PJM grid voltage disturbance
Analysis based on 7 articles · First reported Jul 22, 2026 · Last updated Jul 23, 2026
The event underscores grid vulnerability to sudden demand drops from data centers and crypto miners, potentially increasing regulatory scrutiny and costs for these industries. Utility stocks may face short-term volatility, but no lasting market impact is expected.
On July 22, 2026, a massive power disconnection occurred on the PJM Interconnection, the largest U.S. electric grid, causing a voltage disturbance felt from Washington, D.C., to Chicago. The event originated in northern Virginia, home to the world's largest data center hub, when a transmission line went out of service, causing data centers to switch to backup power. Over 3 gigawatts of demand went offline (about 3% of grid demand). PJM reported no reliability impacts, but stabilization took about 10 minutes. Dominion Energy confirmed the cause and said it stabilized the situation. The incident highlights regulatory concerns about grid stability from data centers and crypto miners.
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