Yuncan Hydropower Project

Yuncan Hydropower Project


Huallamayo, Peru

The Yuncán Hydropower Project is located in the Province and Department of Pasco, 200 miles Northeast of Lima, Peru.


The Yuncán Hydropower Project, in the Eastern Andes of Peru, includes 16 miles of tunnel,
two concrete gravity dams, and an underground powerhouse.

The project includes two concrete gravity dams that divert water from the Paucartambo and Huachón rivers. The water will flow through 16 miles of tunnels before reaching the underground powerhouse. The project is expected to provide 133 MW of power.

The project has encountered numerous difficulties. Headrace Tunnel Number 4 collapsed on the head of the tunnel-boring machine (TBM), requiring a rescue tunnel bypass to be built. Headrace tunnel number 2 encountered a buried valley with associated poor ground conditions. Tunnel number 1 has had to deal with significant water inflows, which have slowed mining and muck transport. Water inflow has also caused problems and delays in other areas of the project.

Because of both political delays and geological difficulties, the contractor had submitted a large number of claims.

Deere &Ault Consultants, Inc. staff were hired to analyze and evaluate eight specific claims in regards to validity and true costs. Deere &Ault’s staff had previously been retained to advise the client on the TBM collapse and associated bypass tunnel.

Numerous claims were made by the Contractor, and Deere &Ault served as expert witnesses for the Peruvian Government.

Client:  Empresa de Generación de Energia Eléctrica del Centro S.A.

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