South Asia, characterized by rapid economic growth and increasing energy demands, is turning to hydropower as a cornerstone of its renewable energy strategy. Hydropower offers low-carbon electricity, grid stability, water regulation, and rural electrification, with countries like Bhutan, Nepal, and India relying heavily on it for domestic needs and regional energy trade. However, the hydropower sector faces significant challenges due to climate change, which is altering hydrological regimes and threatening infrastructure reliability. Rising temperatures, glacial retreat, and erratic monsoons have disrupted water flow patterns, complicating predictions of water availability and stressing existing infrastructure. Additionally, hydropower development in the region is shaped by complex socio-political dynamics, including transboundary water governance, geopolitical tensions, and environmental justice concerns. Large-scale dam projects often result in ecological degradation and social displacement, disproportionately affecting vulnerable communities. Despite these challenges, recent technological advancements in turbine design, reservoir modeling, and energy storage offer potential solutions to enhance hydropower resilience and sustainability. Furthermore, integrating hydropower with complementary renewables like solar and wind could address climate vulnerabilities and provide load balancing. This study explores the evolving role of hydropower in South Asia, focusing on climate resilience, energy security, and social equity. It synthesizes technological, environmental, and political perspectives to offer insights into how hydropower can be sustainably developed amid climatic and socio-economic transformations. The study emphasizes the need for adaptive policy frameworks, cross-border cooperation, and inclusive governance to ensure that hydropower development aligns with sustainable development goals and environmental justice principles. Ultimately, the future of hydropower in South Asia hinges on a comprehensive approach that integrates infrastructure, governance, and climate resilience.
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