All of Puerto Rico lost power Wednesday, the Associated Press reports, six months after Hurricane Maria devastated the island and ravaged the nation’s unstable power grid. The Puerto Rico Electric Power Authority is investigating the cause, while officials say that it could take 24 to 36 hours to restore electricity to more than 1.4 million customers.
A series of power outages has hit Puerto Rico in recent months, but the current blackout marks the first island-wide blackout since Hurricane Maria struck on September 20. The last outage occurred just last week, when two electric lines failed and left 840,000 customers without electricity. Across the island, 40,000 customers continue to be without electricity since the hurricane made landfall.
The Electric Power Authority is prioritizing restoring power to hospitals, the Luis Muñoz Marín International Airport, pumping systems for the Puerto Rico Aqueducts and Sewers Authority, and central banks, according to a Twitter post.