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.

Cuba has suffered a massive power outage affecting Havana and the country’s provinces that has left millions in the dark.

The lights were out across all of Havana's waterfront skyline, a Reuters witness observed, with only a scattered few tourist hotels operating on fuel-fired generators. Reports on social media from outlying provinces both east and west of the capital city suggested much of the country of 10 million people was without power.