time.

The concern isn't that developers aren't paying anything. It's whether they're financially responsible for enough of the costs if their projects don't turn out as planned.

Could This Raise Your ComEd Bill?

Potentially, yes. But that doesn't mean your bill is about to increase because of this $3.1 billion estimate.

There are two different issues here.

First, the growing demand for electricity from data centers is already part of the broader debate over rising wholesale electricity prices. Consumer advocates argue that data center demand has contributed to higher costs being passed along to residential customers.

Second, there's the cost of building the electrical infrastructure these projects require.

If developers pay their allocated costs as expected, those investments don't necessarily become an additional burden on homeowners.

But if projects are abandoned, delayed or consume less electricity than projected, the question becomes whether ComEd's financial agreements adequately cover the resulting costs.

Consumer advocates have submitted scenarios showing that hundreds of millions of dollars in transmission costs could potentially shift to other customers under certain unfavorable development outcomes.

Those are modeled scenarios, not bills that have already been sent to Illinois households.

Still, we're talking about enough money that even a relatively small portion becoming someone else's responsibility deserves scrutiny.

What Is Illinois Doing About It?

The Illinois Commerce Commission is examining these questions in Docket 26-0364.

ComEd, consumer advocates, the Illinois Attorney General's Office, industry representatives and Commission staff have submitted evidence and recommendations.

Interestingly, even the Commission's own staff has recommended requiring certain large electricity customers to pay their distribution construction costs upfront.

ComEd prefers a different approach that would recover those expenses over time while requiring financial guarantees.

The Commission must decide what protections are appropriate and how costs should be allocated.

Under the current procedural schedule, a proposed order is expected around December 8, 2026, with the Commission's decision deadline extended to February 26, 2027.

Follow the official Illinois Commerce Commission case here.

Why This Matters in the Southwest Suburbs

This isn't a $3.1 billion estimate specifically for Will County. The projects are spread across ComEd's northern Illinois service territory, and the publicly released cost spreadsheet does not identify all the individual developers or their locations.

But electricity costs don't stop at municipal boundaries.

Whether you live in Frankfort, New Lenox, Tinley Park, Orland Park or somewhere else served by ComEd, decisions about how the company recovers its costs can affect the rates customers pay.

And as more communities consider data centers, I think there are two separate conversations we need to be having.

One is whether these developments make sense for the communities where they're proposed.

The other is whether the financial arrangements behind them adequately protect the millions of people who already depend on the electrical system.

A development might promise investment, construction jobs and future tax revenue. Those benefits deserve consideration.

But so do the costs and risks, especially when there's a possibility that people outside the development could end up sharing them.

The Bottom Line

I'm not suggesting that Illinois homeowners are already paying a $3.1 billion bill for data center infrastructure. The evidence doesn't establish that.

What the public records do establish is that ComEd anticipates billions in electrical improvements for large developments, and state regulators are reviewing whether the financial protections are strong enough.

The companies building these projects stand to benefit from the infrastructure. The question is how much of the financial risk they should be required to carry.

For me, that's the issue worth watching.

If a data center project doesn't work out, should the people who never had anything to do with it be expected to help cover the cost?

Illinois regulators are considering that question right now.

Sources: Illinois Commerce Commission Docket 26-0364; ComEd Response Exhibit A; November 4, 2026 initial briefs filed by Commonwealth Edison Company, Joint Non-Governmental Organizations including the Citizens Utility Board, and Illinois Commerce Commission staff.

View ComEd's original infrastructure-cost exhibit.