Staff members conduct on-grid adjustment and testing of the roof-mounted photovoltaic power system in the south railway station of Hangzhou, capital of east China's Zhejiang Province, June 29, 2017. The system, which covers about 52,000 square meters and has a total installed capacity of 4.2 megawatts, has passed quality acceptance on Thursday. The Hangzhou south railway station is expected to put into use at the end of 2017. (Xinhua/Huang Zongzhi)
