Cuba had three electric grid collapses since Friday, and most of the country remains in the dark as slow progress is made to restore power.

Millions in Cuba faced another morning without power on Sunday following a third partial grid failure in two days, intensifying a crisis that has left residents struggling with blackouts and shortages. The latest collapse affected the western provinces, including Havana, where the entire capital was plunged into darkness overnight.

Cuba’s electrical grid went down Friday after one of the island’s major power plants failed, a day after a massive blackout swept across the Caribbean island and with no official estimate for when service will be restored.

As electricity was being restored in parts of Cuba following an island-wide blackout, a total collapse of the electrical grid occurred once again.