Cuba’s power grid failed Friday night, leaving millions of the island nation’s 10 million residents in the dark. The outage, which began around 8 p.m. Eastern time, affected most of western Cuba, including the capital of Havana. Cuba has struggled with blackouts in recent months, including a nationwide one in December. Power was still out early Saturday morning; officials gave no estimation of when it would be restored. In October, a dayslong power outage forced some in Havana to resort to cooking over improvised stoves in the street.