The 519-km-long line has an investment capital of over VND22.3 trillion (US$896.8 million), comprising four sections, including Quang Trach - Quynh Luu, Quynh Luu - Thanh Hoa, Thanh Hoa - Nam Dinh 1 thermal power plant, and Nam Dinh 1 thermal power plant - Pho Noi.
The 500 kV transmission line project from Nam Dinh 1 Thermal Power Plant to Thanh Hoa was operational on June 30; the Nam Dinh 1 Thermal Power Plant - Pho Noi and Quynh Luu – Thanh Hoa sections completed on Aug. 18; and the Quang Trach - Quynh Luu section on Aug. 27.
The projects are consider crucial in increasing the transmission capacity through the 500 kV system from central to northern Vietnam from the current 2,500 MW to 5,000 MW.
They will help improve the stability of the power system, boost electricity supply for the north in 2025 and the following years, and reduce the risk of overload and congestion in existing 500 kV lines and stations, thus contributing to ensuring national energy security.