Koyna Hydro-electric Project

PPT on Koyna Hydro-electric project, SST- Water Resources, Class10

1. Koyna Hydroelectric Project Name: Agrodwip Das Class: 10 D Roll no.: 18

2. Introduction

3. The koyana Dam is one of the largest dams in Maharashtra, India. It is a rubble- concrete dam constructed on koyana River which rises in Mahabaleshwar, a hillstation in Sahyadri ranges. It is located in koyana Nagar, Satara district, nestled in the Western Ghats on the state highway between Chiplun and Karad.
The main purpose of dam is hydroelectricity with some irrigation. Koyana Hydroelectric Project is the largest completed hydroelectric power plant in India having a total installed capacity of 1,920 MW. Due to its electricity generating potential koyana river is considered as the ‘life line of Maharashtra.

4. In the early 20 th century, there was a survey of the koyana River as hydro-electric source by the Tata Group.
The 1928 financial crisis caused the project
to be shelved. After the independence of India, it was taken
over by the Government of Maharashtra. In 1951 koyana Dam Division started to look into the project. The project was approved in 1953 and work commenced in early 1954 and completed in 1962.

5. Features Type of dam-Rubble-concrete dam

Impounds-Koyna River Height-103.2 m (339 ft)

Length-807.2 m (2,648 ft)

Reservoir Creates –Shivajisagar Lake

Total capacity -2,797,400,000 m³ (2,267,900 acre. Ft)

Surface area-891.78 km² (344 sq mi)

6. Hydro-electric project

7. >The koyana Hydroelectric Project is the largest completed hydroelectric power plant in India.

> It is a complex project with four dams including the largest dam on the koyana River known as the koyana Dam hence the name koyana Hydroelectric Project.

>The project site is in Satara district near Patan. The village Helwak near the dam was later known as koyananagar.

> The total capacity of the project is 1,960 MW.

> The project consists of four stages of powergeneration.

>All the generators are located in underground powerhouses excavated deep inside the mountains of the Western Ghats.

>A dam foot powerhouse also contributes to the electricity generation. > The project takes advantage of the height of Western Ghats. Thus a very large hydraulic head is available over a very short distance.

8. Stage l and ll 1 st and 2 nd stages share same powerhouse with total eight Pelton turbine units.

- Capacity- four turbines having of 65 MW each for 1 st stage and 75 MW each for 2 nd stage.

The water from The shivajisagar reservoir is taken through an intake structure known as Navja tower near village of Navja into the head race tunnel.

> Then it travels towards the surge tank. It is further divided into four pressure shafts which run vertically downward delivering water to the turbines.

Then the water is discharged into the tail race tunnel.

9. > A dam foot powerhouse was also constructed which is used to generate electricity by the water which is discharged from the koyana Dam for irrigation purpose.

>It has two Francis turbine units of 20 MW each. This powerhouse is run according to the irrigation requirements of the downstream areas. 17-18/41

> The combined installed capacity of the two

>stages and the dam foot powerhouse is
600 MW.

10. Stage lll and Vl >It was observed that the water still had a hydraulic head of about 120 m which could be used. >To use this head, the Kolkewadi Dam was constructed at this location.

>It forms a balancing reservoir and maintains head.

>This dam impounds the tail race water from Stage I and II. This water is drawn through penstocks and

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 .

The installed generating capacity of this stage is 320 MW

11. >Later in the 1980s, 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 x 250 MW. Thus, one more stage called Stage IV was introduced, thus converting the koyana Power Station into a peaking power station complex with load factor of about 18.7%.

>This scheme also draws water from the existing shivajisagar reservoir same as Stages I and II.

12. Future Plans To utilize more water from the shivajisagar reservoir, another dam foot powerhouse is being constructed on the left bank of the dam.

This powerhouse will employ a pumped storage scheme. Also lake tapping is proposed for the intake system.

13. Thanks! Please keep this slide for attribution