In order to implement the Huinco Power Station, the Callahuanca plant had to be built. It is located in the Callahuanca Gorge, by the Santa Eulalia River.
The plant aimed to make the most out of the lakes in the drainage basin of the Santa Eulalia River through new accumulation and control devices.
Construction began in March 1934. 1,200 men undertook the manifold and complex task of channelling the water, installing the pressurised pipes and building the engine room.
The plant was completed in late March 1938. After many tests, the Callahuanca Power Station was finally inaugurated on 7 May.
In 2005, the plant was repowered through the change of three turbines, thereby increasing the effective capacity by more than 5 MW.
Installed capacity: 80 MW
Effective capacity: 84.2 MW
Average annual generation: 600 GWh
Flow rate: 23 m3/sec
Gross head: 435 m
Turbine: Horizontal shaft Pelton
Number of units: 4
Commissioning (first unit): 1938
Location: 52.5 km east of Lima. District of Callahuanca, Province of Huarochirí, Department of Lima.
Type: Run-of-the-river power station. Water comes from the Rímac and Santa Eulalia Rivers.