According to CNN:
The embattled head of Puerto Rico's power authority stepped down Friday, nearly two months after Hurricane Maria left much of the island without electricity.
Ricardo Ramos, executive director of the Puerto Rico Electric Power Authority, known as PREPA, submitted his resignation to the bankrupt utility's board. It was effective immediately, according to PREPA.
He stepped down days after Puerto Rico's governor declared that power generation had reached 50% capacity, only to see an outage leave parts of San Juan without power for hours. It was the second outage in as many weeks.