India utility commissions 510-MW Teesta 5

National Hydroelectric Power Corp. (NHPC) reported the commissioning March 29 of all three units of the 510-MW Teesta Stage 5 hydroelectric project on the Teesta River in India’s Sikkim State.

NHPC said one 170-MW unit was placed in commercial service with the remaining two to follow shortly. The 26.5 billion rupee (US$665 million) project is to generate 2.5 billion kilowatt-hours annually for sale under a provisional tariff at 1.62 rupees (4 U.S. cents) per kWh. The run-of-river Teesta 5 is the first of six hydropower projects to be commissioned in a cascade on the Teesta River in East Sikkim District. (HNN 3/20/06) Late last year, another developer, Teesta Urja Ltd., awarded a contract to equip the 1,200-MW Teesta Stage 3 project. (HNN 12/20/07)

In 2002, NHPC awarded a US$12.4 million contract to Texmaco Ltd. of India to supply hydro-mechanical equipment for Teesta 5. The project includes a 96.45-meter-tall, 182.5-meter-long concrete gravity dam, a 9.5-meter-diameter, 17.1-kilometer-long headrace tunnel, 92-meter-tall surge shaft, three pressure shafts, an underground powerhouse, and three tailrace tunnels.

Under a 2000 agreement with Sikkim State, 12 percent of Teesta 5’s energy is to be provided to Sikkim free of charge or sold on the state’s behalf by NHPC.

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