Untitled - Ministry of Power

Himalayas. The power house site is about 150
Km from the nearest railhead ( narrow gauge),
Shimla. The Project stretches over a length of
about 50 Km from the Dam site to the Power
House site, on the Hindustan-Tibet Road
(NH-22), which also connects the rail head
to the Project.
Project Salient Features
NJHEP consists of the following:
A 62.50 m. high concrete Dam on Satluj
river at Nathpa to divert 405 cumecs of
water through four Intakes.
An underground De-silting Complex,
comprising four chambers, each 525m
long, 16.31m. wide and 27.5 m. deep,
which is one of the largest underground
complexes for the generation of hydro-power
in the world.
A 10.15 m dia. and 27.39 km. long Head
Race Tunnel which is one of the longest
power tunnels in the world, terminating in a
21.6 m. / 10.2 m dia and 301 m. deep
Surge Shaft.
Three circular steel-lined Pressure Shafts,
each of 4.9m. dia. and 571m to 622m.
length, bifurcating near the Power House to
feed six generating units.
An underground Power House with a cavern
size of 222 m x 20 m x 49 m having six
Francis Turbine Units of 250 MW each to
utilise a design discharge of 405 cumecs
and a design head of 428 m.
A 10.15 m dia and 982 m long Tail Race
Tunnel to discharge the water back into the
river Satluj.
Project Benefits
Besides the social and economic upliftment of
the people in its vicinity with commissioning of
the 1500 MW NJHEP will generate 6950 MU of
electrical energy in a 90% dependable year.
It would also provide 1500 MW of valuable
peaking power to the Northern Grid.
Out of the total energy generated at the bus
bar, 12 percent is to be supplied free of cost to
the home state i.e. Himachal Pradesh. From
the remaining 88% energy generation, 25% is
95