--- title: "Energy sources in Nepal and wind scope" subject: "Power Plant Design" chapter: 1 key: "semester_8/power_plant_design:energy-sources-nepal-wind" source: https://www.bctengineer.com/q/semester_8/power_plant_design/energy-sources-nepal-wind site: BCT Engineering --- # Energy sources in Nepal and wind scope Power Plant Design · Chapter 1: Energy Sources and Electric Power Generation - Asked in: 2079 Jestha, 8 marks; 2077 Chaitra, 6 marks (asked 2 times) - Video: [How Wind Turbine Work | Wind Energy to Electric Energy | Parts of Wind Turbine | Khan Sir Patna](https://www.youtube.com/watch?v=vfxX4HMBj6o) — Khan GS Research Centre - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_8/power_plant_design/energy-sources-nepal-wind - Whole chapter: https://www.bctengineer.com/md/semester_8/power_plant_design/chapter-1 ## Question What are the conventional and non-conventional energy sources in Nepal? Describe the technology, possibility and scope of wind energy in the context of Nepal. ## Short answer Conventional sources: traditional biomass, large hydro, imported petroleum, coal. Non-conventional: solar, wind, micro hydro, biogas. Wind technology uses rotor, gearbox, generator; power scales with cube of wind speed (cut-in ~3–4 m/s). Potential ~3000 MW in Kagbeni, Kali Gandaki; best as wind-solar hybrid mini-grids complementing dry-season hydro. ## Answer Energy sources are grouped by how long they have been widely used and whether they are renewable. #### Conventional and non-conventional sources in Nepal | Conventional | Non-conventional (alternative) | |---|---| | Traditional biomass (firewood, dung, crop residue) | Solar (PV, solar water heater, solar dryer) | | Large and medium hydropower | Wind energy | | Imported petroleum (diesel, petrol, kerosene, LPG) | Micro/pico hydro, improved water mills | | Coal (imported, used in industry) | Biogas, briquettes, gasifiers | | | Geothermal (hot springs), green hydrogen | Traditional biomass is still the largest share of total energy use; imported petroleum is the second; hydropower supplies almost all grid electricity. #### Technology of wind energy Wind power converts kinetic energy of moving air into electricity. ```text Wind -> Blades -> Hub -> Gearbox -> Generator | Converter/Transformer | Grid / battery (tower, yaw drive, pitch control, controller) ``` - **Rotor**: 2 or 3 blades (HAWT) or vertical-axis (Darrieus, Savonius). - **Gearbox**: steps up low rotor speed to generator speed (not used in direct-drive types). - **Generator**: induction generator, DFIG, or permanent magnet synchronous generator. - **Controls**: pitch control, yaw control, brake, and power electronics for grid connection. - Power: $P = \frac{1}{2}\rho A v^3 C_p$, with $C_p$ limited to 0.593 (Betz limit); practical 0.35–0.45. - Cut-in speed about 3–4 m/s, rated about 12–15 m/s, cut-out about 25 m/s. #### Possibility and scope in Nepal - The SWERA study (Solar and Wind Energy Resource Assessment, AEPC, 2008) estimated a wind potential of about **3,000 MW** in areas with good wind power density. - Promising sites: Kagbeni and the Kali Gandaki valley (Mustang), Khumbu, Palpa and some mountain passes, where valley winds are strong in the afternoon. - Early projects: a 20 kW turbine at Kagbeni (1989) failed soon due to poor maintenance; later small wind–solar hybrid systems (e.g. Dhaubadi, Nawalparasi) were installed by AEPC. **Scope (opportunities):** 1. Electrify remote mountain villages as wind–solar–battery hybrid mini-grids. 2. Wind is often strong in the dry winter season when hydropower output is low, so it complements run-of-river hydro. 3. Telecom towers, trekking lodges and tourism areas. **Limitations:** 1. Detailed long-term wind data is scarce; winds are site-specific and turbulent in valleys. 2. Transport of large blades and towers on mountain roads is difficult. 3. High cost per kW, lack of skilled maintenance, and strong competition from cheap hydropower. Wind therefore has good scope as small and medium hybrid systems in specific windy valleys rather than large wind farms. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. What limits the power coefficient Cp of a wind turbine? A. Betz limit of 0.593 B. Gearbox ratio of 3 C. Cut-out speed D. Tower height Answer: A. Cp cannot exceed 0.593; practical values are 0.35-0.45. (Key point: Wind power formula and Betz) 2. Which is a non-conventional source in Nepal? A. Imported petroleum B. Traditional firewood C. Large hydropower D. Wind energy Answer: D. Solar, wind, micro hydro, biogas and geothermal are non-conventional; firewood, large hydro and petroleum are conventional. (Key point: Conventional vs non-conventional) 3. Why does wind complement hydropower in Nepal? A. Wind is strongest in the wet monsoon B. Wind is often strong in the dry winter when hydro output is low C. Wind needs no site study D. Wind is cheaper than hydro everywhere Answer: B. Winter wind in windy valleys fills the gap when run-of-river hydro is low. (Key point: Scope of wind in Nepal) 4. Which is a limitation of wind in Nepal? A. Too much long-term data B. Easy transport of blades on mountain roads C. Scarce wind data, difficult transport and high cost per kW D. No competition from hydropower Answer: C. Data is scarce, transport is hard, cost per kW is high and cheap hydro competes. (Key point: Limitations) ## Related in Power Plant Design - [Replacing fossil fuel with non-conventional energy](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Aenergy-sources-replace-fossil) — Power Plant Design, chapter 1 - [Conventional, non-conventional sources and biomass](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Aenergy-sources-biomass) — Power Plant Design, chapter 1 - [Energy sources and solar power generation](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Aenergy-sources-solar-power) — Power Plant Design, chapter 1 - [SWOT analysis of wind power in Nepal](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Awind-swot-nepal) — Power Plant Design, chapter 1 - [Wind energy conversion options and characteristics](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Awind-conversion-options) — Power Plant Design, chapter 1 - [Geothermal energy uses and plant types in Nepal](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Ageothermal-use-nepal) — Power Plant Design, chapter 1 ## Related in other subjects - [Wind energy, factors and scope](https://www.bctengineer.com/question.md?key=semester_7%2Fenergy_environment_and_society%3Awind-energy-factors-scope) — Energy Environment and Society, chapter 3 - [Conventional and non-conventional sources](https://www.bctengineer.com/question.md?key=semester_7%2Fenergy_environment_and_society%3Aconventional-nonconventional-sources) — Energy Environment and Society, chapter 2 - [Conventional vs non-conventional sources with schematic](https://www.bctengineer.com/question.md?key=semester_4%2Fpower_system_analysis_i%3Aconventional-vs-nonconventional-sources-schematic) — Power System Analysis I, chapter 1 - [Conventional sources and features of a station](https://www.bctengineer.com/question.md?key=semester_4%2Fpower_system_analysis_i%3Aconventional-sources-features) — Power System Analysis I, chapter 1