(VEN) - Historical records of the power sector show that in 1954, when French forces left Vietnam, the physical infrastructure in the north consisted of five power plants with total capacity not exceeding 31.5MW and total power output of about 53 million kWh a year. By 1975, these figures stood at 451MW and 1,264 billion kWh a year, respectively. The power system was mainly used for industrial production and important services in big cities.