HEC

1. Location:Na Hang district, Tuyen Quang province

2. Stage: Technical design stage 1 and 2
3. Consultant: Power Engineering Consultants Company No.1 (PECC1)
4. Project Owner: EVN
5. Project scale and tasks:

- Tasks:

+ Flood control with storage capacity of 1 billion m³;

+ Power generation: installed capacity of 342MW, annual average power output: 1,295x10⁶KWh.
- Scale:

+ CFRD. Maximum dam height: 124.5m; dam length: 99.5m;

+ Spillway: 4 gates (15 x 15.15 ) m ; 8 bottom outlets (4.5 x 6); Q = 0.02%: 12,736 m³/s
6. Appraisal time: 02 months

This is the second largest hydropower project in the North with total investment cost of CND 7,500 billion. The FS of the project was approved by the Government on 19/04/2002, the project was commenced on 22/12/2002.

Parameters of the project:
- Dam length along crest: 717.9 m;

- Maximum dam height: 92.2 m;

- Dam crest width: 10 m
- Normal water level: 36 m;

- Reservoir storage capacity: 2,245 billion m³;

- Number of unit: 3;

- Design capacity: 342 MW
- Dam type: CFRD;

- Construction time: 5 years;

- Excavation and filling quantity: 13 million m3 rock and soil;

- Concrete placement: 950x 10³ m³
- Grouting drilling length: 101x10³ m ;

- Equipment installation: ~ 15 x 10³ ton