HYDROPOWER PLANNING OF KRISHNA RIVER

Country: India State: Karnataka/Bijapur District Capacity: 1080 MW
Year: Client: Kvaerner Boving/The Asia Power Company Energy:  4800 GWh
SECSD are the original planners and designers of the Narayanpur-Tamankal cascade development.

The Narayanpur Dam is a balancing reservoir located on Krishna river downstream of the main storage at Almatti Dam. From Narayanpur Dam, the main canals take off for providing irrigation to the vast lands of Bijapur district. Downstream of Narayanpur Dam, the Krishna river flows for a distance of 50km in Karnataka state before it enters  Andhra Pradesh.

A proposal was conceived by the state utility Karnataka Power Corporation  for the development of this stretch of the river by diverting the flows at Narayanpur into a 70km long power canal designed to carry  800 cumecs discharge to an underground power house with an installed capacity of  1000 MW at Lingsugur.  The construction period was in excess of 10 years. The proposed power canal is equivalent to constructing a river for 70km to divert the Krishna river flow to the power house.

SECSD were instated by Energy Secretary of Karnataka to examine whether an alternative to develop the hydropower potential of this stretch was possible so as to make the project suitable for IPPs. 

LOCATION MAP

SECSD applied techno economic planning principles effectively and demonstrated how to develop the stretch of the river with minimum civil works so as to reduce costs and shorten construction period such that the projects may be attractive to private investors.

Through an innovative approach it was proposed to split the original single stage development into five nearly identical stages with a total installed capacity of 1080 MW and called   Narayanpur-Tamankal cascade development.

SINGLE STAGE DEVELOPMENT BY KPCL

CASCADE DEVELOPMENT BY SECSD

The advantage of the cascade is that construction of all the stages can be initiated simultaneously and completed in 3 years instead of 10 years for the KPCL proposal.

The planning by SECSD used the existing topography to maximum advantage which resulted in the reduction in length of canals to 5km, use of local materials for simple dams,  elimination of underground power house and forebay, and avoiding transients in 80km canal.

STAGE P (MW) E (GWh)
1 180 945
2 180 950
3 180 1000
4 180 1000
5 180 1000
TOTAL 1080 4895

NARAYANPUR DAM

STAGE-3

FALLS

BRAIDED FLOW

STAGE - 2 FALLS

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