--- title: "Transmission expansion planning in deregulated market" subject: "Power Plant Design" chapter: 2 key: "semester_8/power_plant_design:transmission-planning-deregulated" source: https://www.bctengineer.com/q/semester_8/power_plant_design/transmission-planning-deregulated site: BCT Engineering --- # Transmission expansion planning in deregulated market Power Plant Design · Chapter 2: Integrated System Planning in Design Approach - Asked in: 2082 Shrawan, 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/transmission-planning-deregulated - Whole chapter: https://www.bctengineer.com/md/semester_8/power_plant_design/chapter-2 ## Question Discuss transmission expansion planning considering suitable inputs to it and its outcome focusing on deregulated electricity market of a nation. ## Short answer Transmission expansion planning decides where, when and what lines and substations to build using load forecasts, IPP generation scenarios, network data, reliability criteria and market congestion data. In deregulated markets the outcome is a least-cost plan that gives open access, reduces congestion, sets tariffs, and evacuates private and cross-border power reliably. ## Answer **Transmission expansion planning (TEP)** decides where, when and what new transmission lines and substations should be built so that power from generators reaches loads reliably and economically over the planning period. In a **deregulated market**, generation is built by many private companies, so the transmission planner (system operator/transmission company) must plan under uncertainty and ensure open access. #### Inputs - Load forecast by region/substation (peak MW, energy). - Generation expansion scenarios: location and timing of IPP plants, cross-border import/export. - Existing network data: lines, transformers, ratings, impedances. - Reliability and planning criteria: N-1 security, voltage limits (e.g. ±5%), thermal limits, fault levels. - Cost data: line cost per km, substation cost, losses, right-of-way. - Market data: bids, congestion history, locational prices, wheeling charges, regulatory rules. #### Process Load-flow, contingency and short-circuit studies on candidate networks; comparison of alternatives by cost, losses and congestion relief; stakeholder consultation; regulator approval. #### Outcome - Least-cost set of new lines/substations with voltage level, route and commissioning year. - Reduced **congestion**, so market prices are uniform and competition is fair. - **Open, non-discriminatory access** for all generators and traders. - Transmission tariff and cost allocation among users. - Reliable evacuation of IPP power and cross-border trade (e.g. Nepal's 400 kV backbone and Nepal–India links). ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. Transmission expansion planning decides A. only generator fuel prices B. where, when and what new lines and substations should be built C. only tariffs D. only distribution feeders Answer: B. TEP chooses location, timing and type of lines and substations to move power reliably and economically. (Key point: What TEP decides) 2. Which input is specific to deregulated markets? A. Conductor weight B. Soil type C. Colour of towers D. Market data such as bids, congestion history, locational prices and wheeling charges Answer: D. Market data and generation scenarios of private IPPs are key inputs besides the usual network data. (Key point: Deregulated inputs) 3. Why must the planner work under uncertainty in a deregulated market? A. Generation is built by many private companies whose location and timing are not controlled B. Load never changes C. Lines are free D. There is only one generator Answer: A. IPPs decide for themselves, so the planner cannot know exactly where generation will appear. (Key point: Why uncertainty) 4. Which is an outcome of TEP in a market? A. Higher congestion B. Closed access for few generators C. Reduced congestion and open non-discriminatory access with tariff and cost allocation D. Removal of N-1 security Answer: C. Outcomes include least-cost lines, less congestion, open access, and cost allocation among users. (Key point: Outcome) ## Related in Power Plant Design - [Transmission expansion planning and applicability](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Atransmission-expansion-applicability) — Power Plant Design, chapter 2 - [Transmission expansion planning procedure](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Atransmission-expansion-procedure) — Power Plant Design, chapter 2 - [Transmission and distribution planning procedure](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Aplanning-transmission-distribution) — Power Plant Design, chapter 2 - [Generation expansion planning procedure](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Ageneration-expansion-procedure) — Power Plant Design, chapter 2, asked 3× - [Power system expansion planning for a utility](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Aexpansion-planning-national-utility) — Power Plant Design, chapter 2 - [Generation expansion planning and load forecasting](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Ageneration-expansion-load-forecast) — Power Plant Design, chapter 2 ## Related in other subjects - [Power market, hydrology and geology in planning](https://www.bctengineer.com/question.md?key=semester_6%2Fhydro_power%3Apower-market-hydrology-geology) — Hydro Power, chapter 3 - [Interconnected system and transmission planning](https://www.bctengineer.com/question.md?key=semester_8%2Ftransmission_and_distribution_system_design%3Ainterconnected-system-planning) — Transmission and Distribution System Design, chapter 1 - [Case study: Nepal Electricity Authority / Telecom](https://www.bctengineer.com/question.md?key=semester_7%2Forganization_and_management%3Acase-study-nea-nt) — Organization and Management, chapter 9 - [MRP concept, inputs and outputs](https://www.bctengineer.com/question.md?key=semester_6%2Findustrial_engineering_and_management%3Amrp-concept-inputs-and-outputs) — Industrial Engineering and Management, chapter 5