A small town in far eastern Cuba is recovering from flooding that killed at least six people after Hurricane Oscar crossed the island's eastern coast as a tropical storm with winds and heavy rain.

Cuba's power-grid operator said it had restored electricity to parts of Havana on Monday following multiple grid collapses over the past four days, while Tropical Storm Oscar lashed the island's eastern end.

Electricity outages have paralyzed an already-crippled economy, leading to shortages of everything from cash to running water.