Full Breakdown
DOE Order Lets PJM Curtail Data Centers Amid Heatwave
5/20/2026, 12:53:24 AM
Emergency Order Authorizes PJM Curtailment
On Monday the U.S. Department of Energy issued an emergency order allowing PJM Interconnection to curtail data centers and other large-load customers with backup generation for up to three days starting May 18, as a last-resort measure before rolling blackouts.
Heatwave and Maintenance Stress Grid
Temperatures across PJM’s 13-state area have risen into the 90s, with Washington, D.C. forecast at 100 °F and New York City near 95 °F. Simultaneously, over 40 GW of generation is slated for spring maintenance, leaving reserves below 5,800 MW for the May 18 peak.
Key Players and Data Centers
PJM Interconnection implements the curtailment, while the Department of Energy provides authority. About 4,287 data centers—many in Virginia—are classified as large energy consumers with on-site backup generation, making them primary targets.
Load Forecasts and Price Surge
PJM projects peak loads of 134,027 MW, 135,961 MW and 119,103 MW over the three-day window. Planned outages will remove over 40 GW, while reserves stay under 5,800 MW. Wholesale prices rose 76 % to $136.53/MWh in Q1 2026, up from $77.78/MWh in Q1 2025.
Reliability, Consumer, Environmental Impact
Backup generation at data centers aims to prevent blackouts and lower grid stress, potentially saving lives. Yet AI-driven data-center growth has driven price spikes and created heat islands that can raise ambient temperatures by up to 16 °F, affecting millions.
Official Statements
PJM warned that generation outages combined with demand pose a significant reliability risk. The DOE said backup generation will reduce grid stress. PJM noted that rising wholesale prices reflect tightening supply and that it recognizes the impact of these costs on consumers.
Criticism
Analysts in the Independent report argue that rapid AI-focused data-center construction inflates electricity prices and strains the grid. Researchers warn the resulting heat-island effect could affect over 340 million people worldwide.
Verbatim Quotes
“The projected level of generation outages coupled with the forecasted demand raises a significant risk of emergency conditions that could jeopardize electric reliability and public safety,” — PJM Interconnection
“The employment of this backup generation is expected to reduce stress on the grid,” — U.S. Department of Energy
“Deployment of backup generation resources (whether auxiliary, standby, directly-connected, battery storage or other, and whether synchronized or not to the bulk power system) at data centers (including, but not limited to, hyperscaler facilities), and at other large load industrial and commercial customer sites, can prevent avoidable blackouts, thereby saving lives and reducing costs to the American people,” — U.S. Department of Energy
“PJM recognizes the impact of these costs on consumers,” — PJM spokesperson
Next Steps
PJM has activated pre-emergency demand-response for Baltimore Gas and Electric, Dominion Energy and Potomac Electric Power Co. to ease local constraints. The three-day curtailment will be monitored, and further demand-response actions may follow if reserves stay insufficient.
