PJM Tightens Power Use Under Federal Alert

PJM, the largest power grid operator in the United States, is operating under a federal alert to reduce electricity consumption across its territory as it contends with extreme heat. The operator coordinates power for about 67 million people in the Mid-Atlantic, parts of the South and Washington, D.C., an area experiencing prolonged sweltering temperatures that have driven up electricity use.

The alert reflects mounting stress on the system, as high temperatures push air-conditioning demand to elevated levels during peak hours. PJM is responding with a set of emergency actions intended to keep the grid stable and maintain service during this period of unusual strain.

To manage the situation, PJM has instructed utilities to reduce electricity to customers who are under contract to lower consumption during emergencies. These demand-response arrangements allow the grid operator to quickly curtail load from participating customers when reliability is at risk.

The grid is simultaneously facing generator outages and massive overloading on high-voltage transmission lines. These factors, combined with surging air-conditioning use, have tightened available capacity and made it more challenging to move power across the region where it is needed most.

Market prices for electricity have reacted sharply to the stress on the system. Spot wholesale power prices in northern Virginia, home to a large concentration of data centers, have surged beyond $2,000 per megawatt hour this week.

In more typical conditions, when PJM is not under distress, wholesale prices are around $40 per MWh. The jump signals both the intensity of demand and the limited supply and transmission headroom currently available in that part of the grid.

The emergency actions are aimed at preventing blackouts while maintaining service to residential users and other critical customers. By tapping contracted load reductions and calling for conservation under a federal alert, PJM seeks to balance supply and demand without resorting to more disruptive measures.

System operators are working to manage constrained transmission paths and limited reserves as the heat wave persists. The combination of conservation efforts, contractual demand response and careful operational management is central to keeping the large regional grid functioning reliably under current conditions.