Nepal's 100% Hydropower Bet Faces Climate Reckoning After Floods Knock Out 12 Plants

For climate and energy planners, Nepal is a live case study of what happens when a country builds its entire grid around a resource that climate change is making less predictable. The 2 September 2026 floods did not just destroy villages—they knocked out 12 hydropower plants in a single basin and removed more than 10% of national generation capacity. The lesson is urgent: climate adaptation must be embedded in energy infrastructure planning before the next extreme event.

The catastrophic floods that struck Nepal on 2 September 2026 exposed the fragility of one of the world's most hydropower-dependent electricity systems. More than 1,300 people were killed and thousands remain missing after floods and landslides devastated villages near the Nepal-Tibet border. The same event severely damaged 12 hydropower plants in the Trishuli River basin, according to the BBC, knocking out more than 10% of Nepal's total power generation capacity in a single blow. The state-owned Nepal Electricity Authority, which owns six of the 12 damaged facilities, says it does not yet know whether any can be brought back into operation. The damage is especially significant because almost 100% of Nepal's electricity comes from hydropower, and the country has recently transformed itself from a chronic power-shortage state into a regional electricity exporter earning nearly $200m a year from sales to India and Bangladesh.

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The same event severely damaged 12 hydropower plants in the Trishuli River basin, according to the BBC, knocking out more than 10% of Nepal's total power generation capacity in a single blow.

Nepal's electrification story is remarkable in its speed. In 2010 only two-thirds of Nepalis had access to electricity, and even connected households faced power cuts of up to 16 hours a day. A combination of hydropower expansion, anti-corruption efforts and increased power imports from India meant that by 2018 most of the country was enjoying 24-hour power supply. Today Nepal has 225 hydropower plants with more than 3,900 MW of installed capacity, enough to power roughly three million households simultaneously, and hundreds more projects are under construction or planned. Most of these facilities are run-of-river plants built high in the mountains to capture fast-flowing water, with little or no storage. That design has enabled rapid expansion and low-cost generation, but it leaves the grid acutely exposed to floods, landslides and glacial lake outbursts.

The floods are not an isolated operational accident. They are a climate signal. The high-altitude regions of the Himalayas are warming about 50% faster than the global average, destabilizing glaciers and increasing the risk of glacial lake outburst floods and sediment-laden flows. Run-of-river hydropower plants are particularly vulnerable because they have no reservoir buffer to absorb a sudden surge of water, debris or sediment. When multiple plants in the same basin are damaged at once—as happened in the Trishuli River basin—the system loses not just one facility but a large share of national capacity simultaneously. This is a systemic risk, not a series of independent failures.