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Fallen Transmission Line Causes Major July 4 Blackout in Czech Republic

Emergency crews restored electricity to most affected regions in under 30 minutes.

Trams are immobilized during a major power outage in Prague, Czech Republic, July 4, 2025. CTK/Ptacek Jan via REUTERS
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Overview

  • A collapsed high-voltage line at noon cut power across five of the country’s 14 districts and brought Prague’s trains and trams to a halt.
  • Prague’s transport authority said subway lines A and C were back in service within 15 minutes and line B resumed operations after 30 minutes.
  • Most tram routes and regional train services were restored under the same rapid-response protocols within half an hour of the outage.
  • Grid operator CEPS and government investigators have excluded cyber or terrorist attacks and are examining the physical cause of the line’s failure.
  • Officials warn the incident underscores vulnerabilities in Europe’s interconnected power networks and the need for strengthened resilience measures.