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Chicago & Illinois data-center power demand

The Midwest's data-center capital runs on the nation's biggest nuclear fleet — and is now testing how much load even cheap, clean, always-on power can absorb.

A Gridlas analysis · public CBRE / EIA / Illinois state data · current as of late 2025

Chicago is one of the eight primary U.S. data-center markets, and its anchor is Elk Grove Village — the "data center capital of the Midwest," a dense industrial cluster just west of O'Hare that holds a large share of the state's incentivized sites. But the newest and biggest projects are leaving the suburbs for open land with power: gigawatt-scale campuses in Joliet, Minooka, and DeKalb, chosen for interconnection capacity first and location second.

Two things made Chicago a magnet. First, power: Illinois generates more nuclear energy than any other state — 11 reactors producing roughly 54% of its electricity — giving data centers exactly the round-the-clock, low-carbon baseload they want. Second, policy: the 2019 Data Center Investment Program offered up to 20 years of sales-tax exemptions for projects investing $250M+, pulling in over $15.8 billion in commitments.

Now the model is straining. Rapid load growth and rising electricity bills have turned data centers into a political issue: the governor has proposed a two-year pause on the tax incentives starting mid-2026, and grid operators are flagging capacity pressure. Even a nuclear-rich grid, it turns out, has a ceiling on how fast it can absorb gigawatt loads.

Why it matters

Chicago is the test of whether abundant clean power plus aggressive incentives can outrun the same forces squeezing every other market — interconnection queues, transmission limits, and public pushback on cost. How Illinois resolves the incentive fight is a leading signal for how other states will manage the buildout. It's the local face of a national grid bottleneck.