Licensed project: Construction engineering construction; Construction engineering design; Installation, maintenance, and testing of transmission, power supply, and receiving power facilities (projects that require approval according to law can only be operated with the approval of relevant departments, and specific business projects shall be subject to the approval results) General projects: Technical services, technical development, technical consultation, technical exchange, technology transfer, and technology promotion; Sales of industrial automatic control system devices; Research and development of emerging energy technologies; Sales of photovoltaic equipment and components; Sales of power electronic components; Sales of mechanical parts and components; Contract energy management; Retail of hardware products; Labor services (excluding labor dispatch); Processing of mechanical parts and components; Manufacturing of general components; Sales of building materials; Sales of metal materials; Manufacturing of photovoltaic equipment and components; Technology import and export; Import and export of goods; Sales of rubber products; Import and export agency; Sales of mechanical and electrical equipment; Research and development of mechanical equipment; Sales of labor protection equipment (except for projects that require approval in accordance with the law, business activities shall be carried out independently with the business license in accordance with the law)