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Lingza - Ministry of Power

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1.0 INTRODUCTION<br />

CHAPTER-I<br />

EXECUTIVE SUMMARY<br />

1<br />

Preliminary Feasibility Report<br />

<strong>Lingza</strong> HE Project (3 x 40 MW)<br />

The <strong>Lingza</strong> Hydroelectric Project located in North Sikkim district <strong>of</strong> Sikkim envisages<br />

utilization <strong>of</strong> the waters <strong>of</strong> the river Ringpi a tributary <strong>of</strong> river Rangyong for power<br />

generation on a run <strong>of</strong> river type development, harnessing a head <strong>of</strong> about 746m.<br />

The project with a proposed installation <strong>of</strong> 120MW (3 x 40MW) would afford an annual<br />

energy generation <strong>of</strong> 477.51 GWh in a 90% dependable year. The tariff from the project<br />

at present day cost would be Rs2.62 per KWh(levellised).<br />

The diversion site is located at Latitude 27º36’ North, Longitude 88º27’20” East. The<br />

dam site is approachable from Mangan-<strong>Lingza</strong> road by a footpath <strong>of</strong> 5km. The dam site is<br />

at a distance <strong>of</strong> about 7km from <strong>Lingza</strong> and about 24km from Mangan, the head quarter<br />

<strong>of</strong> North Sikkim district. The nearest railhead is at New Jalpaiguri and airport at<br />

Bagdogra.<br />

1.1 GENERAL PROJECT FEATURES<br />

The <strong>Lingza</strong> HE Project envisages construction <strong>of</strong> :<br />

• a 75 m high concrete Dam across river Ringpi to provide a live storage <strong>of</strong><br />

1.71mcum. with FRL at 1850m and MDDL at 1830m;<br />

• two intakes and two desilting chambers <strong>of</strong> size 95m(L)x5m(W)x7.5m(H) to<br />

remove silt particles <strong>of</strong> size 0.2mm and above;<br />

• a 4km long , 3.3m diameter head race tunnel terminating in a surge shaft;<br />

• a 40m high, 10m dia surge shaft;<br />

• 900m long, 2m dia one pressure shaft;<br />

• an underground power house having an installation <strong>of</strong> 3 Pelton turbine generating<br />

units <strong>of</strong> 40 MW each operating under a net head <strong>of</strong> 736m; and

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