--- title: "Potentials and challenges of hydropower" subject: "Energy Environment and Society" chapter: 3 key: "semester_7/energy_environment_and_society:hydropower-potential-challenges" source: https://www.bctengineer.com/q/semester_7/energy_environment_and_society/hydropower-potential-challenges site: BCT Engineering --- # Potentials and challenges of hydropower Energy Environment and Society · Chapter 3: Renewable Energy Sources - Asked in: 2072 Chaitra - Video: [Hydropower - The Sleeping Giant of Clean Energy](https://www.youtube.com/watch?v=hck5urV5DWM) — EARTH 2050 - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_7/energy_environment_and_society/hydropower-potential-challenges - Whole chapter: https://www.bctengineer.com/md/semester_7/energy_environment_and_society/chapter-3 ## Question Write down the potentials and challenges of the hydropower based energy system. ## Short answer Nepal has 83,000 MW theoretical and 42,000 MW economically feasible hydropower; installed capacity exceeds 3,000 MW. Challenges include high capital cost, difficult geology, seasonal flow variations, sedimentation, environmental impacts, weak transmission, and policy delays. ## Answer #### Potential - **Nepal:** about 83,000 MW theoretical potential and about 42,000 MW economically feasible, thanks to steep rivers (Koshi, Gandaki, Karnali, Mahakali) with Himalayan snow and monsoon rainfall. Installed capacity is above 3,000 MW and is growing (about 3,500 MW or more by 2025), with the Upper Tamakoshi (456 MW) and Kaligandaki A (144 MW) among the large projects. - Clean, renewable, low operating cost, long life (50+ years), and storable (reservoirs) for peaking. - Export potential to India and Bangladesh, and basis for industry and electric cooking and transport. - Multi-purpose benefits: irrigation, flood control, water supply, tourism. #### Challenges 1. **High capital cost** and long construction time; financing difficulties. 2. **Difficult geology and terrain:** landslides, floods, glacial lake outburst floods (GLOF) and earthquakes (2015 Gorkha earthquake damaged plants). 3. **Seasonal variation:** high monsoon flow and low dry-season flow, so wet-season surplus and winter shortage; shortage of storage projects. 4. **Environmental and social impacts:** displacement, loss of land and forest, sediment, effect on aquatic life. 5. **Transmission and distribution:** weak transmission lines, delays in grid connection, and losses. 6. **Policy and governance:** delay in licences, land acquisition, PPAs, political issues, and regional trade agreements. 7. **Climate change:** changing glaciers and rainfall patterns. 8. **Sediment erosion** of turbines. Solutions: storage and pumped-storage projects, sound planning with EIA, early community involvement and benefit sharing, and regional power trade. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. Which figures describe Nepal's hydropower potential in the answer? A. About 83,000 MW theoretical and about 42,000 MW economically feasible B. About 3,000 MW theoretical and 83,000 MW feasible C. About 42,000 MW theoretical and 83,000 MW feasible D. About 456 MW theoretical and 144 MW feasible Answer: A. Theoretical potential is about 83,000 MW, of which about 42,000 MW is economically feasible. (Key point: Nepal's hydropower potential) 2. Why does seasonal variation challenge Nepal's run-of-river hydropower? A. Monsoon flow is low and winter flow is high B. Flow is the same all year but demand varies C. Wet-season surplus and dry-season shortage occur because of few storage projects D. Snow melt stops all generation in summer Answer: C. Flow is high in monsoon and low in the dry season, so storage is needed to avoid winter shortage. (Key point: Seasonal variation) 3. Which is listed as a solution to hydropower challenges? A. Banning exports B. Avoiding EIA to save time C. Using only small run-of-river plants without storage D. Storage and pumped-storage projects, community benefit sharing and regional power trade Answer: D. Storage and pumped storage handle seasonality, and benefit sharing and trade address social and market issues. (Key point: Solutions to challenges) ## Related in Energy Environment and Society - [Energy storage technologies and challenges](https://www.bctengineer.com/question.md?key=semester_7%2Fenergy_environment_and_society%3Aenergy-storage-technologies-challenge) — Energy Environment and Society, chapter 5, asked 3× - [Advantages and challenges of solar PV](https://www.bctengineer.com/question.md?key=semester_7%2Fenergy_environment_and_society%3Apv-advantages-disadvantages) — Energy Environment and Society, chapter 3 - [Hydropower requirements and components](https://www.bctengineer.com/question.md?key=semester_7%2Fenergy_environment_and_society%3Ahydropower-requirements-components) — Energy Environment and Society, chapter 3 - [Short note: Pumped storage hydropower](https://www.bctengineer.com/question.md?key=semester_7%2Fenergy_environment_and_society%3Apumped-storage-hydropower) — Energy Environment and Society, chapter 5 - [Hydropower source and plant types](https://www.bctengineer.com/question.md?key=semester_7%2Fenergy_environment_and_society%3Ahydropower-plant-classification) — Energy Environment and Society, chapter 3 - [Hydropower site power and turbine](https://www.bctengineer.com/question.md?key=semester_7%2Fenergy_environment_and_society%3Ahydro-site-power-numerical) — Energy Environment and Society, chapter 3 ## Related in other subjects - [Challenges of modeling a physical system](https://www.bctengineer.com/question.md?key=semester_6%2Fembedded_system%3Amodeling-physical-system-challenges) — Embedded System, chapter 7 - [Microprocessor based system and bus organization](https://www.bctengineer.com/question.md?key=semester_4%2Fmicroprocessor%3Amp-based-system-bus-organization) — Microprocessor, chapter 1, asked 5× - [Step and touch potentials, shock and safety](https://www.bctengineer.com/question.md?key=semester_8%2Fhigh_voltage_engineering%3Astep-touch-potential-safety) — High Voltage Engineering, chapter 2 - [Opportunities, challenges and HDP comments](https://www.bctengineer.com/question.md?key=semester_7%2Fhydropower_engineering%3Aopportunities-challenges-hdp) — Hydropower Engineering, chapter 1, asked 2×