NAHB Chairman Randy Noel said nearly all of the structures in Puerto Rico that withstood hurricane-force winds still suffered major window and roof damage. NAHB

CURBED's Lauren Ro reports that on Wednesday—six months after Hurricane Maria devastated the island and ravaged its unstable power grid—all of Puerto Rico is again without power. The Puerto Rico Electric Power Authority is investigating the cause, and officials say that it could take 24 to 36 hours to restore electricity to more than 1.4 million affected 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.

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