Technicians watch the first generator unit operating in Xiluodu hydropower station, which is located on the lower reach of Jinsha River between Leibo county of Sichuan province and Yongshan county of Yunnan province, both in Southwest China, July 14, 2013. The first generator unit "13F" went into formal operation on Monday after a three-day trial. The hydropower plant will be the second largest one ranking only second to the Three Gorges when all of its 18 units go into operation in 2014.[Photo/Xinhua]