Illinois

Utility-specific tariff review

Track ComEd's docket and any later utility-specific tariff filings rather than treating a party proposal as a statewide rule.

State regulatory profile State framework source

Current position

ComEd's large-load-related distribution-extension tariff is in appellate review; Illinois has not adopted one statewide retail large-load tariff.

Actions: 1
Published tariffs: 0
Legislation: 1
Status: Under review

Regulatory and utility record

Tariffs, contracts, and proceedings

Each record is shown on its own terms. A utility-specific tariff or contract does not automatically apply to every large customer in the state.

ComEd · In progress

ComEd distribution-extension and large-load protections

ComEd's distribution-extension tariff revisions address financial exposure from large-load projects and are now in court-appeal status.

Open proceeding

Why it matters

The Commission action is not a statewide tariff and remains subject to appellate review.

Approved terms under review

Key requirements

Eligibility threshold

50 MW within ten years

The LDPAC process applies when projected peak load reaches 50 MW at any point in the submitted ten-year ramp.

Minimum payment

Ten-year transmission payment guarantee

The customer guarantees the annual transmission payments associated with its submitted ramp and pays any shortfall.

Minimum contract term

Ten-year transmission service agreement

Retail service depends on an effective FERC-filed and approved transmission service agreement covering the guarantee period.

Service structure: Distribution-extension tariff plus FERC transmission agreementAuthorized under reviewThe state tariff governs planning and distribution security while the transmission payment obligation sits in a federal agreement.
Charges and assessments: Customer-specific engineering and facilities depositsAuthorized under reviewRider DE refunds qualifying deposits over as many as ten years based on actual load and revenues.
Credit and collateral: A-/A3 letter-of-credit standardAuthorized under reviewThe order requires acceptable bank credit support for applicable deposits; surety bonds were not accepted as a substitute.
Grid infrastructure: $1 million plus $500,000 per whole 100 MW above 200 MWAuthorized under reviewThe engineering deposit funds planning and study work, with actual costs retained and the balance refunded or applied; long-lead materials require additional security.
Reporting and true-up: Annual compliance filingAuthorized under reviewComEd must report large-load activity and implementation, alongside Commission workshops and a follow-up report.

Official sources supporting these requirements

Official source ↗

Statutory record

Legislation

SB 3761

104th General Assembly

Data Centers—Various

Would create data-center disclosure and clean-energy provisions and require specified utility tariff changes, while adding annual operating, load-profile, and water-use reporting.

Re-referred to Senate Assignments under Rule 3-9(a).

In committee

Directly related · May 22, 2026

Official bill

“Not specified” means the current official tariff record does not establish a normalized term. Retail tariff requirements are not inferred from wholesale-grid rules, interconnection processes, or pending policy proceedings.