A five-year-old boy and his mother, along with a 92-year-old man, are among the six people dead after Hurricane Oscar hit the coastal city of Baracoa and nearby areas in the eastern province of Guantánamo in Cuba as a Category 1 storm on Sunday, bringing heavy rains and flash flooding in a region that has been without electricity since Friday.

Fidel Castro once called Cuba’s power plants “prehistoric.” But the country still relies on them, contributing to the longest blackout since the collapse of its former patron, the Soviet Union.