How to change your contracted service capacity

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How to change your contracted service capacity


Your bill has two main components:

  • Electricity consumption: this is variable, although you can control it. This will change every month, and this part of the bill will increase the more kWh you use.
  • Contracted service capacity: this is a fixed charge and depends on the kW of service capacity contracted. It will be billed on a straight-line basis month to month, although you can choose to contract more or fewer kW.


How to know whether you need more or less service capacity

There are easy “amateur” ways of working it out: if your circuit breaker never trips, it’s likely you have some margin to reduce service capacity. However, you’re already at the limit if it frequently trips.

Whatever the case, changing service capacity is not a decision you can take lightly. It’s better to forget about doing it yourself, and leave it to the professionals. We recommend you ask an approved installer to take a look at your set-up.

Endesa can help if you have any questions (after opening the contact form, select “Consultation", the category "Advice" and the subject "Doubts about the service capacity I need").

Contracting more service capacity than you need:

Unnecessarily higher bills.

Contracting less service capacity than you need:

Interruptions in supply, which will mean you have to increase the service capacity again (at an extra cost).


We recommend you use our service capacity calculator to get a general idea:



Cost of altering your service capacity

The distributor is responsible for supplying energy to your home. You can’t choose distributors because they are assigned by area. Your distributor may charge you for making changes to service capacity. Details of which distributor covers each area are provided here:


Your distributor will charge you:

  • Around 11 euros for reducing service capacity, irrespective of the size of the decrease. After the alteration, you’ll be sent a bill for “connection charges”.
  • Approximately 45 euros for each kW you increase service capacity. After the alteration, you’ll be sent a bill for “access and extension charges”.
  • Depending on your distributor, you may be charged for other concepts or be required to provide a deposit.

Be careful! Sometimes what appears to be cheap at first ends up costing a lot. If you reduce service capacity by too much, you might not have enough (your circuit breaker may trip when you turn on several appliances at the same time). You’ll have to increase it again and will pay quite a bit more than you had expected. Distributors are also only obliged to alter your service capacity once a year, so you may encounter problems if you need to make more changes.

You may also have to pay for a new Electrical Installation Certificate on top of all these charges (which costs 50-200 euros).


What is the certificate and how much does it cost?

It’s a document that certifies your supply is in working order. In this section, we explain why the Electrical Installation Certificate (CIE) is so important.

Your distributor requires one in the following circumstances:

  • More than 20 years have elapsed since the last one was issued.
  • The service capacity you have contracted is higher than that stipulated on your certificate.
  • If you have made a change in the electrical voltage.
  • You ask for the service capacity to be changed for a new property that has never been lived in.
  • If there's a change in Business Activity.
  • You live in the Canary Islands and want to alter service capacity.

You’ll need to call an approved technician to get a new certificate: charges vary a lot (50-200 euros), so we recommend asking for several quotes. If you live in Catalonia, these charges are higher if you request another type of certificate (Blue Certificate or BRIE - Electric Recognition Bulletin -).

Once you have a certificate, please send it to us at the following email address: (you have 30 days to send us the certificate after applying for your service capacity to be changed).


What you can save by reducing service capacity

Decreasing your service capacity will have an immediate effect on your bill, and will continue to do so because it means reducing a fixed charge.

For small to medium premises, you’ll save around 5 euros a month or 60 euros per annum for each service capacity band you drop down to.


Change service capacity in five easy steps

Here’s what you need to do to change service capacity with Endesa:

  1. Enter the Contracts section of your Customer Area (if you’re not registered or logged in, you’ll need to do so).
  2. Click on your contract and all your details will come up on screen.
  3. Click on "Change" in the section "Service capacity and voltage".
  4. Select the service capacity you want and accept the Contract Terms.
  5. Click on "Save changes".


The best tariffs for your service capacity

Endesa offers tariffs that are tailored to your consumption profile. Use our service capacity calculator to find out how many kW you should contract. Once you’ve decided, select the group of tariffs designed for your service capacity:


Tariffs for less than 10kW


Tariffs for more than 10 kW