daily · Electrification

FERC rejects ComEd notice to cancel Illinois data-center transmission agreement

FERC rejected Commonwealth Edison’s notice to cancel a transmission security agreement for PowerHouse Hillwood’s planned 1.8-GW Joliet data center. The agency declined to decide a disputed credit-support clause, leaving contract interpretation to the courts.

By Greener Numbers Editorial Team · Published September 27, 2026 · Updated 9/27/2026

The Federal Energy Regulatory Commission rejected Commonwealth Edison’s notice of cancellation for a transmission security agreement with PowerHouse Hillwood Holding on September 22, 2026. The filing appears in FERC docket ER26-3257 as an order rejecting the cancellation notice. Utility Dive reports that the agreement concerns a proposed 1.8-gigawatt data center in Joliet, Illinois, whose planned investment is estimated at $20 billion. Those are proposed capacity and investment figures, not operating power use or completed spending.

The dispute concerns the agreement’s credit support. PowerHouse Hillwood says it met the initial requirement with a $1 posting; ComEd disputes the contract’s meaning. Utility Dive reports that a related case is pending in the U.S. District Court for the Northern District of Illinois. FERC declined to assert primary jurisdiction over interpretation of the ambiguous credit terms, saying a court could handle that dispute. The agency’s rejection of a cancellation notice is not a final court ruling that the project can proceed or that every contract obligation has been met.

Commissioners used the case to call for clearer large-load cost-recovery agreements. Their concern is that transmission investments for a large customer should not unfairly shift costs to other ratepayers if the project changes or fails. FERC’s docket documents the September order; Utility Dive reports its specific project details and the commissioners’ statements.

The source draft treated the decision as a broad legal precedent forcing utilities to honor every large-load contract, cited a Section 206 finding, and claimed FERC directed specific planning and reliability steps. The available order description and reporting support a narrower outcome: this cancellation notice was rejected, while the underlying contract dispute remains unresolved in court.

Official source: Gemini Daily Brief Bridge ↗