Curtailment
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Grid interconnection Connecting large loads
FERC Accepts PJM's Large Load Definition and Registry, and Rejects Its Other Proposed Tariff Revisions
FERC accepted PJM's definition of a Large Load and its Large Load Registry, effective October 12, 2026, and rejected PJM's remaining proposed tariff revisions, among them the Interim Resource Adequacy Service and the rules for Bring Your Own New Capacity.
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Grid interconnection Connecting large loads
Until Network Upgrades Are Complete: The California ISO's Proposed Interim Service for Large Loads
The California ISO's draft final proposal of September 24, 2026 sets out a Flexible Interim Load Interconnection service, under which a large load would "interconnect flexibly and receive service up to a certain level based on grid conditions and constraints until network upgrades are complete." The ISO says it will seek its board's approval on October 28, 2026.
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Rules and permits Rules and tariffs
Who Would Be Curtailed First: The Pennsylvania Commission's Proposal for Certain Large New Loads
On October 1, 2026, Pennsylvania's utility commission proposed that certain large new loads that have not secured sufficient new electric capacity be subject to curtailment before other customers when supply is tight. A formal comment period begins once the Tentative Order is published, and the commission anticipates considering a final order in January 2027.
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Grid interconnection Connecting large loads
New Capacity, or Reduce When Called: PJM Answers the Protests
On September 23, PJM answered the comments and protests on its proposal for new large loads. In the answer's words, such a load, or the entity serving it, must arrange for new capacity. Absent that, it must reduce its energy demands when called upon during system emergencies.
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Grid interconnection Connecting large loads
Studied Together: ERCOT's New Batch Process for Connecting Large Electricity Users
An explainer by the grid operator ERCOT, dated June 18, 2026, describes how it will study connection requests from large electricity users together, in batches, and two optional pathways for users that bring their own generation or let ERCOT reduce their power consumption.
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Grid interconnection Connecting large loads
Unless Approved by the Commission: The Texas Rule on Large Loads Co-Located With Existing Generation
A Texas rule filed on March 26, 2026 says an existing power plant registered with ERCOT may not net its output against a large load beside it unless the Public Utility Commission of Texas approves. ERCOT studies each arrangement, and the commission then approves it "with or without conditions," or denies it.
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Grid interconnection Connecting large loads
Without Compromising Speed to Power: The California ISO's Issue Paper on Large Loads
In an issue paper of January 30, 2026, the California ISO describes its current role in integrating large loads, such as data centers, on its grid, and names issues for future stakeholder talks. It says it is considering a policy initiative "to ensure maintenance of a reliable system without compromising economic development or speed to power."
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Grid interconnection Connecting large loads
Bring Your Own New Generation, or Connect and Manage: PJM's Board Letter on Large Load Additions
On January 16, 2026, PJM's Board of Managers wrote to stakeholders with its decision on large load additions. The letter encourages what it calls voluntary Bring Your Own New Generation. Where a load serving entity identifies a shortfall of new generation against its forecasted load additions, it directs the development of a framework under which that demand would be subject to curtailment before pre-emergency demand response. It also directs staff to develop a proposal for a backstop capacity procurement.
