(CNN) - The head of Puerto Rico's embattled power authority, Walter Higgins, has resigned.
Governor Ricardi Rossello announced the departure on Twitter.
Higgins was just appointed CEO in March. Rossello tweeted Higgins had to step down for personal reasons.
FEMA says Puerto Rico has faced the longest-lasting power outage in modern U.S. history in the wake of Hurricane Maria, which wiped out the power grid in September.
It still faces an immense challenge in rebuilding a grid never built to withstand a Category 4 or 5 hurricane.
Under a power authority that is nine billion dollar in debt.
As of Monday, 13,000 people are still without power on the island as a result of Maria and the recent Tropical Storm Beryl.
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