Gross demand and corrected demand

One of the indicators used to analyse the evolution of the country’s economic activity is the electricity demand, as the higher the electricity consumption, the greater the activity in the country.

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By the term ‘electricity demand’ we mean the amount of power requested from generators to meet the electricity supply requirements. In general it is expressed as the amount of electricity or power (W) divided by time, which is usually measured in hours (h).

Nevertheless, to make a comparison on equal terms between two consecutive years, it is necessary to consider a number of factors such as the working calendar, as this will affect working patterns, and the variability in seasonal temperature. This allows year-on-year data to be compared on a like-for-like basis.

When we apply these factors to the gross demand in order to make a more accurate comparison, the result is the corrected demand. This ‘corrected demand’, therefore, represents the amount of electricity that has been needed in a determined period of time if we apply the same conditions for working days and temperatures used in the same period the previous year.

For example, the peninsular electricity demand in the month of May 2015, after factoring in seasonal and working patterns (corrected demand) fell by 0.6% over the same month last year. Gross demand was 18,607 gigawatt hours (GWh), 2.1% higher than in May 2014.