Cuba’s power grid collapsed Friday night, triggering a nationwide power outage and plunging its more than 10 million people into darkness.

Millions of people in Cuba remained without power Saturday after a failure of the nation’s electric grid left the island in the dark the previous night. The massive blackout is the fourth in the last six months as a severe economic crisis plagues the Caribbean country.

HAVANA (AP) — Electricity service in Cuba was gradually restored Sunday, more than 36 hours after a substation failure left the entire island in the dark.