KOYNA HYDROELECTRIC POWER PLANT

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 S atara district of M aharashtra ,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 R upees 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. I n 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 I n 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%

7. 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 26 th April 2012 and water rose upto 15 ft high creating waves.

8. Koyna HE Lake Tapping

9. Thank you

10. Reference www.mahagenco.in www.india.wris.nrsc.gov.in NHPC