Guodian Nanjing Automation Co., Ltd. engages in the manufacture and sale of industrial power automation equipment in China and internationally. The company offers relay protection products, including high and medium and low relay protection products, security and stability control, and power plant electrical products; automation and communication equipment, which include substation automation, distribution network automation, and system auxiliary equipment products; smart primary devices, comprising online monitoring, transformers, and switch complete equipment; rail transit automation products; and energy information technology products, as well as water resources and hydropower products, energy saving and environmental protection products, including water treatment, frequency conversion, and ESP products; and new energy products, which comprise prefabricated and box type substation products, reactive power, compensation, and inverter products. It also offers high and low voltage switches and various control panels; security systems and products, intelligent products, services, and system integration; environmental protection, engineering construction, and equipment installation; imports and exports businesses of mechanical and electrical products; software and IT services; and equipment, instrumentation, spare parts, and technology services. The company was founded in 1940 and is based in Nanjing, China. Guodian Nanjing Automation Co., Ltd. operates as a subsidiary of Huadian Corporation Nanjing Electric Power Automation Equipment Co., Ltd.