The first generating plant at the 9.6 billion yuan (HK$12.1 billion) Zangmu Hydropower Station, which stands more than 3,300 metres above sea level, went into operation on Sunday, Xinhua said.
It will have a total generating capacity of 510,000 kilowatts.
“The hydropower station will solve Tibet’s power shortage, especially in the winter,” Xinhua quoted an official from Tibet Electric Power Company as saying.
India has previously expressed concern about damming the Brahmaputra, one of the largest Himalayan rivers and a lifeline to some of India’s remote, farm-dependent northeastern states.
India’s Foreign Ministry last year urged China “to ensure that the interests of downstream states are not harmed by any activities in upstream areas” of the river after state media reports that China planned several more dams there.
Indian Foreign Ministry spokesman Syed Akbaruddin said yesterday that New Delhi had been aware the dam was “coming up”.
“The Chinese have told us that it should have no implications for us,” he said.
Dam construction in China has been blamed for reduced flow and sudden flooding on the Mekong River, which flows into Southeast Asia, claims Beijing has denied.
Foreign Ministry spokeswoman Hua Chunying told reporters: “The hydropower stations China builds will not affect the flood prevention and ecological system of downstream areas.”