Public data · Free to use
Illinois Data Center Power Rules: Large-Load Tariffs and State Law
How Illinois’s utilities and lawmakers handle data-center-sized power requests: 2 utilities, compiled from public filings, with a source on every entry.
Last checked October 22, 2026All states
Utilities
Illinois utilities and their large-load rules.
Ameren Illinois
IL · MISO · Ameren
No specific rule foundNo Ameren Illinois large-load tariff was found; Ameren reported 850 MW of signed construction agreements in Illinois in early 2026.
ComEd
IL · PJM · Exelon
ApprovedMar 2026Large-load security deposit provisions
Illinois regulators let ComEd require deposits from large-load developers, sized to each project's energy needs, to cover costs if a project leaves or underuses facilities.
- Security deposit sized to the project's energy needs
- Deposit covers costs if the customer closes, moves or underuses facilities built for it
- Transmission Security Agreements used for large projects
Sources: Capitol News Illinois, Regulators OK ComEd's plan to increase deposit costs for large-load projects like data centers (2026); NPR Illinois, Regulators OK ComEd's Plan to Increase Deposit Costs for Large Load Projects Like Data Centers (2026)
What this can and can’t tell you
The rules are public. Whether your site can get power isn’t.
Anyone could pull these filings; we compile them so they’re easy to find. Terms change often, so confirm them with the utility or the commission docket before relying on them.
Going deeper: Data Center Site Selection in Illinois: ComEd, Ameren, PJM vs. MISO and the Incentive Pause
This tracker · Public, free
- A utility’s published rules for large new loads
- The same answer for every site in that utility’s territory
- What the terms are if power is available
- Compiled from filings anyone can read
A BlackForge report · Site-specific
- Whether a specific parcel can actually be served, and roughly when
- Substation headroom and the realistic connection path
- Gas, water, fiber, buildable land and zoning, checked together
- Built and refreshed for your load, your timeline and your parcels
Cite this tracker
BlackForge Data Centers. "Illinois data center power rules," Large-Load Power Tracker. Last checked October 22, 2026. https://www.blackforgedatacenters.com/data-center-power-tracker/illinois
Free to reuse under CC BY 4.0 with credit.
Need the answer for a specific site in Illinois?
Parcel-level screening and verification, built for your load and timeline.