Mazar hydroelectric plant

Name of Project:

Mazar hydroelectric plant


Compañia de Generación Hidroelèctrica Paute - HIDROPAUTE S.A.

Construction period:
March 2005 - February 2011

The Mazar hydroelectric project is located in south-east Ecuador and is the second phase of the programme to exploit the energy potential of the middle section of the Río Paute.
The first phase was the Amaluza-Molino project, with an installed capacity of 1,075 MW, constructed by Impregilo S.p.A. and in operation since 1983.
The Mazar project will be constructed immediately upstream of the Amaluza reservoir and will have a capacity of 194 MW.

Dam and related structures
The dam is a concrete-faced rockfill dam, with a maximum height of 183 m from its foundations and a total volume of more than 5,000,000 m3. Construction involves excavation of a 1,241 m long, 12 m x 12 m cross-section diversion tunnel, partially concrete lined.
The dam has two separate spillways with a total discharge capacity of 7,500 m³/s, one controlled by a free fall weir and the other by a crest radial gate (15 m wide and 13 m high). It also has a bottom outlet consisting of a 403 m long concrete lined tunnel.

Underground structures
The main underground structures are:
A 384 m long power tunnel with a horseshoe-shaped cross-section and 6.30 m internal diameter.
A penstock principally consisting of a 60 m high vertical shaft, linked to a transition section and a 56 m long steel-lined penstock.
An underground powerhouse, 64 m long, 20 m wide and 39 m high, housing two 97 MW Francis turbines.
A vertical services shaft (transport, cables and lift) and a horseshoe-shaped section discharge tunnel, 8 m in diameter and 642 m long.

Open-air excavation: 4,700,000 m3
Dam embankment: 5,100,000 m3
Open-air concrete: 104,000 m3
Underground excavation: 200,000 m3
Underground concrete: 100,000 m3


Last update: 18/09/2013