Production and sales of energy-saving transformers, medium-voltage gas-insulated switchgear cabinets, high- and low-voltage switchgear cabinets and accessories, high- and low-voltage complete equipment, high- and low-voltage electrical components, box-type substation equipment, cable trays, busways, and metal products; general contracting, installation, repair, testing, design, and technical services for power engineering; construction of water conservancy and hydropower projects, fire protection projects, and power transmission and transformation projects; leasing of power equipment and vehicles; sales of wires, cables, and electrical materials; construction labor subcontracting.