Critics say China's turbines will harm environment
YAMDROK LAKE, TIBET
Small waves lap against the barren, rocky shore here at pristine Yamdrok Lake. Sitting at nearly 15,000 feet in the Himalayas, the vast lake is a holy site to Tibetan Buddhists.
Along the shore, pilgrims have created intricate monuments of small, carved rocks. Prayer flags flutter in the constant wind. For centuries the lake has remained undamaged by humans.
Now, however, the Chinese government is building a highly controversial hydroelectric project at the lake.
Critics charge that the Yamdrok Tso hydroelectric station will pollute the lake and lower its water level.
Chinese officials say they are using the latest Western technology to guarantee the lake's ecology. "We made a thorough survey of all the environmental needs," says Liu Hong Ping, chief of Tibet's Environmental Bureau. "We found there would be no harm to the environment."
This reporter was the first foreign journalist allowed to visit the project, now under construction 75 miles southwest of Lhasa.
After the hydroelectric plant goes on line, water will drain from the lake into a pipeline, drop 2,755 feet, pass by turbines to generate electricity and then flow into the Yarlung Tsampo river.
Elin, an Austrian company, and Voith Hydro Inc. of the United States are contractors at the site. Voith has supplied equipment for 177 similar pump-storage hydro facilities worldwide.
System for peak demand
Pump storage means that after peak electrical usage times, turbines shut down and electricity from another source pumps the water back up the same pipeline into the lake. The water at Yamdrok Tso will be pumped up three times a day, according to officials, and the lake will face no decrease in water levels.
Slightly more energy is expended pumping the water back up than is generated at the turbines. But pump storage plants are practical because they provide energy at critical times of peak use.
"It makes sense financially because the power [to return the water uphill] is less expensive at non-peak times," says Voith spokeswoman Diane Lear.
If the project functions as planned, it will provide up to 112,500 kilowatts of electricity to the Lhasa area, power needed to alleviate nightly blackouts in parts of the capital and to build up industry.
Critics question the environmental impact of a pump storage plant in Tibet's fragile environment. Pumping silty water up from the river below will "definitely pollute the lake," says Rinchen Dharlo, an American aide to the Dalai Lama, Tibet's religious leader. "It is one of our most beautiful lakes."