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KHIMTI
1HYDROPOWER PLANT
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Khimti
I Hydropower Plant is being built with private sector funding
as a "BOOT" agreement (Build, Own, Operate, and Transfer)
with HMGN. Construction commenced on 12 Asadh 2053 (26th June
1996) and the projected date of Commercial Operation is Asadh
masant 2057 (11th July 2000).
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Himal
Power Limited will operate the plant and sell electricity
to Nepal Electricity Authority (NEA). The banks and investors
will be repaid during the operation. The plant will then be
transferred to HMGN at the end of the 50 year license period.
At the end of the first Power Purchase Agreement the NEA will
purchase a 50% share in the Power Plant at Kirne for a nominal
fee.
The Plant
aims:
- to
develop Nepal's hydropower potential
- To
establish a medium scale hydropower plant in Eastern Nepal
- To
generate electricity for Nepal's national grid
- To
execute the plant in an environmentally friendly way
- To
mitigate impacts to the inhabitants in the plant area
- To
provide a mini-hydro plant for the local community at the
end of construction.
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The
plant is a "run of the river" hydro-electric power generation
plant designed for an installed generating capacity of 60,000
kilowatts and annual production of 350 million kilowatt-hours
of electrical energy (350 Gwh).
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The
site is located in Dolakha and Ramechhap District. The power
plant will utilise a drop from 1,270 to 586 meters above seal
level in Khimti River, a tributary to the Tama Koshi River
about 100 kilometres to the east of Kathmandu.
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Access
to the site is by the existing Jiri road 175 kilometres from
Kathmandu. HMGN has constructed a road (22 kilometres long)
from Nayapul to the power house site at Kirne.
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The
hydraulic works consists of a low diversion dam, which leads
the water through desanding chambers into the headrace tunnel.
The tunnel is 7,620 meters long with an 11.5 square meter
cross section, and ends in a surge chamber, from where a 898
meter long, 45 degree inclined penstock shaft, with steel
lining embedded in concrete, leads to the powerhouse. A 1,418-meter
long free flow tailrace tunnel with cross section of 15 square
meters brings the water into the Tama Koshi River. An 890-meter
long tunnel with a cross section of 22 square meters provides
access to the underground powerhouse at Kirne in the Tama
Koshi Valley, just upstream of the confluence with the Khimti
River.
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The
installation in the powerhouse consists of five double jet
Pelton turbines with runners fitted on the extended shaft
of the 12,000 kilowatts, 750 RPM alternators. The power is
transferred at 10.5 kilovolts from the generators through
the cables in the access tunnel to the outdoor transformers
where the voltage is stepped up to 138 kilovolts for the supply
to the national grid and to 33 kilovolts for the local supply
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