--- title: "Define load forecast" subject: "Power Plant Design" chapter: 2 key: "semester_8/power_plant_design:define-load-forecast" source: https://www.bctengineer.com/q/semester_8/power_plant_design/define-load-forecast site: BCT Engineering --- # Define load forecast Power Plant Design · Chapter 2: Integrated System Planning in Design Approach - Asked in: 2070 Bhadra, 4 marks - Video: [Forecasting in Electric Power Systems](https://www.youtube.com/watch?v=Y9y8MceDeQ0) — Rosemary Alden - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_8/power_plant_design/define-load-forecast - Whole chapter: https://www.bctengineer.com/md/semester_8/power_plant_design/chapter-2 ## Question Define load forecast (on the basis of integrated system planning approach). ## Short answer Load forecast estimates future peak power and energy demand for a period and area, classified by horizon from very short-term to long-term. It considers population, economy, past trends, price, weather and policy, using methods like trend, econometric, end-use, time series. It is the first input for integrated system planning. ## Answer **Load forecast** is the estimate of the future electrical demand of a system, in terms of peak power (MW) and energy (MWh/GWh), for a given time period and area. It is the first and most basic input of integrated system planning. #### Types by time horizon | Type | Horizon | Use | |---|---|---| | Very short-term | Minutes–1 hour | Real-time control, AGC | | Short-term | 1 hour–1 week | Unit commitment, dispatch, reserve | | Medium-term | 1 month–1 year | Maintenance, fuel, hydro scheduling | | Long-term | 1–25 years | Generation, transmission, distribution expansion | #### Factors considered Population and economic growth, past consumption trend, electricity price, weather, new connections (industries, EVs, cooking), and government policy. #### Methods Trend extrapolation, econometric (regression), end-use method, time series, and intelligent methods (ANN, fuzzy logic). #### Role in integrated planning It decides how much generation, transmission and distribution capacity is needed and when. Forecasts are made in high, base and low scenarios to handle load uncertainty. Example: NEA's load forecast is used to decide the timing of new hydro projects and 400 kV lines. ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. Load forecast is: A. The measurement of present loading of the lines B. The estimate of future demand in MW and MWh for a given period and area C. The schedule of generator maintenance D. The tariff for each consumer class Answer: B. A load forecast estimates future peak power and energy, and is the first input of integrated planning. (Key point: Definition) 2. Which forecast type is used for generation, transmission and distribution expansion? A. Very short-term (minutes to 1 hour) B. Short-term (1 hour to 1 week) C. Medium-term (1 month to 1 year) D. Long-term (1 to 25 years) Answer: D. Long-term forecasts guide capacity expansion; short-term ones serve unit commitment and dispatch. (Key point: Time horizons) 3. Why are forecasts made in high, base and low scenarios? A. To handle load uncertainty in planning B. To avoid using econometric methods C. To fix the tariff D. To reduce the peak demand Answer: A. Scenarios cover the uncertainty in growth, so the plan stays robust. (Key point: Scenarios) 4. In integrated system planning, the load forecast mainly decides: A. The colour coding of lines B. How much generation, transmission and distribution capacity is needed and when C. Only the voltage level of the grid D. Only the fuel price Answer: B. The forecast sets the size and timing of the new plants and lines. (Key point: Role in planning) ## Close variants set in other exams - [Define load uncertainties](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Adefine-load-uncertainties) — Power Plant Design, chapter 2, asked 3× ## Related in Power Plant Design - [Parameters for planning and sizing a plant](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Aplant-sizing-parameters) — 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 - [Power system planning and grid integration](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Aplanning-deregulated-grid-integration) — Power Plant Design, chapter 2 - [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 - [Factors affecting system expansion planning](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Asystem-expansion-factors) — Power Plant Design, chapter 2 - [Accurate load forecasting and system security](https://www.bctengineer.com/question.md?key=semester_8%2Fpower_plant_design%3Aload-forecasting-benefits-security) — Power Plant Design, chapter 2 ## Related in other subjects - [Integrated reporting system](https://www.bctengineer.com/question.md?key=semester_7%2Fict_project_management%3Aintegrated-reporting-system) — ICT Project Management, chapter 11 - [Basis and advantages of decoupled load flow](https://www.bctengineer.com/question.md?key=semester_5%2Fpower_system_analysis_ii%3Adecoupled-basis-advantages) — Power System Analysis II, chapter 2 - [Avoiding load shedding and approach to 2020](https://www.bctengineer.com/question.md?key=semester_7%2Fhydropower_engineering%3Aload-shedding-approach-2020) — Hydropower Engineering, chapter 1 - [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