Illinois (IL) data center power coverage
Real, sourced large-load tariff and interconnection research on file for Illinois — never inferred, never scraped, never implied beyond what's actually been checked.
Large-load tariffs
Commonwealth Edison (ComEd), large demand project applicants (Rider DE)
ThresholdProjected maximum kilowatts delivered of 50 MW or more before December of the 10th year after the requested service date
StatusLarge demand project applicants must post a deposit for analysis and engineering costs: $1,000,000, plus $500,000 for each additional whole 100 MW above 200 MW. Deposits above $2,000,000 require an acceptable letter of credit for the excess. Subject to the ICC investigation in dockets 25-0677/25-0679. SEPARATELY, not a ComEd/utility matter: Gov. Pritzker directed the Dept. of Commerce and Economic Opportunity (DCEO) to pause processing new agreements under the state's Data Center Investment Program (a state tax-incentive program, not a utility interconnection process) effective July 1, 2026 -- announced June 5, 2026, framed as part of a 2-year incentive suspension pending legislative study of cost/environmental impact. Existing agreements signed before July 1, 2026 are honored; this does not affect ComEd's Rider DE process above.
SourceComEd compliance filing, ICC Docket 25-0677/25-0679 (March 30 2026): https://www.icc.illinois.gov/downloads/public/filing/4/397281.pdf; Gov. Pritzker DCEO directive, announced June 5, 2026 (news coverage: eenews.net, stlpr.org; Governor's office primary text not directly located during this research).
Interconnection & regulatory guidance
Illinois — no statewide tariff law enacted yet; the POWER Act failed to advance in 2026
Contact guidanceComEd has its own detailed entry (Rider DE) if it serves the site -- this entry exists to record real statewide political context, not an adopted statewide rule.
ThresholdNot applicable -- nothing statewide is enacted yet. The POWER Act, as proposed, would have applied to hyperscale data centers over 50 MW.
ProcessThe POWER Act (SB 4016 / HB 5513), the most significant statewide data-center bill proposed in 2026, would have required a large-load tariff for data centers over 50 MW, mandated energy/capacity supply plans with local clean-energy investment, and required $2-12 million/year payments into an affordability fund. The Illinois General Assembly's 2026 regular session ended without advancing it. Separately, Gov. Pritzker paused new data-center tax incentives (announced June 5, 2026) and directed the General Assembly to revisit the issue during its veto session later in 2026 -- confirm whether that revisit produced any enacted change directly.
Deposit / costSeparately from the POWER Act, the Illinois Commerce Commission already approved a ComEd-specific proposal letting it require security deposits from large-load developers based on project energy needs -- covered in ComEd's own dedicated entry.
SourceCapitol News Illinois / NPR Illinois (nprillinois.org, capitolnewsillinois.com) coverage of the POWER Act's status and the ICC's ComEd deposit approval; Route Fifty (route-fifty.com) on the state being "not quite ready" to pass regulation as of mid-2026.
Land-constraint screening
Every Kill Test automatically screens against 6 nationwide land-constraint layers, Illinois included — no state-by-state gaps here.
FEMA Flood ZoneNearby WetlandsProtected / Conservation LandCritical HabitatSeismic HazardTribal Land
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