Workers assemble solar panels at a wastewater treatment plant in Lianyungang, East China's Jiangsu Province on Sunday. The city's first solar power generation project that eyes utilizing photovoltaic energy as part of wastewater treatment is being built. The project is expected to generate up to 233,000 kilowatt hours of electricity per annum and reduce electricity costs by about 140,000 yuan ($21,613) annually. Photo: cnsphoto