With the upgrade now in operation, the Pho Noi 500kV Substation is set to enhance power supply reliability for Hung Yen Province, the southeastern part of Hanoi, and surrounding areas, beginning in this year’s dry season.

On the morning of March 25, 2026, the National Power Transmission Corporation (EVNNPT), together with the Power Transmission Project Management Board (NPTPMB), coordinated with the National Power System Operation and Electricity Market Company Limited (NSMO) and relevant units to successfully energize the Pho Noi 500kV Substation Power Upgrade Project.

This is a special-grade, Group B energy project, with EVNNPT as the investor, NPTPMB representing the investor in project management and implementation, and Power Transmission Company No. 1 assigned for operation. The project is carried out within the existing substation premises in Dai Dong Commune, Hung Yen Province.

Participating units witnessing energization of project. Photo: Le Linh

The Pho Noi 500kV Substation plays a critical role in supplying electricity to Hung Yen Province, the southeastern area of Hanoi, and nearby localities. Prior to the upgrade, the substation often operated at more than 90% of its capacity, at times reaching up to 97%, posing a high risk of overload during peak demand periods, especially in hot weather.

The upgrade project includes the installation of a new 500kV–900MVA transformer (AT5) and the conversion of the existing 500kV–600MVA transformer (AT1) into standby operation. As a result, the total capacity of the substation has been increased from 1,500MVA to 1,800MVA. In addition, the project completes associated components such as 500kV and 220kV bays, busbar systems, and other synchronized technical infrastructure to match the expanded capacity.

Construction commenced on November 20, 2025, with continuous operations carried out in three shifts and four teams. By March 23, 2026, the project had been completed and approved for energization by the investor’s acceptance council. It was officially energized on March 25, 2026, ahead of EVNNPT’s original schedule for the second quarter of 2026.

By Le Linh – EVNNPT