FERC accepts PJM large-load definition and registry, rejects interim curtailment service
- Commission accepts 50 MW Large Load definition and registry
- Interim Resource Adequacy Service and BYONC rules rejected
- PJM must file compliance revisions within 30 days
WASHINGTON, Oct 9 — The Federal Energy Regulatory Commission (FERC) on Oct. 9 accepted PJM Interconnection's proposed definition of Large Load and a Large Load Registry, effective Oct. 12, 2026, and rejected the grid operator's remaining tariff revisions, including a new curtailment service for new large loads.
PJM had said that, beginning in the 2027/2028 Delivery Year, it will be short of the capacity it needs to meet its regional reliability requirement, particularly because of data center load growth, according to the order in Docket No. ER26-3515-000.
The accepted definition covers end-use customer load with a cumulative peak of 50 MW or greater at a single electrical site. All affiliated load facilities within a one-mile radius count as one site. Under the registry, load serving entities must give PJM information about the Large Loads they serve.
The commission rejected the proposed Interim Resource Adequacy Service (IRAS). Under IRAS, new large loads that did not bring their own new capacity could be subject to load reduction requests during emergencies. FERC said parts of the proposed tariff appear to intrude on retail rate regulation, which is outside its authority, and that PJM had not shown the treatment was not unduly discriminatory.
"We do not take this decision lightly," the commission said in the order. It also provided guidance on how PJM could modify the proposal if PJM chooses to refile it.
The order also rejected rules for Bring Your Own New Capacity arrangements and the plan to exclude Eligible New Large Load from the capacity demand curve starting with Delivery Year 2029/2030. FERC said these elements are inextricably linked to IRAS.
Commissioner David Rosner concurred in a separate statement: "We need state regulators to establish clear rules for which customers should be curtailed first when circumstances require it."
PJM must submit a compliance filing within 30 days. PJM filed the proposal on Aug. 13, 2026.