Jenniffer González Colón has been sworn in as Puerto Rico’s new governor as the island prepared for a normally ebullient ceremony overshadowed by widespread anger over a blackout that hit the U.S. territory days ago.

Nearly half of the island’s 1.4 million utility customers had power by late Tuesday night. The electricity provider said it would take up to 48 hours to fully restore service.

A major power outage plunged much of Puerto Rico into darkness on New Year's Eve, with the US island territory's electric utility saying restoration could take up to two days.