The project consists in the construction of a 9.4 MW Hydroelectric Plant. The plant consists of:

• A lateral intake equipped with trash racks, settling basin and forebay tank,
• A steel penstock, 6250 m long, 3 diameters (2.2 – 2.1- 2.0 m)
• A powerhouse with 2 Francis turbine units, total power equal to 9.4 MW
• A service road 6400 m long

Scope of services

The Alpina mandate includes the preparation of the Basic and Detailed Design for construction of the all the civil and hydromechanical works.

• Review of the existing data and studies provided to the Client by previous consultant. This activity includes the review of specifications and design criteria in order to achieve the feasibility of the construction.
• Evaluation of Energy production for different water supply scenarios.
• Selection of penstock diameter.
• Design of all civil works.
• Design of the penstocks.
• Design of the powerhouses.
• Design of excavations and temporary supports
• Services and construction of temporary infrastructures necessary for the works.

Engineering Services for the preparation of the Basic and Detailed Design Projects of Nakra 1&2 HPP

The project consists in the construction of a 8.7 MW cascade Hydroelectric Plant. The plants consist of:

Nakra 1

• A lateral intake equipped with trash racks, settling basin and forebay tank
• A steel penstock, 1680 m long, 2 diameters (1.3 – 1.2 m)
• A powerhouse with 2 Francis turbine units 3.7 MW
• A service road 1680 m long

Nakra 2

• A lateral intake equipped with trash racks, settling basin and forebay tank,
• A steel penstock, 1900 m long, 2 diameters (1.3 – 1.4 m)
• A powerhouse with 2 Francis turbine units 5.0 MW
• A service road 1900 m long

Blanco hydroelectric plant is located in Chile, Bio-Bio region, Alto Bio-Bio municipality.

The Blanco plant works with 1 mᶟ/s of flow and it is mainly composed by a weir, a 3,2 km and 700 mm diameter adduction pipe, a penstock, a powerhouse with a one Pelton turbine of 2,4 MW output and a discharge channel.

Alpina developed the entire hydraulic, structural and geotechnical design for the runoff river plant.

Detail design of the El Pinar hydroelectric plant in Chile, Yungay municipality on the Cholguan River.

The El Pinar plant works with 7 m³/s of flow and it is mainly composed by a weir, a 1.7 km adduction tunnel followed by a 5.6 km and 2000 mm diameter HDPE adduction pipe. The penstock is made of a 400 m steel pipe, with a 1400 mm diameter, partially buried and partially exposed.

The powerhouse has two turbines: a Pelton and a Francis with a total power output of 11 MW. A discharge channel provides the restitution of waters to the river.

The Romagna waterworks derives its waters from Ridracoli Lake located in the municipality of Bagno di Romagna (FO).An arch-gravity dam (103,5 high with a crest length of 432 m) is built on Bidente river.Purpose: water distribution to the associated municipalities such as Forlì, Cesena, Ravenna.

The project includes:

Type :    arch gravity dam

Total reservoir capacity :       33.000.000 m³
High :  106 m

Total concrete volume :  600.000 m³

High pressure pipe line:         33 km; 1.400 mm
Installed Power  :     7 MW

Water treatment Plant :    3,6 m³/s