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Define load uncertainties

Short answer

Load uncertainty is the possible difference between forecast and actual demand caused by economic, weather, policy and forecasting errors. Short-term deviations are covered by spinning reserve; long-term errors by planning margins, scenario forecasts and probabilistic reliability methods such as LOLP.

Define load uncertainties (on the basis of integrated system planning approach).

Load uncertainty is the difference between the forecast load used in planning and the actual load that occurs, caused by factors that cannot be predicted exactly. In integrated system planning it is treated as a risk that must be covered by reserve and by flexible plans.

Sources

  • Economic growth: GDP, industrial growth and electricity price changes.
  • Population and urbanisation: migration, new settlements.
  • Weather: temperature, rainfall and seasons change heating, cooling and irrigation load.
  • Policy and technology: electric cooking, EV growth, efficient appliances, rooftop solar.
  • Forecasting error: errors in data and models.

Types

  • Short-term uncertainty: hourly/daily deviations due to weather and consumer behaviour; covered by spinning reserve.
  • Long-term uncertainty: error in growth rate over years; covered by planning margin and scenario (high/base/low) forecasts.

Handling in planning

Forecasts are made with high, base and low scenarios; reserve margin, probabilistic methods (LOLP) and sensitivity analysis are used so that the expansion plan stays reliable and economic under any likely load.

Example: If Nepal's EV and induction-cooking load grows faster than forecast, the planned capacity may fall short in winter evenings.

✓ Answer checked by Claude Opus 5.5 (high effort)

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