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 blackout hit nearly all of Puerto Rico early on Tuesday as the U.S. territory prepared to celebrate New Year’s, leaving more than 1.3 million clients in the dark. Officials said it could take up to two days to restore power.

A critical failure in Puerto Rico’s power grid has caused a massive blackout affecting a large part of the island, according to a post on Gov. Pedro Pierluisi’s X account.