Northeast Electric Development Co., Ltd. (formerly Northeast Transmission and Transformation Machinery Manufacturing Co., Ltd.) is a limited company established through targeted fund-raising with the approval of the Shenyang Enterprise System Reform Commission (1992), by the Northeast Transmission and Transformation Equipment Group as the main sponsor. The company's main business is R&D, design, production and sales of products related to power transmission and transformation equipment, as well as the hotel, catering and lodging business. The company's main products are closed bus lines, which are mainly used in the field of power systems to improve the transmission efficiency of transmission lines and support the transmission of high-power electric energy. They are important equipment for power systems.