Nanyang Feilong Electric Power Group Co., Ltd. and Nanyang Electric Power Bureau (State Grid Henan Electric Power Company Nanyang Power Supply Company) are the same company.
According to (Tianyancha) inquiry, Nanyang Feilong Electric Power Group Co., Ltd. is an enterprise group mainly engaged in power construction and installation, survey and design, production and sales of wind power electrical products, with its headquarters Located in southwest Henan. The company has 4 subsidiaries and 19 branches (including 10 county branches), mainly engaged in the construction and installation of power projects of 500 kV and below, survey and design, power supply services, wind power generation, electrical product manufacturing and sales, etc. business. The company has more than 6,800 employees. Nanyang Electric Power Bureau, namely Nanyang Power Supply Company of State Grid Henan Electric Power Company, is the same company as Nanyang Feilong Electric Power Group Co., Ltd. and is responsible for the power supply and management tasks within Nanyang City.
As far as I know, the construction units are usually found by the wind farms themselves through bidding, and they are usually local ones, because this will make it more convenient for construction and recruitment of personnel.
General construction and installation units have construction qualifications, but most of them are those with electric power construction qualifications.
In fact, railway electrification units all have power construction teams. All China Railway bureaus have them.