Cuba’s national power grid (SEN, in Spanish) is gradually being restored following the country’s second total energy collapse of the year, an incident whose causes remain unidentified by authorities, the Electric Union of Cuba (UNE, in Spanish) reported Tuesday.

In Havana, 26 distribution circuits have been reconnected, restoring power to 78,692 customers—approximately 9.1 percent of the capital’s population. Twenty-two hospitals across the city are now operating normally.

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The Matanzas province has seen more than 66,000 customers regain service. Restoration efforts have also reached Las Tunas and Santiago de Cuba, both operating on isolated micro-systems.

Officials warned the public to expect unstable power flow throughout the national reconnection process and appealed for understanding amid the widespread outage affecting the island.

The recovery operation faces significant challenges due to fuel shortages amid the U.S. blockade, resulting in intermittent blackouts across multiple circuits lasting between one and twelve hours.

The Electric Union reiterated that crews continue working around the clock to stabilize the system and restore service nationwide.

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