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Adjusting the power capacity to real needs to avoid contracting excessive kW will mean a saving in the electricity bill
The power capacity is the maximum amount of electricity that can be consumed at any one time in a dwelling, in other words, the capacity to connect various devices simultaneously. It depends on two factors: the type and quantity of electronic appliances there are in the dwelling and the power these appliances need.
Your electrical installation certificate indicates the maximum power, and also states whether you have a single-phase (the most usual for domestic purposes) or three-phase installation. The maximum power is a limit which cannot be exceeded, because otherwise your installation will be overloaded and automatically trip the power control switch (PCS) or circuit breaker. However, depending on the electricity you consume and the appliances you use, the contracted power capacity can be reduced if you think it is too high.
You should bear in mind that, according to the National Markets and Competition Commission, each kW of power costs €45.23 a year, and that the amount of power capacity contracted is a decision made by customers in accordance with their needs.