Photo taken on May 17, 2011 shows windmill power generators in Rongcheng city, east China's Shandong province, May 16, 2011. The coastal Rongcheng city has attracted such large energy companies as Huaneng Group to invest wind power projects with the operational and under-construction installed capacity totaling 25,000 kW and accumulative electricity generation of 600 million kWh. (Xinhua/Guo Xulei)