Milestones in the development the power system in Vietnam


  • Construction of the first 35 kV power line in the North

In January 1958, the first 35 kV power line (Hanoi – Pho Noi) was built and in the third quarter of the same year was inaugurated and successfully energized. This was a remarkable milestone in the development of the Vietnam power network.

  • Construction of the first large scale thermal power plant in the North


On May 19, 1961 construction of Uong Bi Thermal Power Plant project with a capacity of 48 MW commenced. This was a key project of the State, the largest thermal power plant and a principal generation source in the North at that time. Afterwards, the power plant was uprated to 153 MW and 300 MW, respectively.

  • Construction of the first 110 kV transmission line in the North


In Quarter III of 1962,  construction of the first 110 kV transmission line project in the North (Dong Anh – Viet Tri, Uong Bi – Hai Phong) commenced and by the fourth quarter of 1963 the project was completed  and energized. Nine out of twelve power plants were synchronized with the 110 kV power grid, creating a complete power system in the North.


  • Construction of the first large scale hydropower plant in the North

On August 19, 1964, construction of 108 MW Thac Ba Hydropower Plant project  commenced (Yen Bai) . This was the first large hydro power plant in Vietnam.

  • Construction of the first 220 kV transmission line in the North

In March 1979, construction of Ha Dong – Hoa Binh 220 kV transmission line project commenced and put into operation in May 1981. This was the first 220 kV transmission line in the North, enhancing transmission capacity, supplying electricity and creating technical foundation for construction of the North – South 500 kV ultra high voltage transmission line afterwards.

  • Construction of Hoa Binh Hydropower Plant, “project of the century”


On November 6, 1979, construction of Hoa Binh Hydropower Plant project commenced with 8 units and the total capacity of 1,920 MW. In the decades1980s and 1990s , Hoa Binh Hydropower Plant project was considered as the world – class “project of the century”  of the country. At the project inauguration time, (December 1994),  Hoa Binh Hydropower Plant produced more than 21.366 billion kWh, accounting for 46% of the total national generation output.


  • Construction of North-South 500 kV ultra high voltage transmission line project  

On April 5,  1992, construction of  North-South 500 kV transmission line project – circuit 1 commenced  (with a length of nearly 1,500 km from Hoa Binh to Phu Lam). On May 27, 1994, the first ultra high voltage transmission line was energized and inaugurated. Since then, the national power system has been formed on the basis of interconnection of the regional power grids in the North, the Centre, and in the South through  the 500 kV “backbone” transmission grid.

On October 23, 2005, 500 kV transmission line – circuit 2 was completed and put into operation, forming two ultra – high voltage transmission lines in parallel throughout the country, enabling two-way power flows  between the North and the South, enhancing the safety and quality of the electric power supply of the whole power system.

On May 5, 2014,  500 kV transmission line – circuit 3 (Pleiku – My Phuoc – Cau Bong) was inaugurated. The transmission line was 445 km long, passing through 6 provinces and cities (Gia Lai, Dak Lak, Dak Nong, Binh Phuoc, Binh Duong and Ho Chi Minh City), ensuring the safe and economical operation of the power system in case of  exchanging energy at a high level amongst regions across the country.

  • Construction of the largest power complex in the whole country


On April 10, 2005 Phu My Power Complex was inaugurated, comprising 6 power plants with a total installed capacity of 3,859 MW,  two times as large as the capacity of Hoa Binh Hydropower Plant. Among them, Phu My 1, Phu My 2.1, Phu My  2.1 Extension and Phu My 4 power plants are owned by EVN. Phu My 3 and Phu My 2.2 power plants are foreign BOT projects.

  • Construction of the largest hydroelectric power plant in South East Asia


On December 2, 2005 Vietnam commenced constructing Son La Hydropower Plant – the largest hydropower project in South East Asia at that time with an installed capacity of 2,400 MW. With a total investment cost of nearly VND 60,196 billion, it was the largest hydropower project in the country in terms of  capacity, investment cost and number of resettled households. The project was inaugurated and put into operation on  December 23, 2012  three years ahead of the original schedule stated by the National Assembly, benefiting the country about USD 1 billion..

  • Construction of submarine cable projects to connect island districts to the national grid  

Vietnam  Electricity has supplied electric power to 11 out of 12 island districts including: Van Don, Co To (Quang Ninh Province); Cat Hai, Bach Long Vy (Hai Phong Province),  Ly Son (Quang Ngai Province), Phu Quy (Binh Thuan Province); Con Dao (Ba Ria-Vung Tau Province), Phu Quoc, Kien Hai (Kien Giang Province), Spratly Islands (Khanh Hoa Province) and Con Co Island (Quang Tri Province).

Among which:

. Phu Quy, Con Dao,  Bach Long Vy and Spratly island districts are powered by on-site sources.

. The remaining districts are connected to the national power grid.

One island district that have not been supplied electricity by EVN is Paracel Islands.


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