Cuba nationwide grid collapse follows high-voltage transmission line failure

On 18 September 2026, at around 14:00 local time, Cuba's national electrical grid suffered a total collapse after a failure affecting high-voltage transmission lines in the central part of the country. The failure left millions of people without electricity across the island. Cuba's National Electrical Union initiated procedures to gradually restore the system. By late evening, power had been returned to several areas of Havana, primarily around hospitals, while much of the capital remained without electricity. The event was the latest in a series of major grid failures during 2026, with the country having experienced at least six partial or total system collapses since January, including three in July alone. Restoration work was reported as continuing following the failure.

The grid has been under sustained pressure from fuel shortages and ageing infrastructure, which the source identifies as underlying causes of repeated system collapses during 2026.

1. Ageing transmission infrastructure without adequate reinvestment increases the risk of cascading, nationwide failures.
2. Prioritising restoration of power to critical facilities such as hospitals during large-scale outages helps limit harm to vulnerable populations.
3. Repeated partial or total grid collapses within a short period indicate systemic vulnerability that requires structural investment rather than only emergency response measures.

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