Tropical Storm Oscar doused Cuba on Monday, three days after a massive power failure plunged more than 10 million people into the dark as the island worked to restore its decades-old power grid.

Cuba's government said on Saturday it had made some progress in gradually re-establishing electrical service across the island, including to hospitals and parts of the capital Havana, after state-run media earlier reported the national grid had collapsed for a second time in 24 hours.

Cuba's power grid has ground to a halt for a second time in as many days, leaving 10 million on the island without power and the Caribbean island in a growing sense of crisis.