The collapse follows nationwide blackouts last year that plunged Cuba's frail power-generating system into disarray.

A widespread blackout left millions of Cubans without electricity for a second consecutive night Saturday, marking the island's fourth major outage

Havana plunged into darkness as Cuba's power grid collapsed, leaving millions without electricity. Efforts to restore power were hampered by setbacks, impacting vital services. Most Cubans endure prolonged blackouts amid economic strain.