Fidel Castro once called Cuba’s power plants “prehistoric.” But the country still relies on them, contributing to the longest blackout since the collapse of its former patron, the Soviet Union.

Cuba’s government says some electricity has been restored on the island after one of the country’s major power plants failed and left millions without electricity in an outage that started two days earlier.

Some electricity has been restored in Cuba following the island nation’s most severe blackout in at least two years, which left millions without powe