Millions of people in Cuba are without power after a failure of the nation’s electric grid left the island in the dark.

The grid failed on Friday evening about 8:15pm (00:15 GMT) after a breakdown at Diezmero substation in the capital, Havana, kicked off a chain reaction that shut down power generation across the island, according to officials at operator Union Electrica (UNE).

Cuba‘s electric grid collapsed late Friday leading to a nationwide power outage and leaving millions in the dark. At around 8:15 p.m., an outage at the Diezmero substation in Havana caused “a significant loss of generation in western Cuba and,