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Project Detail:
TARALI PSH envisages construction of Upper reservoir and use the existing TARALI reservoir as lower reservoir and the required quantum of water for power generation will get stored in the upper reservoir through seasonal flow of water in the tributary/nala whenever it is available.
The Pumped Storage Project envisages construction of:
? 50 m long approach channel from Upper reservoir terminating at intake structure at 1060 m RL. Approach channel 70 m wide, will accommodate two intake structures, one each for the two Head Race Tunnels
? From intake to Surge shaft two Head Race Tunnels (HRT) 460 m long, one of 10m dia, for Units 1 to 3 and the other of 8 m diameter for Units 4 to 6 will be constructed with appropriate stop logs and gates. From intake the tunnel drops down to EL 1030m
? Each HRT will terminate into its own Surge shaft. Each surge shaft will be 90m height but with different diameters, as per hydraulic requirement
? From the Surge shaft, pressure shafts will take off. Pressure shaft for Units 1 to 3 (combined) will be of 8.3m diameter and that for Units 4, 5 & 6(combined) will be 6.8 m in diameter. The pressure shafts, because of internal water pressure, will be steel plate lined. Because of structural design requirements, Pressure shafts will bifurcate into smaller diameter branches, as they slope down towards the powerhouse. Total length of each pressure shaft, from each Surge shaft to the powerhouse, will be about 1690m long. Normally in hydro the numbering of units start from left bank to right bank as seen in the direction of water flow. Since here it is about pump turbines, the numbering can be any way.
? Well shaft and cavern type Powerhouse.
? TRT 2 X 8.7m dia about 200 m long from DT gallery to Lower reservoir
? An Approach Channel 70 m wide and 1000 m long in Tarali reservoir to carry water to TRT Outfalls (Pump Intakes) during pumping mode operation.
? Alternate layouts as given annexure VI and other potential cost effective layouts like buried and concertized penstocks, if any, will be evaluated in detail during DPR
Note: Please Download Project Document attached to this Project for more information.
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