Breaking: Data Centers Strain Grid as PJM Emergency Ends Shoulder Season Relief
Federal order allowed PJM to direct data centers to backup power, marking a shift in how the grid manages round-the-clock digital demand.
By Leila Reynolds ·
The U.S. Department of Energy declared a power grid emergency across 13 states and the District of Columbia on Sunday, October 12, 2026. Energy Secretary Chris Wright issued the order under section 202(c) of the Federal Power Act, granting PJM Interconnection temporary emergency authority to keep the regional grid stable from October 13 through October 16. The primary focus of this emergency was the changing nature of electricity demand, specifically the strain placed on the system by data centers. These facilities represent a new category of load that no longer provides a seasonal reprieve for grid operators.
PJM coordinates wholesale electricity for about 67 million people across Delaware, Illinois, Indiana, Kentucky, Maryland, Michigan, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia, and the District of Columbia. The organization stated that the shoulder season reprieve is not what it used to be. Most of the new, rapidly growing demand comes from data centers and other energy-intensive large-load customers. Their consumption does not fall with the weather, creating a 12-month, 24/7 phenomenon that outpaces new transmission and electricity supply. This persistent load means that unseasonably hot or cold weather now arrives outside the traditional peak seasons, removing the historical buffer that allowed for maintenance.
The emergency order allowed PJM to call on generators to run in excess of their operating permits as needed. It also directed data centers and other large electricity users onto their backup generation if necessary. The Department of Energy noted that PJM wanted to deploy auxiliary, standby, directly connected, battery storage, or other generation resources at data centers, including hyperscaler facilities, and at other large industrial and commercial customer sites. This authority was critical because the expanding demand from these digital hubs was colliding with the fall maintenance period.
Unusually warm October weather intersected with the time when generator and transmission owners take equipment offline for upgrades ahead of winter. Most scheduled outages are prohibited in summer, but the summer peak period ended in mid-September. On Friday, October 9, PJM issued a Capacity Advisory for Monday, October 12, and Tuesday, October 13. This was the first use of that procedure, which PJM members endorsed in June 2026 for circumstances indicating an approaching capacity shortfall. The load forecast was about 102,000 megawatts of peak demand on Monday and about 104,000 megawatts on Tuesday. This demand occurred against previously scheduled generation outages of about 70,000 megawatts plus planned transmission outages.
Paul Dajewski, PJM’s senior manager for dispatch, told stakeholders that this volume of outages is typical for the shoulder season. However, the persistent demand from data centers made the situation more critical than in past years. On Monday, October 12, PJM issued a Maximum Generation Alert and a Load Management Alert for October 13. It extended the Capacity Advisory through October 14 and issued a Maintenance Outage Recall for October 14 after forecasting demand of approximately 111,500 megawatts or higher. On October 13, PJM extended the Maximum Generation Alert and Load Management Alert through October 14 and called on Demand Response programs.
A Maximum Generation Alert tells transmission and generation owners that conditions will be tight so they can defer or cancel equipment maintenance and testing. It also informs neighboring grid operators that exports from PJM may be curtailed. Scheduled transmission line outages limited how much electricity could move between zones, causing generation to be bottled in some areas. This was particularly evident in resources serving congested zones in Washington D.C., Maryland, and Virginia. Federal officials and PJM said the order was meant to prevent interruptions, not to announce scheduled blackouts. No blackouts occurred, and no mandatory conservation orders were issued for households.
The situation highlighted a structural shift in grid management. PJM had used Department of Energy emergency orders during two unseasonably warm September periods in 2026 to let eligible resources keep operating beyond normal limits. The current emergency underscored that data centers are now a primary driver of system stress. On Friday, October 16, PJM issued another Capacity Advisory for Monday, October 19, with a load forecast of about 94,573 megawatts against expected generation outages of about 72,000 megawatts.
In its Winter Outlook published on November 5, 2026, PJM expects sufficient resources to reliably meet demand this winter under expected conditions. The organization projects 182,426 megawatts of operational capacity to serve a forecast winter peak of approximately 147,500 megawatts, plus about 3,200 megawatts of average exports to neighboring systems. Michael Bryson, PJM’s senior vice president of operations, stated that the goal is to coordinate operations with generation and transmission owners to proactively manage the system to perform at high levels when consumers need energy the most.
