The entire island of Puerto Rico lost power on Wednesday in what is the country’s biggest power outage since Hurricane Maria devastated the island seven months ago, according to Buzzfeed News.

Puerto Rico Electric Power Authority (PREPA,) which is responsible for generating electricity for the island, announced the news on Twitter saying that it could take up to three days for power to be restored to everyone.

PREPA’s interim director Justo González confirmed that U.S. private contractor Cobra Energy caused the blackout by hitting a transmission line with a crane, USA Today reports.

The same company caused a massive outage last week that left 840,000 people without power.