Breaking: PJM Orders Data Centers to Use Backup Power as Shoulder Season Reprieve Fades

The United States 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. The directive granted PJM Interconnection temporary emergency authority to keep the regional grid stable from October 13 through October 16, 2026. This specific authorization allowed PJM to direct data centers and other large electricity users onto their backup generation if necessary. It also permitted the grid operator to call on generators to run in excess of their operating permits. The primary objective was to prevent interruptions rather than to announce scheduled blackouts. No mandatory conservation orders were issued for households, and daily electricity use remained normal during the four-day period.

The urgency of this order stems from a fundamental change in how electricity is consumed in the PJM region. PJM notes that the traditional shoulder season reprieve is not what it used to be. Historically, demand would drop during the fall as weather cooled, providing a window for maintenance. Today, a significant portion of new demand comes from data centers. These facilities operate on a 12-month, 24/7 basis. Their consumption does not fall with the weather. This constant, round-the-clock demand creates a strain that no longer aligns with the seasonal ebb and flow of traditional industrial and residential use. The expanding demand from these energy-intensive customers is outpacing new transmission and electricity supply coming onto the system.

Unusually warm October weather collided with this new reality. The fall shoulder season is when generator and transmission owners take equipment offline for maintenance and upgrades ahead of winter. Most scheduled outages are prohibited in the summer peak period, which ended in mid-September. However, the heat in October kept demand high while maintenance outages were already scheduled. On Friday, October 9, PJM issued a Capacity Advisory for Monday, October 12, and Tuesday, October 13. This was the first ever use of that procedure, which PJM members endorsed in June 2026 for circumstances when projected conditions indicate 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 was 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. The challenge was the lack of a demand drop to offset these outages. On Monday, October 12, PJM issued a Maximum Generation Alert and a Load Management Alert for October 13. They extended the Capacity Advisory through October 14 and issued a Maintenance Outage Recall for October 14. This followed a forecast of demand at approximately 111,500 megawatts or higher. On October 13, PJM extended the alerts through October 14 and called on Demand Response programs. These programs pay customers who sign up in advance to cut electricity use when the grid is stressed. PJM stated that the alerts required no action from general customers.

The Maximum Generation Alert tells transmission and generation owners that conditions will be tight. It allows them to defer or cancel equipment maintenance and testing. It also notifies neighboring grid operators that exports from PJM may be curtailed. Scheduled transmission line outages further limited how much electricity could move between zones. Generation was bottled in some areas because of these transmission limits. This was particularly true for resources serving congested zones in Washington D.C., Maryland, and Virginia. The Department of Energy noted that PJM wanted to deploy auxiliary, standby, directly connected, battery storage, or other generation resources at data centers. This included hyperscaler facilities and other large industrial and commercial customer sites.

PJM coordinates wholesale electricity across all or parts of Delaware, Illinois, Indiana, Kentucky, Maryland, Michigan, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia, and the District of Columbia. This serves about 67 million people. The fragility of the grid under record demand became apparent as the region navigated these tight margins. Federal officials and PJM emphasized that the order was meant to prevent interruptions. The use of backup generation at data centers was a critical tool in this strategy. It allowed the grid to manage the constant load from digital infrastructure without relying solely on the main transmission network.

On Friday, October 16, PJM issued another Capacity Advisory for Monday, October 19. The load forecast was about 94,573 megawatts against expected generation outages of about 72,000 megawatts plus planned transmission outages. This pattern highlights the recurring tension between maintenance schedules and sustained digital demand. PJM had also used Department of Energy emergency orders during two unseasonably warm September periods. These periods ran from August 31 to September 4 and from September 15 to September 18. During those times, eligible resources operated beyond normal limits, and Demand Response was deployed. After sunset on those days, PJM had to cover net load as solar output fell faster than electricity use.

The situation has evolved into a new normal for grid operators. The shift from seasonal peaks to constant high demand requires different management tools. The authority to push data centers onto backup generation represents a significant step in this adaptation. It ensures that the most flexible resources are available to stabilize the system. As the region prepares for the colder months, the focus remains on managing this persistent load. The goal is to maintain reliability without forcing excessive strain on the physical infrastructure. The emergency order served as a temporary measure to bridge the gap between current supply and the new reality of digital consumption.