Cuba said on Wednesday it would keep schools closed and non-essential workers home through Sunday as the crisis-racked Caribbean island nation struggled to recover from the collapse of its power grid last Friday and Hurricane Oscar this week.

Cuba’s electrical grid went down Friday after one of the island’s major power plants failed, a day after a massive blackout swept across the Caribbean island and with no official estimate for when service will be restored.

Cuba made fast progress restoring power to swaths of the Caribbean island nation on Tuesday, both in Havana and outlying provinces, even as emergency and grid workers struggled to reach areas ravaged by Tropical Storm Oscar.