Puerto Rico's hurricane-battered power grid has suffered compounding crises including hurricanes and financial problems.

The blackout in Puerto Rico occurred after a transmission line failed and caused generators across the island to protectively shut down, officials say,

Power was restored to 98.8% of clients early Friday after an island-wide blackout hit Puerto earlier this week, authorities said. More than 1.45 million customers had electricity less than 48 hours after the outage hit,