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Find out what electrical power rating you need

What is the estimated power rating your house needs? What does it depend on? Through some simple examples we help you understand the key concepts regarding electrical power ratings and how you can choose the one that best suits you.

Choosing the right power rating that suits your way of life and allows you to save is a important question. To start with, keep in mind that this power rating is the amount of kilowatts (kW) that can be simultaneously demanded from your home's mains supply. If you turn on two powerful appliances at the same time, a 2.2 kW oven as well as a 2 kW air conditioner, you will be asking for a power capacity of 4.2 kW. However, if your contracted capacity is only 4kW, you will flip the trip switches and be left without power. This is what will happen to you every time you simultaneously turn on these two appliances.

However, you must bear in mind that the solution is not to contract more capacity, since, the more capacity you contract, the higher your monthly bill will be. At the end of the day, consumption is something that is under your control, however, when it comes to controlling expenditure, power is a fixed expense. Therein lies the dilemma: How to maintain my lifestyle while adjusting my house’s power rating to the greatest degree to reduce the bill?

 

What electrical power rating do I need?

This is where the simultaneity factor comes into play. It is an estimated calculation that takes into account the wattage of the electrical appliances you have at home, the use you give them and the maximum contracted power (which you can consult in the electrical bulletin or CIE), among other factors. Thanks to this calculation we will be able to find out what power rating you will need in your home.

Keep in mind that 11% of Spanish households have a power rating contract that is higher than their real needs. The average power rating in Spanish homes ranges between 4.4 kW and 4.6 kW. However, it is essential that you are well advised and consult Endesa's experts, since they are the ones who will best resolve your doubts in this regard. Do not make any decisions without considering their recommendations.

To serve as a guide, we have developed four standard cases so that you can understand how the necessary power rating is estimated according to each person's lifestyle. We do not all use appliances in the same way, we do not all use them as often, nor do we need appliances to have the same wattage. Knowing this, take a look and you may feel that one of these cases sums up your type of usage. 

Javier, lives alone

Javier lives alone in a small studio flat. He works in an office, so he spends most of the day away from home. However, this means that, in the few hours he spends at home, he uses his appliances simultaneously.

In his home, he has:

  • A small washing machine 1.7 kW
  • A fridge 0.3 kW
  • A vitroceramic hob with two rings 1 kW
  • A small microwave 0.9 kW
  • A toaster 0.8 kW
  • Air conditioning 1 kW
  • A television 0.3 kW
  • A computer 0.25 kW

It is very likely that Javier will return home in the summer, put the washing machine on with his gym clothes and start cooking dinner and lunch for the next day while he watches a series or listens to some music on his computer. In that case, it would be common for him, in addition to having the light on, to have most of his appliances on and running. The sum total gives us about 3.4 kW. Javier would have to consult his electrical newsletter or CIE and contact Endesa's experts for advice on how he can optimise his power usage.

 

Laura, Óscar and Walter, shared flat

These three flatmates have very different schedules: Laura works at home with her computer, Óscar is out almost all day and only stops at home for dinner and to sleep and Walter works nights.

In addition, in their case, they do not have central heating, so they have to add the use of electric heating and an electric water heater to their power needs.

In their home they have:

  • A washing machine 1.7 kW
  • A fridge 0.3 kW
  • A vitroceramic hob with four rings 1 kW
  • An extractor hood 0.02 kW
  • A small microwave 0.9 kW
  • A toaster 0.8 kW
  • A juicer 0.03 kW
  • A 1.3 kW oven
  • An iron 1 kW
  • Air conditioning / electric heating 1.8 kW
  • A television 0.3 kW
  • Computer 1 0.25 kW
  • Computer 2 0.25 kW
  • Computer 3 0.25 kW
  • A 0.7 kW tumble dryer
  • A shaver 0.7 kW
  • An electric water heater 1.5 kW

The truth is that there are many times when two of the inhabitants of the apartment coincide, so they make simultaneous use of electrical appliances. Laura starts working while Óscar prepares breakfast and Walter takes a shower. If it's winter, they turn on the heating, if it's summer, the air conditioning, since Laura stays at home all day. However, it would be very unusual for them to operate absolutely all the electrical appliances in their house, so those which they use less often (hair-dryer, shaver, iron, etc.) would not be included in the sum total. The estimated power rating would be about 4.6 kW. Now it is Laura, Óscar and Walter’s turn to think about whether they can organise themselves and not use the electrical appliances at the same time to lower the simultaneity factor, if they want to lower the power rating and save a few euros on their monthly bill. Should they consider modifying the power rating that appears in their contract, it is time to seek advice from Endesa's experts.

 

Sonia and Yaiza

This couple live together in a one bedroom apartment. They both spend much of the day out at work. However, this last year they opted for teleworking, which is why they are now almost always at home, using their computers and many other household appliances simultaneously. 

In their home they have:

  • A washing machine 1.7 kW
  • A fridge 0.3 kW
  • A vitroceramic hob with four rings 1 kW
  • An extractor hood 0.02 kW
  • A microwave 1 kW
  • A toaster 0.8 kW
  • A juicer 0.03 kW
  • A 1.3 kW oven
  • An iron 1 kW
  • A blender 0.3 kW
  • A fan 0.5 kW
  • A 1kW oil filled radiator
  • A television 0.3 kW
  • Computer 1 0.25 kW
  • Computer 2 0.25 kW
  • A 0.7 kW tumble dryer
  • A hair straightener 0.7 kW

As they are almost always in their home, Sonia and Yaiza almost always have their radiator or fan on, depending on the time of year. Also, during the day they both turn on their computers to work. While one is showering, drying her hair or using the straightener to straighten it, the other prepares breakfast, using several kitchen appliances at the same time. The estimated power rating will be 4 kW. This couple can review their routines to spread the use of their appliances over time. For example, Sonia can wait for Yaiza to finish preparing breakfast to dry her hair. In this way, they could reduce this power rating and, therefore, their monthly bill. Consulting with an Endesa expert about their power rating will be of great help before taking any other steps.

 

Juanjo, Isa, Tiago and Zoe

Juanjo and Isa have two young children, Tiago and Zoe. They live in a four bedroom house. Isa goes out to work, but Juanjo is at home all day. The little ones go to school.

In their home they have:

  • A washing machine 1.9 kW
  • A fridge 0.5 kW
  • A vitroceramic hob with four rings 1 kW
  • An extractor hood 0.02 kW
  • A microwave 1 kW
  • A toaster 0.8 kW
  • A juicer 0.03 kW
  • A 1.3 kW oven
  • An iron 1 kW
  • A 1 kW food processor
  • A 1kW vacuum cleaner
  • Air conditioning 1.8 kW
  •  A television 0.3 kW
  • Computer 1 0.25 kW
  • Computer 2 0.25 kW
  • A games console 0.6 kW
  • A 0.7 kW tumble dryer

During the time that Isa is not at home, Juanjo takes the opportunity to cook, clean the house and do the laundry. Thus, he avoids simultaneously connecting electrical appliances. However, in the afternoons, it is very normal that they are all connected to their digital devices, such as computers and the games console. The estimated power rating for this family is 4.6 kW, provided they are organised so as not to operate a lot of electrical appliances at the same time. Of course, if they have any questions, contacting Endesa's experts is always one guarantee of making the best decisions.

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