A BRIEF INTRODUCTION TO KOYNA HYDROELECTRIC POWER PLANT

1. KOYNA Hydroelectric
Power Plant
Presented by
Uzma Shaikh(MT17WRE011)
VNIT NAGPUR

2. Introduction
• The Koyna Hydroelectric Project is the largest completed
hydroelectric power plant in Satara district of
Maharashtra ,India
• The project is operated under MSEB.
• It is composed of FOUR Dams with major contributors
being The Koyna dam and Kolkewadi dam.
• The total installed capacity of the project is 1960 MW
which consists of FOUR stages of power generation.

3. • Basin Krishna , west flowing rivers from Tapi
to Tadri.
• Total Projects cost  4,953 Crore Rupees
• Purpose Irrigation , Hydroelectric power
generation and flood control.

4. Description
• Stage 1 & 2
– The 1st and 2nd stages share same powerhouse with
total eight Pelton turbine units.
– Each of the two stages has four turbines having capacity
of 75 MW each
– A dam foot powerhouse was also constructed which is
used to generate electricity by the water which is
discharged from the Koyna Dam for irrigation purpose. It
has two Francis turbine units of 20 MW each

5. • Stage 3
– Later it was observed that the water coming out of tail
race tunnel of Stage I and II had a hydraulic head of
about 120 m which could be used.
– In this stage electricity is generated by four Francis
turbine units with a capacity of 80 MW each.
– The tail race water from these stages then flows
through a channel and joins the Arabian Sea near
Chiplun.

6. • Stage 4
– In 1980, the electricity demand of the Maharashtra
increased tremendously resulting in inadequate
power supply
– The Planning Commission accorded approval to Stage
IV with installation capacity of 4 × 250 MW.
– This scheme also draws water from the existing
shivsagar reservoir.
– thus converting the Koyna Power Station into a
peaking power station complex with load factor of
about 18.7%

8. • Lake Tapping
– A nonconventional intake system was created by
piercing the lake from the bottom by blasting the rock
plug using dynamite.
– Explosive used for the lake tapping were specially
bought from Denmark.
– The first lake tapping was done successfully in 1999
which produces 65TMC water and second lake tapping
was done on 26th April 2012 and water rose upto 15 ft
high creating waves.

9. Koyna HE Lake Tapping

11. Thank you

12. Reference
• www.mahagenco.in
• www.india.wris.nrsc.gov.in
• NHPC