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 on Saturday said that some electricity was 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.

Millions of Cubans remain without electricity because of a prolonged outage at the main power plants on the island.