Czech Republic hit by major power outage triggered by fallen cable

A widespread power outage struck large parts of the Czech Republic, including the capital Prague, on Friday (4 July), disrupting public transport, trapping people in elevators, and idling factories after a high-voltage cable fell, destabilizing the national power grid.

The incident, which was nearly resolved by 1600 GMT, has heightened concerns about the fragility of Europe’s aging power infrastructure, particularly following Spain’s historic blackout in April 2025 and a fire-induced outage at London’s Heathrow Airport in March 2025.

The outage, which began around 12:00 pm (1000 GMT), affected Prague and regions in the northern and eastern Czech Republic, according to the Czech Industry and Trade Ministry.

“There was a massive power outage in part of Prague and in the northern and eastern Czech Republic,” the ministry stated. “The cause was the fall of a power cable, not a cyberattack nor a failure of renewable resources.”

The incident disrupted international and local train services, halted Prague’s underground metro system, and stopped trams for several hours. Approximately 1,000 mobile phone network stations were impacted, relying on backup systems to maintain operations.

The national transmission system operator, CEPS, declared a state of emergency after the V411 transmission grid line in the northwest and Unit 6 of the Ledvice power plant failed. The cause of the cable’s collapse remains unclear, but it led to cascading effects, overburdening another line and substation, and isolating part of the grid from the broader European network.

Spain’s historic blackout and Europe’s grid vulnerabilities

The Czech outage comes on the heels of Spain’s worst-ever blackout in April 2025, which left millions without power for days and exposed significant vulnerabilities in Europe’s power infrastructure.

The Spanish blackout, triggered by a combination of extreme weather and an overloaded grid, disrupted hospitals, businesses, and transportation networks, causing widespread economic and social impacts. Analysts attributed the crisis to an aging grid ill-equipped to handle surging electricity demand and the integration of intermittent renewable energy sources like wind and solar.

The incident prompted urgent calls for investment in grid modernization and energy storage solutions across the European Union Europe’s power grid, much of which was built decades ago, faces increasing strain from rising electricity consumption, driven by the electrification of transport, heating, and industry, as well as the rapid expansion of renewable energy.

The International Energy Agency (IEA) estimates that Europe will need to invest over $3 trillion by 2050 to upgrade its grid and bolster energy storage to meet net-zero carbon goals while ensuring reliability.

Recent incidents, including the Czech outage and a fire that disrupted power to London’s Heathrow Airport in March 2025, underscore the risks of underinvestment. The Heathrow outage, caused by a fire at a substation, disrupted flights and highlighted how even localized failures can have far-reaching consequences.

In the Czech Republic, the fallen V411 line serves an industrial region with lignite power plants and is part of a modernization plan to double its capacity by 2028. However, the incident revealed how a single point of failure – a fallen cable – can cascade through an interconnected system.

The Ledvice 6 power plant, a 660-megawatt coal-fired facility operated by CEZ and built in 2017, was also affected, though CEZ provided no immediate comment on the plant’s status. The outage impacted eight of the country’s dozens of substations, which convert electricity into usable voltages, causing blackouts across five of the Czech Republic’s 14 regions.

Restoration efforts and immediate impacts

CEPS reported that all affected substations regained power by 1300 GMT, but distribution companies worked for hours to restore supplies to all customers.

Prime Minister Petr Fiala noted that around 500,000 customers were initially affected, with about 2,000 still without power by 1600 GMT.

The outage caused 215 incidents of people trapped in elevators, all of whom were safely rescued, according to fire brigade spokesperson Lucie Pipis.

Thirteen prisons lost power, though security was maintained, and three major Prague hospitals temporarily operated on backup systems.

Orlen Unipetrol’s refinery and chemical plant in Litvinov underwent an emergency shutdown and began a multi-day restart process after power was restored.

What experts say

Analysts warn that the region’s aging infrastructure is increasingly vulnerable to extreme weather, physical failures, and growing demand. The transition to renewable energy, while critical for climate goals, introduces challenges due to the intermittent nature of wind and solar power, requiring robust storage and grid flexibility.

The European Network of Transmission System Operators for Electricity (ENTSO-E) has called for accelerated investments in smart grids, energy storage, and cross-border interconnections to enhance reliability.

Experts argue that Europe must prioritise grid upgrades, including digital monitoring systems to detect faults early and decentralized energy solutions to reduce reliance on vulnerable high-voltage lines. As Europe accelerates its transition to a greener energy future, ensuring the stability of its power networks will be critical to avoiding further disruptions and maintaining public trust.

With Reuters, edited by g.g.

Caption: Illustrative phto. A high voltage substation in Rezekne, Latvia, 8 February 2025. EPA/VALDA KALNINA