Full Breakdown
PJM Considers New Ride-Through Standards After Massive Data-Center Outage
8/13/2026, 11:52:14 AM
Core Event
On July 22, a fault on a 230-kV line in Dominion Energy’s zone caused roughly 3,800 MW of data-center load to trip offline in northern Virginia, the largest such event in PJM Interconnection’s history. The sudden loss dropped PJM’s overall load by about 3.8 % to 96,205 MW from 99,984 MW. PJM restored its Balancing Authority Area Control Error limit within nine minutes, well under the North American Electric Reliability Corp. (NERC) 30-minute benchmark, and dispatched reactive-power resources to lower system voltage.
Background & Context
PJM operates the electric grid and wholesale power markets across 13 Mid-Atlantic and Midwest states plus the District of Columbia. The region hosts the world’s largest data-center cluster, which includes both traditional computing facilities and cryptocurrency-mining operations. Earlier incidents in 2024 and 2025 each saw sudden load transfers of about 1,500 MW in the same zone, prompting concerns that computational loads are overly sensitive to voltage fluctuations.
Data & Statistics
- July 22 outage: ~3,800 MW tripped, 3.8 % load drop.
- Load before outage: 99,984 MW; after outage: 96,205 MW.
- Recovery time: 9 minutes vs. NERC’s 30-minute standard.
- Prior similar events: two incidents of ~1,500 MW each in 2024 and 2025.
Official Statements & Responses
Operating Committee Chair Emanuel Bernabeu said the fault was “normally cleared” and that data centers should not disconnect, noting they appear too sensitive to voltage conditions. PJM manager of reliability engineering Matthew Wharton indicated the organization is evaluating an expansion of reliability requirements, including “ride-through” standards, to align with emerging industry practices. The North American Electric Reliability Corp. is also moving to set reliability criteria for computational loads, with a Federal Energy Regulatory Commission directive calling for final standards by the end of the year.
Implications for Grid Reliability
If PJM adopts stricter ride-through requirements, data-center and crypto-mining facilities may need to invest in equipment that can remain connected during voltage disturbances, potentially reducing the risk of large, rapid load drops. Such changes could improve overall grid stability in a region where computational loads represent a growing share of electricity consumption.
