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FERC accepted PJM’s proposal to create a Large Load Registry in part, but it did not approve the entire filing. The October 9, 2026 order in docket ER26-3515 accepted tariff revisions in part and rejected others. The registry covers large loads generally—not just data centers—and PJM lists February and March 2027 as planned milestones for its tool and public information.
What FERC accepted—and what it rejected
The Federal Energy Regulatory Commission’s October 9, 2026 order is titled “Order Accepting Tariff Revisions in Part and Rejecting Tariff Revisions in Part.” That wording matters: the decision was a partial acceptance of PJM’s filing, not blanket approval. FERC’s eLibrary record identifies the order in docket ER26-3515.
PJM had proposed both Interim Resource Adequacy Service and a Large Load Registry, and requested an October 12, 2026 effective date for its filing. PJM’s filing description establishes the scope of that request. Secondary reporting says FERC accepted the registry and a 50 MW large-load definition, while rejecting the proposed interim curtailment service and other tariff revisions. Headwaters Wire’s report describes the threshold as cumulative peak load at a single electrical site.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteThe official order record confirms the partial outcome, but the detailed operative provisions and reasoning are not established by that record alone. Accordingly, the 50 MW description and account of the rejected service should be understood as secondary reporting, not a complete legal definition or summary of every directive in the order.
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What the Large Load Registry is for
PJM describes the registry as “a database of information pertaining to Large Loads” that PJM will establish and maintain to help administer large-load initiatives. The registry is therefore about large loads broadly; “data center database” is shorthand, not a description of a database limited to data centers. PJM’s Large Load page provides its description.
The issue sits within a wider set of grid-policy questions. In December 2025, FERC directed PJM to develop transparent tariff rules for service to AI-driven data centers and other large loads co-located with generating facilities. FERC described PJM’s territory as spanning 13 states and the District of Columbia and serving more than 67 million people. FERC’s December 18, 2025 fact sheet gives that context.
Separately, in June 2026, FERC announced section 206 show-cause proceedings involving all six regional grid operators and rules for connecting data centers, manufacturing facilities, and other large energy users. Those broader proceedings are distinct from PJM’s ER26-3515 tariff case; the registry order should not be treated as their resolution. FERC’s announcement describes the separate proceedings.
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What happens next: PJM’s posted milestones
PJM lists these implementation expectations on its Large Load page. They are posted plans, not guarantees that the milestones have already occurred:
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- February 1, 2027: A new registry tool is expected to be ready.
- March 2027: Public registry information aggregated by zone or area is expected to be available.
These dates distinguish PJM’s anticipated implementation from FERC’s October 2026 action. The registry is information PJM will maintain; the public information PJM describes is to be aggregated by zone or area, rather than a promise that the full registry will be publicly accessible.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How this differs from Interim Resource Adequacy Service
The registry and Interim Resource Adequacy Service were separate elements of PJM’s filing. A registry records information about large loads for PJM’s administration of initiatives; it is not itself an electricity service or a curtailment program. Reporting on FERC’s order says the Commission rejected the proposed interim curtailment service along with other tariff revisions. The exact scope and rationale of those rejections should be taken from the operative order, not inferred from the registry’s acceptance.
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