--- title: "Tie-up between two national utilities" subject: "Power Plant Design" chapter: 2 key: "semester_8/power_plant_design:national-utilities-tie-up" source: https://www.bctengineer.com/q/semester_8/power_plant_design/national-utilities-tie-up site: BCT Engineering --- # Tie-up between two national utilities Power Plant Design · Chapter 2: Integrated System Planning in Design Approach - Asked in: 2073 Magh, 4 marks - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_8/power_plant_design/national-utilities-tie-up - Whole chapter: https://www.bctengineer.com/md/semester_8/power_plant_design/chapter-2 ## Question Discuss the scenario of tie up between two national level electric utilities. ## Short answer A tie-up between national utilities is an agreement and cross-border interconnection for power exchange and reserve sharing. Nepal-India example: 400 kV Dhalkebar-Muzaffarpur line, Power Trade Agreement, export via IEX, long-term target 10,000 MW. Benefits include wet-season export, dry-season import, shared reserve, market for hydro; issues include approvals, pricing, transmission capacity. ## Answer A **tie-up between two national utilities** is an agreement and physical interconnection (cross-border transmission lines) that allows two countries' electricity utilities to exchange power, share reserve and trade energy. The **Nepal (NEA) – India** tie-up is the main example for Nepal. #### Present scenario (Nepal–India) - Many 11, 33 and 132 kV cross-border links exist, plus the **Dhalkebar–Muzaffarpur 400 kV** line (first charged at 220 kV, operated at 400 kV since 2020). - New 400 kV links (Butwal–Gorakhpur, Dhalkebar–Sitamarhi, Inaruwa–Purnea) are under construction or planned. - The Power Exchange Agreement (since 1971) and the Power Trade Agreement (2014) allow trade; Nepal has sold power through the Indian Energy Exchange since 2021. - A long-term agreement (2024) targets 10,000 MW of export to India within ten years; tripartite trade to Bangladesh (40 MW) started in 2024. #### Benefits - Nepal sells its wet-season surplus and imports in the dry season. - Shared reserve and better reliability for both. - India gets clean hydropower for its renewable targets. - Investment in Nepal's large hydro becomes viable with an assured market. #### Issues Approval needed from Indian authorities for each project, pricing, transmission capacity, grid code compatibility and political dependence. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. A tie-up between two national utilities is A. a merger of companies B. an agreement and physical cross-border interconnection for exchanging power, sharing reserve and trading energy C. only a tariff D. a fuel purchase Answer: B. It allows power exchange, shared reserve and energy trade. (Key point: What a tie-up is) 2. Which line is the main 400 kV Nepal-India link mentioned? A. Dhalkebar-Muzaffarpur B. Kathmandu-Pokhara C. Butwal-Kathmandu D. Hetauda-Bharatpur Answer: A. Dhalkebar-Muzaffarpur, operated at 220 kV and being upgraded to 400 kV. (Key point: Nepal-India link) 3. Which is a benefit for Nepal? A. Sells wet-season surplus and imports in dry season B. Loses all hydropower C. No reserve sharing D. Stops investment Answer: A. Assured market also makes large hydro investments viable. (Key point: Benefit to Nepal) 4. Which is an issue of tie-up? A. Too many free lines B. Approval from Indian authorities for projects, pricing, transmission capacity, grid code compatibility C. No demand D. Excess reserve Answer: B. Approvals, pricing, capacity, grid codes and politics are the challenges. 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