Cuba's electrical grid collapsed Sunday for the fourth time in 48 hours, a major setback in the efforts to restore power to exhausted residents.

Millions remain without power in Cuba for a third consecutive day as slow progress is made in restoring electricity following three major grid failures.

The center in Miami said the storm’s center arrived in the Cuban province of Guantanamo, near the city of Baracoa, on Sunday evening. Its maximum sustained winds were near 80 mph.