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Endesa - Electricity, Gas, People

How much power do I need in my house?

Published on March 15, 2017


Upgrading the power supply in your home may be an unnecessary expense, but if your power supply is too low, you may not be able to carry out everyday activities as normal. Beware of requesting a change of power supply without the help of an expert: the cost of the various procedures could eat away at potential savings.

Why does my electricity trip whenever I have guests for dinner?

Why does the electricity go off when the air conditioning unit is switched on and I use the vacuum cleaner?

Why can’t I use the washing machine when I have a cake in the oven?

The answer to these questions is not a poltergeist; it is your power supply.

The contracted power is the amount of kilowatts (kW) that you can simultaneously access from your home’s electrical grid. For example: if you have your electric heating on, you are using the washing machine and your oven, the approximate power needed by your home will be between and 4 and 6.9 kW. If you have contracted less than 4 kW, you will probably be left in the dark until you switch off your washing machine, oven or heating.

The more power you have, the more electrical appliances you will be able to switch on at the same time without tripping the switch. But the more power you have, the more you will pay each month, since your electricity bill is divided into your consumption (which you can control by being more efficient) and the power (which is a fixed cost and increases depending on the kW you have contracted).

Power based on property size

When it comes to contracting the power supply for a property, various factors should be taken into account. The main ones are the size of the property, the number of electrical appliances used on a normal basis and the heating system:

  • For a couple living in a 60 or 70 square metres apartment, the normal power is around 3.45 kW. But if the apartment has a glass-ceramic hob or air conditioning, this may need to be increased to 4.6 kW”.
  • For three or more people living in an apartment of around 100 square metres, the ideal power would be around 4.6 kW.
  • Properties that are larger than 160 square metres (or that have electric heating or air conditioning installed) will probably need 6 kW or more.

The higher the power, the higher the cost

The higher your power is, the higher the fixed amount you have to pay each month. Therefore, reducing an unnecessarily high power is one of your main options for cutting down the cost of your electricity bill.

But, what is your power right now? If you are an Endesa customer, you simply have to access your Customer Area to find out (you will need to log in and, if you have not already done so, register).

Less power does not always mean greater savings

There is no doubt that reducing your power can help you save money: around 60 euros a year for each power interval you drop. But all these savings will disappear if you are left short after dropping your contracted power. This could leave you without electricity when you switch on various electrical appliances at once. If this happens, you will have to increase the power again, which will cost money.

In the best case scenario, you would have to pay around 50 euros to increase the power again. In the worst case scenario, more than 200 euros. Depending on your situation, what you save by dropping your contracted power could disappear or even end up being more expensive.

If you are left short after dropping your power, the cost of re-uploading will eat your savings

Who chooses the power?

Consumers establish the power they wish to contract with the company. Likewise, consumers can change the power depending on their requirements however; the distribution company only has to accept one change of power per year.

How to calculate the power supply you need

You simply need to know the square metres of your home, the electrical appliances you have installed and the type of heating in the property. Enter these details in Endesa’s power calculator.

How do you know if you have more contracted power than you need?

Switch on all the electrical appliances in your home. If the Power Control Switch does not trip, you probably have more power than required.


Ask the professionals for help.

If in doubt, you can ask an authorised Endesa installer for no-obligation technical advice, who will check your property’s records and meticulously assess all the requirements.

The following form includes the category “Advice” under the type of "Query" and the subject is "Questions regarding how much power I need":


And if you are sure you want to reduce your electricity consumption, you can also access our tariff programme which will help you save money without even noticing.