Datang Environment Industry Group Co., Ltd. provides environmental protection and energy conservation solutions to coal-fired power generation enterprises in the People's Republic of China. It operates through the following segments: Environmental Protection and Energy Conservation Solutions, Renewable Energy Engineering, Thermal Power Engineering, and Other Businesses. The Environmental Protection and Energy Conservation Solutions segment engages in the flue gas desulfurization and denitrification facilities concession operation business for coal-fired power plants; manufactures and sells denitrification catalysts; and provides engineering services for coal-fired power plants, including denitrification, desulfurization, dust removal, ash and slag handling, other environmental protection facilities, and industrial site dust management solutions.