HAVANA, Cuba (AFP) — Power was restored across Cuba on Friday following a large-scale blackout, but the island's energy crisis remained acute, with oil supplies tapped out. The Caribbean island of 9.6 million people, under a United States (US) energy blockade since January, has suffered critically low energy supplies in recent days. Some 65 per cent of Cuban territory endured simultaneous blackouts on Tuesday, data compiled by AFP showed.