Turning global warming into opportunity, melting Himalayan glacier is harnessed for electricity
From the edge of the terminal moraine of the Langtang Lirung Glacier, there is a 360 degree view of icy peaks, and below is the monastery town of Kyanjin blanketed in overnight snow.
Towering above is Langtang Lirung with snow being blown off its 7,227m summit, with the jagged peaks of Kimshun standing like bodyguards with Tserko Ri, Yala Peak and Gang Chhenpo. And to the south is the rampart of the Naya Kanga ridge.
“When I was a boy we brought the yaks up here to graze, and they could cross the ice from one side of the glacier to the other,” says Gyalbu Tamang. “This lake was formed only in the last 20 years.”
The glacial lake is located at 4,100m from which water is channeled to the powerhouse.
As climate change thaws the mountains, right across the eastern Himalaya in Nepal, Bhutan and southern Tibet, hundreds of new lakes have formed at the snouts of glaciers. Some have found outlets and emptied themselves, while others, like this one, swelled up dangerously.
In the past 40 years, there have been 26 glacial lake outburst floods on Nepal’s rivers, and with newer and bigger lakes forming, they pose a serious risk to new roads, settlements and hydropower plants downstream.
However, glacial lakes do not just need to be a threat, as has been shown by a unique project on the Langtang Lirung Glacier. This glacial lake at 4,100m is being drained to lower its level, and the water is used to generate electricity.
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