Business scope includes general projects: Heat production and supply; Cooling service; Operation efficiency evaluation service; Contract energy management; Solid waste management; Energy saving management services; Sales of coal and products; Solar heat utilization equipment sales; Coal washing; General mechanical equipment installation services; Sewage treatment and its recycling; Sales of photovoltaic equipment and components; Pump and vacuum equipment sales; Coal flue gas desulfurization denitration equipment sales; Industrial control computer and system sales; Mechanical and electrical equipment sales; Mining machinery sales; Refrigeration, air conditioning equipment sales; Internet of Things equipment sales; Software development; Oil and gas technology services; Solar power technology services; Energy storage technology services; Hardware products wholesale; Fire sealing material sales; Synthetic materials sales; Cement products sales; Metal material sales; Doors and Windows sales; Construction of metal doors and Windows; Metal structure sales; Sales of seals; Sales of construction machinery; Sales of ecological environment materials; Building waterproof coil product sales; Sales of building materials; Handling