1.0 BACKGROUND
Tehri PSP has been envisaged to generate 1000 MW of peaking power for enhancing system reliability and also to provide balancing load to the thermal and renewable generation during off peak hours. The reservoir created by the Tehri Dam and Koteshwar Dam would function as upstream and downstream reservoir for Pump Storage Plant. This Plant will contribute in stabilization a big way by meet the peak load and balancing requirement.Tehri PSP comprising of four reversible pump turbine units of 250 MW each, involves construction of an Underground Machine Hall on the left bank of river Bhagirathi. The main feature of the Project is the large variation of about 90 m between the maximum and minimum head, under which the reversible units shall operate. The operation of Tehri PSP is based on the concept of recycling of water discharged between upper reservoir to lower reservoir. On completion, additional generating capacity of 1000 MW, peaking power, will be added to the Northern Region (annual generation of 2475 million units). For pumping operation of reversible units, the off-peak energy requirement will be of the order of 3104 MU. With the construction of Tehri PSP, Tehri Hydro power Complex shall function as a major peaking station having an installed capacity of 2400 MW.
2.0 PROJECT APPROVAL
Govt. of India approved the execution of Pumped Storage Plant (4X250 MW) in July-2006, at a cost of ₹1657.60 cr. including IDC of ₹81.64 cr. at Dec.’05 price level with debt equity ratio of 70:30.
3.0 REVISED COST ESTIMATE
RCE-I of ₹ 2978.86 at Apr’10 PL was approved in Nov’11. RCE-II of ₹ 4825.60 Cr. (incl. IDC & FC of ₹1089.80 Cr.) at Feb'2019 PL, has been approved on 31.07.2021.
Revised Cost Estimate-III: RCE-III at Jun’2023 PL has been prepared and submitted to CEA for approval. Proposal for Time over run is being examined in CEA.
4.0 Expected Commissioning of Project
1st and 2nd Unit are targeted to be completed by 15.03.2024 and 31.03.2024 respectively except constraint of River Joining.
