Alin B1 Hydropower Project (Phong Điền District, Thừa Thiên Huế Province) is a diversion-type hydropower plant owned by Công ty CP Thủy điện Trường Phú. The main reservoir is in the A Ling River basin west of the Trường Sơn Range, while the auxiliary reservoir is on the A Lin River east of the range. The reservoirs are connected by tunnel No. 1, approximately 4.4 km long. The water conveyance system on the auxiliary dam branch comprises an intake structure, a headrace channel 815 m long, free-flow headrace tunnel No. 2 with a length of 1262 m, a forebay, and a penstock 2.5 m in diameter and 750 m long. The powerhouse contains 02 vertical-shaft Francis turbine units with a total installed capacity of 46 MW and average annual generation of 162.3 million kWh. The plant has a relatively high maximum generating head (Hmax = 303 m) and a large penstock on steep terrain with complex geology. The project was completed and began generating electricity in 2019.
Contracting entity: Cty CP Thủy điện Trường Phú
Contract Nos.: 25/2010/HĐTV-AlinB1 and 18a/2015/HĐTV-THP-VCE
Scope of work:
- The project was divided into several design packages. VCE undertook surveys, technical design and shop drawings for the water conveyance and generation works from the forebay through the penstock, powerhouse, tailrace channel and 110 kV switchyard, as well as preparation of bidding documents.
- VCE also provided consultancy for construction supervision of headrace tunnels No. 1 and No. 2.
