India flash flood sparks questions on nation’s hydropower push

Environmentalists have urged the Indian government to review its policy of building hydropower dams in fast-warming mountain regions, after an apparent glacier collapse this week led to flooding that swept away one dam and left at least 26 people dead.

The Sunday flash flood in India’s northern Uttarakhand state, triggered by what scientists said they believed was a large avalanche of glacier ice and rock, left up to 200 people missing in the Himalaya region. Rescuers this week were racing to try to free dozens of dam construction workers trapped in a tunnel by debris carried by the wave of floodwater.

Scientists said the disaster was difficult to directly link to climate change in a region where landslides are common – though temperatures are rising faster in the Hindu Kush-Himalaya mountains than in other parts of the region. But Anil Kulkarni, a glacier expert at the Bengaluru-based Indian Institute of Science, said global warming and “local factors such as deforestation for developmental projects and large-scale construction activities could have contributed to the disaster”.

Continuing construction of hydropower dams in the region needs reconsideration, not just because of warming risks but because of broader environmental impacts, said Sunita Narain, head of the New Delhi-based Centre for Science and Environment. About 7,000 megawatts worth of hydroelectric projects are already operating or being constructed in the fragile mountains of Uttarakhand, she said.

The projects are going ahead as India tries to move to cleaner renewable energy and provide more power for development, including in more remote regions.

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