Causes for Daily Changes in Demand

• The demand for electric power is constantly fluctuating, depending on the usage situation at the customer side.
• Causes for the fluctuation include home lighting and home air-conditioning, operation of office buildings and factories, etc.
• From accumulated data about past usage, it is also evident that power demand is affected by weather conditions, temperature, the day of the week (weekdays or weekends) and similar factors.
• Power companies project expected maximum power demands while taking data from external specialized weather forecasting organizations as well as weekday characteristics, recent usage ratios etc. into account.

Because weather and temperature forecasts refer to natural phenomena that sometimes differ considerably from projections, the expected maximum power demands will also change accordingly.