---
title: "Sustainability of rural micro-hydro"
subject: "Energy Environment and Society"
chapter: 3
key: "semester_7/energy_environment_and_society:micro-hydro-sustainable"
source: https://www.bctengineer.com/q/semester_7/energy_environment_and_society/micro-hydro-sustainable
site: BCT Engineering
---

# Sustainability of rural micro-hydro

Energy Environment and Society · Chapter 3: Renewable Energy Sources

- Asked in: 2074 Asoj, 4 marks
- 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/micro-hydro-sustainable
- Whole chapter: https://www.bctengineer.com/md/semester_7/energy_environment_and_society/chapter-3

## Question

How can we say a micro-hydro project in a rural area is sustainable?

## Short answer

A micro-hydro project is sustainable if it reliably serves the community for its full life without outside support while protecting people and environment. Key dimensions are technical (year-round water, trained local technicians, spare parts), financial (tariff covers O&M and depreciation, productive uses), social (community ownership, transparent users committee), environmental (minimum flow, watershed protection), and policy support.

## Answer

A rural micro-hydro (MH) project (up to 100 kW) is **sustainable** when it keeps providing reliable, affordable service for its whole life without outside support, and without harming people or the environment. We can judge it by the following dimensions.

1. **Technical sustainability**
   - A reliable water source throughout the year (checked with flow measurements), proper design and good-quality equipment.
   - Local technicians trained for operation and repair; spare parts available (Nepal has local turbine manufacturers).
   - Protection of the intake and canal from floods and landslides.
2. **Financial / economic sustainability**
   - Income from tariffs (and productive uses) covers operation and maintenance, salaries, repairs, and a depreciation fund.
   - Productive end uses (agro-mills, workshops, cold storage, lodges) increase load and income during the daytime.
   - The AEPC subsidy lowers the upfront cost, and any bank loan can be repaid without putting stress on poor households.
3. **Social / institutional sustainability**
   - A community-owned and managed organisation (a Users' Committee/cooperative) with clear rules, transparent accounts, and gender and caste inclusion.
   - Local ownership and participation from planning to operation.
4. **Environmental sustainability**
   - Small water use leaving enough flow for the river (minimum flow), little land disturbance, and replacing firewood and kerosene reduces emissions and deforestation.
   - Watershed protection by the community.
5. **Policy support:** subsidy, technical support from AEPC, grid interconnection policy so that surplus power can be sold to NEA.

If all these conditions are met, the project can run for 20+ years and help local development; if not, it ends up broken, as many early schemes did.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. When is a rural micro-hydro project called sustainable?
   A. When it was built with a large subsidy
   B. When it provides reliable, affordable service for its whole life without outside support and without harming people or environment
   C. When it has the highest installed capacity
   D. When it is owned by a private company
   Answer: B. Sustainability means long-term reliable, affordable service that is locally supported and harmless. (Key point: Definition of sustainability)

2. Which supports financial sustainability of a micro-hydro scheme?
   A. Tariff income covering O&M and a depreciation fund, plus productive end uses raising daytime load
   B. Running only for evening lighting
   C. Relying on donations for repairs
   D. Charging no tariff
   Answer: A. Revenue must cover operation, repairs and replacement, and productive uses like agro-mills increase load and income. (Key point: Financial sustainability)

3. What gives social/institutional sustainability?
   A. Management by an outside contractor
   B. A community-owned Users' Committee with clear rules, transparent accounts and inclusion
   C. Keeping accounts private to the operator
   D. Ownership by the government only
   Answer: B. Local ownership and participation with transparent management keep the scheme running. (Key point: Social sustainability)

4. Which feature makes a micro-hydro scheme environmentally sustainable?
   A. Diverting the whole river flow
   B. Large reservoir and land clearing
   C. Leaving minimum flow in the river and protecting the watershed
   D. Using diesel as backup
   Answer: C. Small water use with minimum flow and watershed protection, plus replacing firewood and kerosene, keeps it sustainable. (Key point: Environmental sustainability)

## Related in other subjects

- [Monthly progress report on micro-hydro project](https://www.bctengineer.com/question.md?key=semester_5%2Fcommunication_english%3Amonthly-progress-report-micro-hydro) — Communication English, chapter 7, asked 3×
- [Report on micro hydro project (abstract to findings)](https://www.bctengineer.com/question.md?key=semester_5%2Fcommunication_english%3Areport-micro-hydro-project-manager) — Communication English, chapter 8
- [Third monthly progress report: micro-hydro, Dhading (memo)](https://www.bctengineer.com/question.md?key=semester_5%2Fcommunication_english%3Athird-monthly-progress-report-dhading-memo) — Communication English, chapter 7
- [AC voltage controller in ELC for micro-hydro](https://www.bctengineer.com/question.md?key=semester_7%2Fpower_electronics%3Aacvc-elc-micro-hydro) — Power Electronics, chapter 6, asked 6×