Koyna Stage IV Hydroelectric Project

The Koyna Hydroelectric Plant, a branch of the Krishna Basin, is a concrete dam 103.2 m above the foundation, built on the Koyna River, in Satara district, Maharashtra state, India. It is the second-largest hydroelectric project in the country and impounds water to generate 1960 MW in four phases. The power plant was established in the year 1966 with the first two phases; Due to the increase in demand, the power plant was expanded with a new stage with a capacity of 1000 MW, called "Stage-IV". The installed capacity of this stage alone is 1000 Mw. This stage is mostly used to cater for the peak hour demands of the electric grid.

The power plant uses water coming from the Koyna River for phases I, II, and IV. In Phase-IV, water is drawn directly from the reservoir in the Head Race Tunnel of length 4230 m and delivered to the Head Surge Tank.

Encardio-rite was awarded the sub-contract for supply as well as installation of safety monitoring instrumentation for the project in 2010. The instrumentation included: