The Data Center Became Curtailable Load

The cloud was sold as weightless. The grid has declined the metaphor.

In this episode, Sam Ellis reports on the point where AI infrastructure stops being a private cloud-procurement story and becomes a public grid-reliability problem: data-center load, capacity shortfalls, tariff reform, large-load registries, curtailment, telemetry, remote-disconnect authority, and the question of who pays when agent infrastructure becomes operating load.

The lede is an Ashburn, Virginia grid event reported by Data Center Knowledge. A transmission fault prompted hyperscale data centers to transfer themselves to backup power, and more than three gigawatts of demand disappeared from PJM in seconds. Dominion Energy said no load was shed and that it did not disconnect the data centers; the facilities' own control systems transferred them. At that scale, customer behavior becomes grid behavior.

The episode follows the regulatory response through FERC's June large-load tariff proceeding, PJM's July 31 Reliability Backstop Procurement proposal, and PJM materials for an Interim Resource Adequacy Service framework. PJM's own release describes a 6,831 MW shortfall from the recent capacity auction for the 2028/2029 Delivery Year. The proposed response includes backstop procurement, state retail-cost allocation fights, a Large Load Registry, and load reductions during grid stress for large loads that have not secured their own supply.

Texas supplies the second-grid proof point. Governor Greg Abbott directed the Public Utility Commission of Texas and ERCOT to audit data centers moving through ERCOT's interconnection process, and ERCOT delayed Batch Zero large-load classification notices while seeking a good-cause exception. ERCOT is considering more than 474 GW of connection requests, and the governor's office says about 90 percent of new power requests are data centers.

Sam's hook: tokens can get cheaper, models can get faster, and routing can get smarter, but long-running autonomous agents still need power that must be modeled, backed, rationed, and publicly allocated. The unit is not just inference. It is megawatts under stress.

If you work in grid planning, utility regulation, data-center operations, cloud procurement, agent infrastructure, or state energy policy, email [email protected] with the subject line Curtailable load. Anonymous notes and source-protection requests are welcome.

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Sources

• Data Center Knowledge: “Fault in Data Center Alley Triggered 3 GW Load Drop on PJM” — source for the Ashburn transmission-fault event, Dominion Energy's statement that no load was shed and Dominion did not disconnect data centers, and Neil Osnato's quote that a 3 GW customer response is grid behavior.
• FERC: PJM Interconnection, L.L.C., Docket EL26-67-000 — source for FERC's large-load tariff proceeding, show-cause order, Network Upgrade cost-recovery concerns, flexible-load service questions, remote-disconnect mechanics, and the residential-customer cost-shift quote used in the episode.
• PJM Inside Lines: “PJM Reliability Backstop Proposal Outlines Steps To Secure New Supply and Maintain Reliability” — source for PJM's public explanation of the July 31 Reliability Backstop Procurement proposal, the 6,831 MW shortfall, the $555/MW-day maximum willingness to pay, state retail-cost allocation limits, and the expected IRAS/load-reduction filing.
• PJM FERC filing: Reliability Backstop Procurement, ER26-3380-000 — source for the filed RBP details, including the 2028/2029 capacity-auction shortfall, Sept. 30 target, Sept. 29 FERC-acceptance condition, and cost-allocation framework.
• PJM: Interim Resource Adequacy Service executive summary and redline — source for the Large Load Registry, new large-load reduction concepts, and proposed reductions before Pre-Emergency Load Management.
• Data Center Knowledge: “PJM Says AI Data Centers Must Bring Capacity to Earn Firm Service” — source for Neil Osnato's “prove the megawatts, prove the flexibility” quote and the connected-versus-firm-service framing.
• Data Center Coalition: Connect & Manage executive summary — source for the customer-side pressure test: a state opt-in model, state interruptible tariffs, electric-distribution-company curtailment execution, and the Data Center Coalition's public position that new capacity should accompany significant new load.
• Joint Consumer Advocates presentation to PJM CIFP-RBP — source for consumer-advocate concerns over costs, credit obligations, collateral requirements, stranded-cost risk, and ratepayer exposure.
• Monitoring Analytics: IMM Backstop Auction Design Proposal — source for the independent market monitor's backstop-auction design materials and the $23.1 billion estimate cited in the episode.
• Office of the Texas Governor: “Governor Abbott Directs Comprehensive Data Center Audit” — source for the Texas audit directive, the more than 474 GW connection-request figure, and the statement that about 90 percent of new power requests are data centers.
• ERCOT Market Notice M-A080326-01 — source for ERCOT's Batch Zero large-load classification delay and good-cause-exception posture before the Public Utility Commission of Texas.
• PJM Inside Lines: “Over 700 New Generation Projects Accepted Into First Cycle of Reformed Interconnection Process” — source for PJM's Aug. 3 statement that 715 generation projects representing more than 200 GW of nameplate capacity qualified to be studied in the first cycle of the reformed interconnection process. The episode treats study entry as supply-side pressure, not built or accredited capacity.

Send tips, corrections, and source notes to [email protected].