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.

An island-wide blackout in Puerto Rico Tuesday left more than 1 million residents without power ahead of New Year's Eve celebrations, with crews working for hours throughout the day to get the lights back on.