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Need for accurate load forecasting

Short answer

Load forecasting predicts future peak MW and energy, forming the basis for generation, transmission, financial, operational and trade planning. Over-forecasting causes idle capacity and high tariffs; under-forecasting causes shortages and load shedding. Accurate forecasts minimize total cost, maintain reliability, and time long-lead projects correctly.

Why load forecasting is important in system planning? Explain the need for accurate load forecasting.

Load forecasting is predicting the future electrical demand (peak MW and energy MWh) of a system for a given period. It is the starting point of all power system planning and operation.

Why it is important in system planning

  • Generation expansion: decides how much new capacity, and of what type, is needed and when.
  • Transmission and distribution expansion: decides new lines, substations and their ratings.
  • Financial planning: utility investment, tariff setting and PPA signing depend on future sales.
  • Operation: unit commitment, economic dispatch, maintenance scheduling and reserve planning.
  • Fuel and energy trade: import/export contracts (e.g. Nepal–India power trade).

Need for accurate forecasting

Forecast errorResult
Over-forecastExcess capacity built; capital idle; high tariff; energy spill (e.g. wet-season spill in Nepal)
Under-forecastShortage, load shedding, costly emergency import or diesel; poor reliability

Accurate forecasting therefore:

  1. Minimises total cost by avoiding both over- and under-investment.
  2. Keeps the reliability target (LOLP, reserve margin).
  3. Allows correct sizing and timing of long lead-time projects (hydro takes 5–10 years).
  4. Helps secure finance, since lenders rely on demand projections.
  5. Supports secure daily operation with the right spinning reserve.

✓ Answer checked by Claude Opus 5.5 (high effort)

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