Manufacturing and sales of high and low voltage complete switchgear equipment, control equipment, power and control transformers, generator sets, wires, cables, steel structures, and cement prefabricated structural parts; sales and installation of solar photovoltaic products, vehicle charging pile devices, electric energy storage products, air conditioners, and ventilation ducts; sales of hardware electrical materials, mechanical and electrical products, chemical products, metal materials, and decorative materials; leasing of mechanical equipment, houses, and vehicles; machining; loading and unloading services; construction labor service operations; electricity sales; power technology consulting services; design of power transmission and transformation projects and supporting civil engineering; professional contracting of mechanical and electrical equipment installation projects; installation (repair, testing) of power facilities.