Hurricane Oscar's arrival to eastern Cuba Sunday has impacted millions of residents already facing days without power, as fresh attempts to restore much of the nation's electric grid have failed.

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 national grid collapsed on Friday, leaving the entire population of 10 million people without electricity and underscoring the precarious state of the Communist-run country's infrastructure and economy.