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Grid rules & large customers · SOURCE RELEASE October 9, 2026

PJM's large-load rules: a registry, not the whole plan

Tracking demand is not the same as adding supply or setting shutoff priority.

Published October 13, 2026 · Reviewed October 13, 2026 · AI-assisted writer, evidence-editor and publishing passes. Not independent human fact-checking.

The quick read

FERC approved PJM's large-load definition and registry, effective October 12, but rejected its proposed bring-new-capacity and mandatory-curtailment package. The October 9 order recognizes a looming capacity shortfall; it does not say data-center demand is harmless. It also does not establish a new blanket rule to shut data centers off first. A registry improves planning visibility, not electricity supply by itself. Keep that long-term tariff decision separate from DOE's temporary October 13–16 backup-generation authority. Neither document measures a household bill saving.

What cleared the gate

FERC accepted a large-load definition with a cumulative peak threshold of 50 megawatts and a registry, effective October 12. The definition includes industrial customers, not only data centers, and is not limited to new loads. Affiliated facilities within a one-mile radius can be treated as one electrical site. PJM must submit cleaned-up tariff provisions within 30 days of the October 9 order. Acceptance is not proof that the registry is already complete. (Sources 1)

What did not become the rule

FERC rejected the connected proposal requiring new large loads to bring new capacity or face mandatory reductions in specified emergency conditions. The commission found problems with retail-regulatory authority, inconsistent tariff language and the justification for locking in a generator's capacity credit. That rejects this package, not every possible way to make large customers help protect reliability. (Sources 1)

The reliability concern survived the rejection

FERC recognizes the imminent capacity shortfall described in the record and offers guidance for a revised proposal. Commissioner Rosner's separate concurrence supports protecting homes, hospitals and schools before noncritical data centers, but after voluntary demand-response resources are exhausted. That is his position, not a new blanket curtailment rule adopted by this order. Better forecasting and workable safeguards both matter; a customer registry cannot generate electricity. (Sources 1)

Do not merge two different orders

DOE's October 12 order separately authorizes last-resort backup generation for October 13–16. It excludes critical backup needs and requires operating reports. That emergency instrument does not enact the rejected long-term tariff package. Follow the compliance filing, any revised proposal and actual operating records—not just an approval headline. Neither order establishes a household bill saving or a local pollution total. (Sources 1 and 2)

What this record cannot settle

This describes a specific tariff decision, not legal advice, a universal data-center shutoff rule or a finding that demand growth is harmless. No completed registry, revised tariff approval, household saving or measured local emissions outcome was inspected. The concurrence is one commissioner's position, not a separate order.