Cuba's power-grid operator said it had restored electricity to most of the capital Havana on Monday even as Tropical Storm Oscar lashed the island's eastern end, downing trees and power lines.

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 has repeatedly failed to bring its electrical grid back up as a result of fuel shortages and deteriorating infrastructure, threatening a social explosion.

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.

Cuba's power-grid operator said it had restored electricity to parts of the capital Havana on Monday following a fourth major grid failure in 48 hours, while Tropical Storm Oscar lashed the island's eastern end.

Many Cubans waited in anguish Sunday as electricity on much of the island had yet to be restored days after an island-wide blackout. Their concerns were also raised as Hurricane Oscar made landfall in the southeastern Bahamas and was heading toward their country.

The majority of Cubans remain without power for the third day in a row after fresh attempts to restore electricity failed overnight

Cuba said it was making headway restoring power on Sunday after multiple false starts, though millions of people remain without electricity more than two days after the grid's initial collapse. The clock was ticking as Hurricane Oscar bore down on the Caribbean island on Sunday,