If you prefer to always view the website in English, please click here.

Self-Consumption Surpluses: sell the solar energy you have left over

The idea behind self-consumption is simple: you generate your own energy and then use it. But what happens when you generate more energy than you need? Can you "make money" from this surplus?

More and more people are deciding to take up self-consumption and install solar panels to generate their own energy.

The idea is simple: you generate your own energy and then use it.

But what happens when you generate more energy than you need?


Your surplus energy can help you save on your bill

One of the questions newcomers to self-consumption most frequently ask is: how can I sell my excess power to the grid to help me save on my electricity bill?

There are two important options for your surplus energy:

  1. With simplified compensation for surpluses: fast and simple. You save because the surpluses are credited on your bill. You only have to meet the established conditions and contract a solar energy tariff. Each month you will be credited on your bill for the value of the surpluses (they are not subject to taxes), taking into account the limit set by the regulation, which establishes that in each invoice the economic value of the surplus energy may not be higher than the economic value of the cost of the energy consumed from the grid. You will be able to save on the energy term in your bill. Here, we will explain the sections on your bill to help you fully understand your electricity bill.
  2. Without compensation: here we are not talking about saving but rather about selling energy to the electricity market. To do this, you need to register as an energy producer, a complex procedure of little interest for most domestic self-consumers. 


Simplified compensation for surplus

This is the option we recommend. It is the most common choice for electricity self-consumption users to save money through the surplus energy from their solar panel installation. 

Here's how it works:

  • The energy produced that is not consumed is fed into the grid, which is called a "surplus".
  • Each billing cycle, you will receive compensation for these surpluses on your bill in the form of a discount, which will result in savings. The amount of these savings will depend on the kWh fed into the grid and the compensation price applied.
  • In the calculation of the surplus compensation, there is a regulated limit called the "compensation limit", which means that you cannot be financially compensated with a value higher than the kWh you have consumed from the grid. This limit does not always appear on the bill; it only applies when the amount of injected energy exceeds the amount of energy consumed from the grid.

Here, we will explain the sections on your bill to help you fully understand your electricity bill.

If you are interested in surplus compensation, the process to join is quick and simple, in just four steps:

  1. Contract the installation of photovoltaic solar panels.
  2. Legally register the installation with the appropriate regional authority: This is where you inform the regional authorities that you would like to benefit from simplified compensation for surpluses.
  3. The regional authority will send the details of your photovoltaic installation to the electrical distributor in the area, and they will then inform your electricity retailer. If you have any doubts, the following content shows the differences between a distributor and a retailer.
  4. Once the installation has been registered, we will contact you through our customer service channels to verify that the registered data is correct: type of self-consumption, CAU (Self-consumption code used to register the self-consumption installation with surplus compensation) and installed power. You will only need to validate them to activate a Self-consumption solar tariff contract.

How to view surpluses on your bill

Throughout the month, your photovoltaic installation may actually produce more energy than you use. What happens in that situation is that the surplus energy is transferred to the distribution network. You get financial compensation for these surpluses.

Here is an example of how surplus compensation appears on your bill:

  • If you have any questions about the different sections that make up your bill, check out this content where we will help you understand your electricity bill.

Current regulations also explain why the price at which you sell your surplus energy is lower than the price at which you pay for the energy you consume from the grid. The access tariff for the electricity grid and the cost of producing electricity are the reason for this price difference.


Take advantage of the tax benefits

Currently, virtually all city councils offer discounts on municipal taxes for the installation of solar panels.

Sometimes this discount may include a 50% reduction on property tax (IBI) for 10 years.

advise icon go to the advise Facebook icon go to Facebook Twitter icon go to Twitter Youtube icon go to Youtube Messenger icon go to Messenger Linkedin icon go to Linkedin Instagram icon go to Instagram Shared Link icon Go to the shared link Checkmark Success icon Checkmark Success down arrow icon down arrow Previous Go to previous Next Go to the next close icon close add icon add up arrow icon up arrow oblique arrow icon look obliquely Arrow down icon Arrow down search engine icon search search engine icon search share icon share filter icon filter email icon send mail email icon email phone icon phone fax icon fac print icon print play icon play user icon go to the user section error icon an error has occurred info icon information thumb up icon like thumb up icon like thumb down icon don't like thumb down icon don't like clock icon Clock Lamp icon Lamp List icon List Map icon Go to the map Phone icon Phone Emergency icon Emergency Pause icon Pause Play icon Play Logout icon Sign off Phone icon Phone