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 electrical grid collapsed again early on Saturday morning, state-run media reported, plunging the entire country into blackout for a second time just hours after authorities announced they had begun reestablishing service.

Millions of people in Cuba were left without electricity for two days after the nation’s energy grid went down when one of the island’s major power plants failed. The widespread blackout that swept across the county was the worst in years.