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)

A worker lifts the windmill generator for installation in Shandong Rongchuan Port Machinery Manufacturing Co., Ltd. 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)

Workers examine windmill hubs in Shandong Rongchuan Port Machinery Manufacturing Co., Ltd. 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)

A worker stablizes the stator of a windmill generator in Shandong Rongchuan Port Machinery Manufacturing Co., Ltd. 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)