Power outages are a frustratingly frequent occurrence for many Puerto Ricans. A string of blackouts during the summer prompted protests and a state of emergency.

A “massive blackout” that hit much of Puerto Rico early Tuesday may keep the U.S. territory in the dark through New Year’s Eve and beyond, according to the governor and the private energy company that provides power to the island.

Puerto Rico suffered the latest in a string of widespread power outages Tuesday that has left 1.3 million customers, some 80% of the entire island, in the dark.