Three planned gas-to-power projects in Southern Vietnam will require USD 5.5 billion in investments during the next six years, a senior executive from Vietnam Oil & Gas Co., or PetroVietnam, has said. Natural gas from fields offshore Vietnam will feed power plants, fertiliser projects, and industry, PetroVietnam Vice President for Exploration and Production Tran Canh said. He spoke on the sidelines of a conference organised by the ASEAN Council on Petroleum, or Ascope.