--- title: "Benefits of electrical energy; utilization in Nepal" subject: "Utilization of Electrical Energy" chapter: 1 key: "semester_7/utilization_of_electrical_energy:benefits-electrical-energy-nepal-utilization" source: https://www.bctengineer.com/q/semester_7/utilization_of_electrical_energy/benefits-electrical-energy-nepal-utilization site: BCT Engineering --- # Benefits of electrical energy; utilization in Nepal Utilization of Electrical Energy · Chapter 1: Introduction - Asked in: 2081 Baisakh, 8 marks - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_7/utilization_of_electrical_energy/benefits-electrical-energy-nepal-utilization - Whole chapter: https://www.bctengineer.com/md/semester_7/utilization_of_electrical_energy/chapter-1 ## Question What are the benefits of electrical energy in comparison with other sources of energy? Describe the Electrical power utilization of Nepal with respect to various consumer and voltage level. ## Short answer Electrical energy offers easy long-distance transmission, clean and efficient conversion to heat, light, and motion, and uses indigenous hydropower, reducing fuel imports. In Nepal, domestic consumers use 230/400 V with an evening peak, industries use 400 V to 132 kV with high load factor, and other classes include commercial, agricultural, and public services; the system exploits diversity and promotes electric cooking and EVs. ## Answer #### Benefits of electrical energy over other sources 1. **Easy and cheap transmission**: transmitted over long distances by lines; no transport of fuel by truck or pipeline. 2. **Easy conversion**: readily converted to mechanical (motors), heat (heaters, furnaces), light (lamps), chemical (electrolysis, battery charging) and sound energy. 3. **Easy control**: switching on/off, speed control of motors, temperature control of heaters are simple, accurate and can be automated or remote. 4. **High efficiency** at the point of use: electric motors 85 to 97 %, induction heating far better than open flame. 5. **Clean**: no smoke, ash or fumes at the point of use; silent operation. 6. **No storage of fuel** needed at the consumer; available instantly at the switch. 7. **Flexible**: from mW (electronics) to hundreds of MW (smelters) with the same supply. 8. **Safe and reliable** when properly protected; renewable generation (hydro, solar) makes it sustainable. 9. **Economical** in Nepal: hydropower is an indigenous resource, while petroleum and LPG are fully imported. Limitation: cannot be stored cheaply in bulk; generation must match demand instantly. #### Electrical power utilization in Nepal by consumer and voltage level The Nepal Electricity Authority (NEA) supplies consumers in tariff categories according to use and supply voltage. ```text Generation (hydro) 11 kV | step-up Transmission 400 / 220 / 132 kV | Sub-transmission 66 / 33 kV ---> large industries | Primary distribution 11 kV ---> medium industries, | large commercial Secondary 400/230 V ---------> domestic, small industry, commercial, street light, irrigation ``` | Consumer category | Typical voltage level | Main uses | |---|---|---| | Domestic | 230 V single-phase; 400 V three-phase | Lighting, cooking, appliances | | Small industry | 400 V | Mills, workshops, small factories | | Medium industry | 11 kV | Food processing, textiles, plastics | | Large industry | 33 kV / 66 kV / 132 kV | Cement, steel, paper | | Commercial | 400 V / 11 kV | Hotels, offices, hospitals, malls | | Non-commercial | 400 V / 11 kV | Government offices, schools | | Irrigation | 400 V / 11 kV | Pumping | | Water supply | 400 V / 11 kV | Drinking water pumping | | Street light | 230/400 V | Public lighting | | Transport / EV charging | 400 V / 11 kV | EV charging stations, trolley bus | | Temple, community | 230/400 V | Religious, community use | **Pattern of use.** Domestic and industrial consumers together account for most energy sold (roughly comparable shares, each around 40 %), with commercial and others making up the rest (as per NEA annual reports; shares change each year). Domestic load causes a sharp evening peak, while industry gives a steadier base load. Per-capita consumption is still low compared with the world average, so the government promotes electric cooking, EVs and industrial load to use the growing hydropower surplus, especially in the wet season, alongside power export to India. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. Which benefit means electricity can be turned into motion, heat, light and chemical energy? A. Easy control B. Easy conversion C. No fuel storage D. Cheap bulk storage Answer: B. Electricity is readily converted to mechanical, heat, light, chemical and sound energy. (Key point: Easy conversion) 2. What is the main limitation of electrical energy stated? A. It cannot be transmitted B. It produces smoke C. It cannot be stored cheaply in bulk, so generation must match demand instantly D. It cannot be controlled Answer: C. Bulk storage is costly, so supply must follow demand continuously. (Key point: Limitation) 3. At which voltage are large industries (cement, steel, paper) supplied in Nepal? A. 230 V B. 400 V C. 11 kV D. 33, 66 or 132 kV Answer: D. Large industries take supply at 33/66/132 kV; medium at 11 kV; small at 400 V. (Key point: Voltage level of large industry) 4. What do domestic and industrial loads respectively contribute to the Nepal load curve? A. Domestic gives steady base load, industry gives evening peak B. Both give only night load C. Domestic gives a sharp evening peak, industry gives a steadier base load D. Neither affects the load curve Answer: C. Domestic use peaks sharply in the evening while industry gives a steadier base. 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