modalities of self-consumption

Modalities of self-consumption, everything you need to know

Today in our blog we will talk about the different modalities of self-consumption so that you can understand and assess which one best suits your needs. But first, let’s review what self-consumption is. In a few words, self-consumption is the production of electricity for your own consumption, specifically, the energy generated by your photovoltaic installation. Now you know the different ways to take advantage of the sun.

autoconsumo fotovoltaico

Modalities of self-consumption

There are two modalities of self-consumption: self-consumption without surplus and self-consumption with surplus. The main distinction between the two is their relationship with the grid. While the former is isolated, that is, without physical connection to the grid, the latter is connected to the grid.

*These modalities are already established in the Electricity Sector Law 24/2013, of December 26 and again in Article 4 of RD 244/2019. This regulates the conditions for self-consumption and enables the possible configurations for distributed generation facilities.

1. Modality of self-consumption WITHOUT surplus

The first type of self-consumption does not have surpluses; in order for this to occur, anti-spill systems are required. These prevent this unconsumed energy from being injected into the transmission or distribution network. Within this modality there is only one subject: the consumer.

In these solar plants, energy storage systems with batteries are often installed in order to optimally manage energy in the event of peak demand.

2. Modality of self-consumption WITH surplus

In this case, it is of interest that the surplus energy (not consumed) is injected into the grid. That is to say, part of the energy is destined for self-consumption, and the rest is exported to the grid, thus there are two types of subjects: consumer and producer. This modality is applied to two different installations, which we will discuss in the next point.

Nowadays, self-consumption installations connected to the grid are legal and any consumer can generate their own electricity. Moreover, after the elimination of the sun tax, a law under which the consumer had to pay a toll corresponding to the electricity produced, the self-consumption modalities have been improved.

modalidades de autoconsumo

Types of self-consumption facilities with surpluses

Within the modality of self-consumption with surplus, there are two types of installations: those that are eligible for compensation and those that are not. So let’s see what they are and their main advantages.

Self-consumption with surpluses UNDER compensation

This type of installation is of interest to you if the solar plant is in your home or industry with an installed capacity of less than 100 kW. This condition is essential in order to be eligible for compensation. By means of this modality, the supplier will compensate in your monthly electricity bill for the energy fed into the grid. This energy is injected into the grid when the consumer does not consider it sufficient to cover his consumption and chooses to buy energy from the grid.

This compensation will be valued according to the average hourly market price minus the cost of deviations or the agreement reached with the retailer. In addition, the benefits to which it may be entitled and the respective tolls will be applied.

Self-consumption with surpluses NOT eligible for compensation.

The requirement to be met by the solar plant in this modality is to have an installed capacity greater than 100 kW. In this case, the surplus energy will be injected into the grid, but not under the compensation scheme, but sold directly at the electricity market price. So yes, the energy produced in self-consumption photovoltaic installations can also be sold. 

The operation of these installations is simple, the energy that the consumer does not self-consume instantly will be fed into the grid and sold automatically. 

modalidad de autoconsumo con excedentes

In conclusion, all forms of self-consumption have their benefits for the consumer and their reduction of the electricity bill. But to choose the ideal one for you, you will have to take into account your energy needs as well as the installed power of your solar plant. Without further ado, if you have any questions or want to get into photovoltaic self-consumption, do not hesitate to contact Enertika.