<img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221110151120/636d08e79c7e80680e0a6045jpeg.jpg" alt="" width="640" height="426"/>Nepal Electricity Authority (NEA) and Citizens Investment Fund have entered a tripartite agreement with Tamakosi Hydropower Company to invest in the 99.8MW Tama Kosi V. They will foot 70% of the Rs16.19 billion cost, the rest will come via public shareholders.Tama Kosi V is part of the cascade plan of the nearby 456MW Upper Tama Kosi project that will be building dams and sand dredging structures for it. Gates to transport water from the Upper Tama Kosi powerhouse to Tama Kosi V tunnels have already been completed. The project is expected to be completed by 2027, with pre-construction work already underway.

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Tama Kosi V

<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/2022111015118/636d06359c7e80680e0a5f4ejpeg.jpg" alt="" width="1920" height="1080"/><figcaption>The Kosi Barrage on the Indian border where the river funnels out into the inland delta in Bihar.</figcaption></figure><ul><li>Three decades after it was first proposed, a 26.5km tunnel starts supplying water from Melamchi to Kathmandu.</li> <li>A <a href="https://www.nepalitimes.com/banner/drones-to-the-rescue-in-melamchi/" data-saferedirecturl="https://www.google.com/url?q=https://www.nepalitimes.com/banner/drones-to-the-rescue-in-melamchi/&amp;source=gmail&amp;ust=1625725666191000&amp;usg=AFQjCNEISH8LehEm5nAihrdyEOSDxSXsUg">deadly flood</a> on the Melamchi-Indrawati in Sindhupalchok on 16 June kills at least 27 people, and destroys infrastructure.</li> <li>The much-delayed 465MW Upper Tama Kosi hydropower plant starts feeding electricity to the national grid.</li> <li>SJVN says it has completed half the work on the 900MW Arun III project and the Investment Board awarded it another contract to develop the 679MW Lower Arun as well.</li> <li>Work has begun on the Sunkosi-Marin Diversion, to channel water to the Bagmati Basin and irrigate much of Province 2.</li></ul>All five events have one thing in common: they are all on the trans-boundary Kosi Basin that drains 75,000 sq km of territory in China, Nepal and India.Last week, I was standing on the Pati Bhanjyang ridgeline at the northeastern rim of Kathmandu Valley. Pour a glass of water on one side, and it flows westwards into the Gandaki River Basin. On the other side the streams drain into the Melamchi, which meets the Indrawati, then the Bhote Kosi to become the Sun Kosi that flows 200km eastward until it merges with the Arun and Tamor to form the Sapta Kosi.At that point, the river makes a tight turn south to tumble into the Kosi megafan in the Tarai and Bihar to finally to join the Ganga at Kursela. The Kosi, in fact, is the largest tributary of the Ganges, bigger than the Gandaki, Karnali, Jamuna, and even bigger than the Ganga itself as it debouches into the plains at Haridwar.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/2022111015118/636d06389c7e80680e0a5f4fjpeg.jpg" alt="" width="1920" height="1080"><figcaption> </figcaption></figure>The Kosi’s origin in Nepal is near Kathmandu. But it largest tributary, the Arun, originates in Tibet where it is called the Phung Chu, makes a mighty arc in Tibet and cuts through the Himalaya between Mt Makalu and Mt Kangchenjunga to meet its siblings Sun Kosi and Tamor at Tribeni.Geologists say rivers like the Arun that slice through the Himalaya are older than the mountains, and cut their way through as the terrain rose over millions of years with the collision of the India and Eurasian tectonic plates.The Kosi watershed therefore drains an enormous vertical landscape stretching from Mt Xixapangma which lies just 80km on the other side of the Himalaya in China, both sides of Mt Gauri Shankar (Chomo Tseringma), Mt Everest and Mt Makalu, as well as the western slopes of Kangchenjunga. Six of the world’s 13 peaks above 8,000m are therefore a part of the Kosi catchment.These mountains block the monsoons, and in eastern Nepal their southern slopes get more than 3,000mm of rain a year, weathering them down relentlessly, making the sedimentation load of the Kosi the heaviest for any river in the world.The topography of this mighty river has shaped Nepal’s history and culture, and can determine the country’s future prosperity as well. But only if we respect its geology, hydrology and the climate of its basin.Watershed expert Madhukar Upadhyay says, “We have not even begun to understand the hydrological and geological specificities of our mountains and rivers and yet are rushing headlong into ever-larger infrastructure development. Nepalis will still be here 500 years from now, what kind of country and landscape are we leaving behind for them?”Last month, landslides blocked the Melamchi-Indrawati, unleashing a deadly debris flow that destroyed infrastructure, homes and livelihoods. It imperilled <a href="https://www.nepalitimes.com/here-now/light-at-the-end-of-the-melamchi-tunnel/" data-saferedirecturl="https://www.google.com/url?q=https://www.nepalitimes.com/here-now/light-at-the-end-of-the-melamchi-tunnel/&amp;source=gmail&amp;ust=1625725666191000&amp;usg=AFQjCNEaXQ5HnjB92xgkbHBEnnbl5xiwow">the Melamchi project</a>, and its tunnel supplying water to Kathmandu was saved only because the gates were closed for maintenance just hours before the onrush.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/2022111015118/636d063c9c7e80680e0a5f50jpeg.jpg" alt="" width="1920" height="1080"><figcaption> </figcaption></figure>This week, the Upper Tama Kosi project started generating electricity, that will provide one-third of Nepal’s total power demand. But there was a scare just days before the inauguration: China informed Nepal that a massive landslide had blocked the river upstream, threatening the Rs55 billion project. Fortunately, the river found its way around the blockage. The near escapes of the Melamchi and Upper Tama Kosi sites make us take Upadhyay’s warnings seriously.Other <a href="https://www.nepalitimes.com/latest/monsoon-hits-nepal-with-a-bang/" data-saferedirecturl="https://www.google.com/url?q=https://www.nepalitimes.com/latest/monsoon-hits-nepal-with-a-bang/&amp;source=gmail&amp;ust=1625725666191000&amp;usg=AFQjCNHkbbDluGypXbbgC1BQxVAVndFTvA">flash floods this year </a>in Manang, Kaski and Lamjung also showed that while our rivers hold great promise, we ignore the risk to settlements and major infrastructure along their banks. Our engineering methods have been inherited from the West, and do not account for cloudbursts and extreme Himalayan weather events. All these risks have been exacerbated by climate change.In Melamchi, the power of the flood last month is evident in the steel hulk of the Indrawati Bridge that lies crumpled in the muddy river 100m downstream amidst room-sized boulders. The new sand bank is 25m thick, indicating the flood’s maximum height.It is not clear what happened, for a bishyari or two (bursting of a landslide-damming of the river) would not be enough to generate such a massive debris flow. Some speculate there may have been centuries-old glacial deposits which suddenly got released through a combination of earthquake weakening and heavy rain.We also saw that <a href="https://www.nepalitimes.com/banner/after-the-deluge-in-nepal/" data-saferedirecturl="https://www.google.com/url?q=https://www.nepalitimes.com/banner/after-the-deluge-in-nepal/&amp;source=gmail&amp;ust=1625725666191000&amp;usg=AFQjCNFAaYeK5lUf9eY4-j8mOHnFIUOT5A">Melamchi Bazar </a>had expanded into the river’s flood plain, with buildings in place of rice paddies, which added to the loss of life and property. Less than a month after the disaster excavators and tipper trucks are already on the Indrawati river bed, scooping up sand and boulders to feed Kathmandu Valley’s voracious appetite for construction material.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/2022111015118/636d06409c7e80680e0a5f51jpeg.jpg" alt="" width="1920" height="1080"><figcaption> </figcaption></figure>It is the Kosi’s Melamchi tributary that augments Kathmandu’s water supply, while the sand and boulders from the Indrawati, Sun Kosi, Bhote Kosi and Rosi fulfil the Valley’s demand for sand and aggregates.While earthquakes, floods and landslides are seen as ‘natural disasters’, and indeed they are to some extent, they become ‘man-made’ calamities with unregulated sand-mining of rivers, quarrying on steep slopes, and haphazard road-building.The highway along the Indrawati is crowded with sand-laden tipper trucks bound for Kathmandu. Downstream towards the Kosi Barrage along the BP Highway, the road follows the river past the site where a part of the Sun Kosi is to be channeled through a 13km tunnel to irrigate farmlands in the Tarai of Province 2. A similar inter-basin diversion scheme on the Kali Gandaki is now pitting Gandaki vs Lumbini Province, and the central government.We finally get to the new bridge across the Sapta Kosi at Chhatara, connecting Udayapur and Sunsari districts. This is exactly the point where, after its epic journey from the Tibetan Plateau and between the highest mountains in the world, this great river fans out into the plains.https://youtu.be/34lmOgPv-zkNorth of the bridge is the site of the proposed mammoth <a href="http://archive.nepalitimes.com/news.php?id=2413#.YOQRoi8RoWo" data-saferedirecturl="https://www.google.com/url?q=http://archive.nepalitimes.com/news.php?id%3D2413%23.YOQRoi8RoWo&amp;source=gmail&amp;ust=1625725666191000&amp;usg=AFQjCNF86VG9E0i8u5OqfG5NvKJKILpBEA">Kosi High Dam</a>. The 300m high dam will create a reservoir submerging huge tracts of the Sun Kosi, Arun and Tamor Valleys in a kind of ‘trishul’. India needs the dam for flood control, and to facilitate inland navigation by storing monsoon water and discharging it in the dry season. But there are many questions regarding the proposed mega project.To begin with, the high silt load means that a future Kosi Reservoir would soon fill up with sediment. There are alternatives to dams: people in the Kosi plains have learnt to live with annual floods which deposit valuable soil nutrients, and diverting water through earlier river channels would ease flood impact.The village of Hanuman Nagar had to be relocated because of the barrage, and 60 years later some of its families and those further upstream have still not got compensated. The barrage also destroyed an important wetland, and <a href="https://www.nepalitimes.com/banner/the-great-trans-himalayan-bird-migration/" data-saferedirecturl="https://www.google.com/url?q=https://www.nepalitimes.com/banner/the-great-trans-himalayan-bird-migration/&amp;source=gmail&amp;ust=1625725666191000&amp;usg=AFQjCNFOCjdWAUhLv8LM1mLEnBNbFZeVHQ">migratory birds </a>now alight in <a href="http://archive.nepalitimes.com/news.php?id=15974#.YOQSqy8RoWo" data-saferedirecturl="https://www.google.com/url?q=http://archive.nepalitimes.com/news.php?id%3D15974%23.YOQSqy8RoWo&amp;source=gmail&amp;ust=1625725666191000&amp;usg=AFQjCNH9ndET9JXr1SU0_SRmfnAXaLeZ5A">Kosi Tappu Wildlife Reserve</a> instead.Extending the reserve further north and south could increase the habitat of endangered arna, wild elephants and freshwater dolphins, encourage ecotourism, and provide income to villagers whose grandparents had to move.The 60-year-old embankments that jacket the Kosi upstream and downstream from the Barrage have created the potential for a massive future disaster, an inland tsunami. Because of the river’s heavy silt content, the Kosi now flows on a deck 3-4m above the surrounding land. <a href="http://archive.nepalitimes.com/news.php?id=15163#.YOQR6y8RoWo" data-saferedirecturl="https://www.google.com/url?q=http://archive.nepalitimes.com/news.php?id%3D15163%23.YOQR6y8RoWo&amp;source=gmail&amp;ust=1625725666191000&amp;usg=AFQjCNELQRpfAALk_H4uMYlUohTJDiWrQg">In 2008, the Kosi breached the eastern embankment </a>at Kusaha, causing <a href="http://archive.nepalitimes.com/news.php?id=15193#.YOQTGy8RoWo" data-saferedirecturl="https://www.google.com/url?q=http://archive.nepalitimes.com/news.php?id%3D15193%23.YOQTGy8RoWo&amp;source=gmail&amp;ust=1625725666191000&amp;usg=AFQjCNGQbFvez-8I6Bv7_rYVwfQpczaNAg">destruction </a>downstream in Sunsari and Bihar. And that was when the river was not even in spate.<figure><img src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/2022111015118/636d06439c7e80680e0a5f52jpeg.jpg" alt="" width="1920" height="1080"><figcaption> </figcaption></figure>With extreme weather caused by climate change, or a confluence of cloud-bursts in the mountain catchment, <a href="http://archive.nepalitimes.com/news.php?id=3526#.YOQSOy8RoWo" data-saferedirecturl="https://www.google.com/url?q=http://archive.nepalitimes.com/news.php?id%3D3526%23.YOQSOy8RoWo&amp;source=gmail&amp;ust=1625725666191000&amp;usg=AFQjCNEvH8AZlBKUPb68a4OulBhpsm0Q2w">a record-breaking flood in future</a> could cause an engorged Kosi to bypass the barrage altogether and unleash a catastrophic flood downstream.The Kosi Barrage was meant to be a temporary solution, and the Kosi High Dam was always in the minds of the Indian authorities. There is a need for transparent and independent study by water experts, social scientists and technocrats to study the pros and cons of the Kosi High Dam.Siltation, seismicity, adaptation and mitigation, all need to be factored in with projected future climate impact. Meanwhile, across the world, ecologists are warning that the price to pay for large dams is too great because of the destruction of river ecosystems.A massive rockfill dam on a seismically active zone, the geopolitical implications as well as the social and environmental costs may outweigh the planned benefits. To make up for the mistake of the Kosi Barrage, we may be making an even greater blunder with the Kosi High Dam.

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The Kosi’s sorrow, and scope

<figure><img width="1400" height="933" src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221107171132/636933619c7e80680e03df95jpeg.jpg" alt=""/><figcaption>Photo: KUNDA DIXIT</figcaption></figure>Next week as Nepalis celebrate Tihar, the festival of lights, few will remember that it will mark the second anniversary of the end of paralysing power cuts.Sometimes lasting up to 18 hours a day, the <a href="https://www.nepalitimes.com/here-now/how-they-kept-nepal-in-the-dark-ages/" target="_blank" rel="noopener">load-shedding</a> increased the people’s hardship and crippled the economy. The man credited for ending power cuts, <a href="https://archive.nepalitimes.com/article/interview/interview-with-Kulman-Ghising,3409" target="_blank" rel="noopener">Kulman Ghising</a> of the Nepal Electricity Authority (NEA) said this week: “Light up your houses this Tihar, there is enough electricity.”The NEA estimates that demand next week will peak at 1,270 MW, but Ghising says there is enough supply from domestic generation and <a href="https://archive.nepalitimes.com/article/nation/nepal-india-thermal-power,3570" target="_blank" rel="noopener">Indian imports</a> to meet it. Read also:<a href="https://www.nepalitimes.com/editorial/climate-climax/" target="_blank" rel="noopener">Climate climax</a>, Editorial <a href="https://www.nepalitimes.com/banner/from-a-fossil-past-to-an-electric-future/" target="_blank" rel="noopener">From a fossil past to an electric future</a>, Om Astha Rai <img width="327" height="327" src="https://superdesk-pro-c.s3.amazonaws.com/sd-nepalitimes/20221107171132/636933649c7e80680e03df96jpeg.jpg" alt="">The reason for Ghising’s confidence is that 30MW has been added this year, his efforts to manage supply and cut leakage have increased capacity, and the Kulekhani reservoir is full. Even all this would not have ensured enough power – the real reason there will not be a dark Tihar is because of electricity imports from India.This year, Nepal’s electricity demand reached 1,281MW, but domestic generation never exceeded 525MW. The shortfall was made up by importing up to 505MW of electricity from coal-fired thermal plants in Bihar. Even with that, industries and some districts still suffered power cuts. The end to <a href="https://archive.nepalitimes.com/article/nation/corruption-in-electricity-industry-of-Nepal,3408" target="_blank" rel="noopener">load-shedding</a> has come at great environmental and economic cost. The average per capita carbon footprint of Nepalis is still low, but it has doubled because of fossil energy bought from India. The electricity import bill this year added Rs20 billion to the Rs150 billion Nepal was already spending to buy petroleum products from India.Read also:<a href="https://www.nepalitimes.com/opinion/decarbonise-now/" target="_blank" rel="noopener">Decarbonise now</a>, Ajaya Dixit<a href="https://www.nepalitimes.com/banner/electri-city-cars/" target="_blank" rel="noopener">Electri-City Cars</a>, Sikuma RaiThe government defends the power import, arguing that it is only a stop-gap measure and transmission lines built to import electricity from India can later be used to export Nepal’s surplus power to the Indian market.Former Minister of Water Resources Dipak Gyawali says that is not likely to happen because Nepal’s electricity demand is growing 100MW per year, and there is a lot of suppressed demand that not even big projects like Tama Kosi (440MW) can cover.Instead of building cross-border transmission lines, Gyawali urges the NEA to focus on connecting small hydro projects to the national grid to meet future domestic growth in consumption for cooking and transportation.Sadly, even while importing electricity generated from dirty coal from India, NEA cannot buy clean hydropower from private plants like the 6MW Khani Khola because they do not have transmission lines connecting them to the grid.Says one hydropower investor: “This is the irony of it all: we want to sell our electricity to NEA, but it is buying power from India.”

The cost of light

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Tama Kosi V

The Kosi’s sorrow, and scope

The cost of light