The U.S. Department of Energy issued an emergency order on July 2, 2026, authorizing grid operator PJM Interconnection to force data centers and other large energy users to switch to backup generators. This measure aims to prevent blackouts as a severe heat wave pushes power demand toward record-breaking levels across the Mid-Atlantic and Midwest.
Emergency Measures and the PJM Grid
As temperatures climb toward 110 degrees in some areas, PJM Interconnection, the nation’s largest grid operator, requested federal intervention to maintain transmission reliability. Energy Secretary Chris Wright granted the request, signing an order that remains in effect until Friday at 11:59 p.m. EDT. This directive allows PJM to require major energy users, specifically data centers, to transition to onsite backup power to alleviate strain on the regional grid.
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The situation is driven by a surge in demand for air conditioning, which has sent wholesale electricity prices soaring. According to data from the U.S. Energy Administration, spot electricity prices jumped 243% in New England and 101% in New York City on Thursday alone. While PJM has sufficient generating reserves to handle the heat, it expects electricity demand to peak at 166 gigawatts on Thursday afternoon, surpassing the previous record of 165 GW set in 2006.
Under the Federal Power Act, the Secretary of Energy possesses the authority to issue emergency orders under Section 202(c) when the grid faces a threat to reliability. This process typically involves a formal request from the grid operator, which must demonstrate that physical or environmental constraints prevent the market from clearing demand through standard pricing mechanisms. By shifting industrial load to behind-the-meter generation, grid operators can effectively reduce the total megawatt load pulled from the transmission system, thereby lowering the risk of frequency instability or localized voltage collapse.
Data Center Alley and Environmental Concerns
The reliance on backup generators has sparked concerns regarding air quality, particularly in Virginia, which serves as the epicenter of the nation’s data center industry. State regulators have permitted more than 8,000 diesel generators at these facilities. Critics point out that these units often lack the pollution controls required for long-term use and release emissions the EPA classifies as a “possible human carcinogen.”
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“This is exactly what we expect in a warming world. Even a modest increase in baseline temperature causes an exponential increase in heat extremes. You find yourself crossing these heat extremes much more frequently.”
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Kim Cobb, climate scientist at Brown University
Aaron Tinjum, vice president of energy for the Data Center Coalition, stated that facilities are prepared to cooperate with grid operators. He noted that data centers will use backup power if directed to do so, aiming to ensure that first responders and the public remain connected to essential services during the peak heat.
The environmental impact of these generators is a point of significant regulatory friction. Unlike utility-scale power plants, which are subject to stringent Clean Air Act standards, backup generators are typically permitted as “stationary emergency engines.” These permits generally limit operation to a specific number of hours per year for testing and maintenance. The current emergency order creates a legal gray area, as it compels these facilities to run for purposes other than emergency backup or routine testing, raising questions about whether they have exceeded their permitted emission thresholds for nitrogen oxides and particulate matter.
Regional Disparities in Grid Readiness
Not all utilities are operating under the same constraints. Jeff Brooks, a spokesman for Duke Energy, clarified that the utility’s units in the Carolinas operate outside of the PJM territory. He stated that the company expects to meet current demand without resorting to emergency load-shedding measures.
“We have adequate generation to serve our customers this week and don’t anticipate issues.”
Jeff Brooks, Duke Energy spokesman
Meanwhile, in New York City, local officials are taking a different approach to demand management. Mayor Zohran Mamdani has urged residents to keep thermostats at 78 degrees and delay the use of high-energy appliances until late at night or early morning. The extreme heat has also prompted transportation disruptions, with Amtrak warning that trains may need to operate at reduced speeds, and New Jersey Transit reporting expected delays due to heat-related equipment stress. Such operational slowdowns are common during extreme heat events, as high ambient temperatures can cause steel rails to expand, potentially leading to “sun kinks” that compromise track integrity.
Long-term Implications for Power Infrastructure
The current emergency highlights a broader tension between the rapid expansion of data centers and the capacity of the aging U.S. power grid. While PJM considers the use of backup generators a “last resort,” industry experts suggest this could become a more frequent necessity. As Abe Silverman, an energy expert, noted regarding the rising load projections: “The projections for data center loads dwarf the amount of data center load we have now.”
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The integration of high-density computing facilities has fundamentally altered the load profile for many utilities. Whereas residential demand follows a diurnal cycle, data centers often require a constant, 24/7 “baseload” power supply, which complicates grid balancing during periods of low renewable energy output or extreme temperature fluctuations. This structural shift has prompted grid operators to re-evaluate their interconnection queues, with many regions now considering stricter requirements for new data center projects to include onsite renewable generation or battery storage to mitigate their reliance on the regional transmission system.
For the remainder of the holiday weekend, grid operators remain on high alert. While the Department of Energy has issued similar emergency orders in the past—such as during the May heat wave and last winter’s storm—the scale of the current demand underscores the challenges of maintaining reliability in an era of increasingly frequent extreme weather events. The reliance on Section 202(c) orders, historically reserved for rare, catastrophic events, now appears to be transitioning into a recurring tool for managing the widening gap between peak electricity demand and dispatchable generation capacity.
