Aerial photo shows a view of Lianghekou hydropower plant on the Yalong River in Tibetan Autonomous Prefecture of Garze, southwest China's Sichuan Province. With the last 500,000-kW power generation unit officially putting into use, a mega hydropower plant built at an average altitude of 3,000 meters, the highest one of its kind in China, went fully operational on Friday. (Photo provided to China News Service)