In the last two years, solar panels have multiplied on the roofs of Spanish single-family homes but collective self-consumption, for example, for blocks of flats, has not yet taken off.. An alternative to this difficulty could be a new type of self-consumption that is trying to open in Spain. These are plug-in solar panels, which can be installed on balconies. They are already very common in Austria, Germany and Italy and now they are looking for their place here, now with the support of the reform of the European electricity market, which asks countries to regulate them and create special electricity rates for surpluses.. On the contrary, experts warn that its low power could not only not be useful, but could be counterproductive for 'classic' self-consumption.
Plug-in photovoltaic panels are a reality in central European countries but still a rarity in Spain. The reform of the electricity market that was closed a few weeks ago in the EU could give them a boost if governments, including the Spanish one, obey one of its provisions, which indicates that “they can promote the introduction of mini plug-in solar systems with capacity up to 800 watts on or inside buildings.”
This request was introduced at the last minute by the European Parliament in the final negotiation with the Member States and is due to an express request made by the Greens group, although it was limited to an invitation to countries like Spain, which do not have a regulation for this type of devices. The initial intention of the European Parliament was that, more than a possibility or an option, the impulse was an obligation.
As agreed in the end, the EU considers that plug-in solar panels are a system that “together with others and other technologies, could contribute to increasing the consumption of renewable energy and its commitment to the energy transition”. For this reason, governments should alleviate administrative and technical burdens and regulatory authorities should offer rates for the injection into the network of the electricity generated by these plug-in panels and a methodology to calculate them, even pointing out that “depending on the situation of each Member State “, these rates should be “very low or even zero.”
Low power, self-installable and for the balcony
The technical ease or especially low electricity rates to operate these devices plugged into the network is something that does not exist in Spain.. This is confirmed by EET, an Austrian company that recently arrived in the Spanish market.. The equipment it distributes is “low power”, with a maximum of 800 watts and consists of one or two solar panels – each of 370 watts – and one or two inverters of 300 or up to 600 watts of power to convert direct current. generated by the panels in alternating current, which is used in homes.
The panels can be plugged into power from a domestic outlet, are “self-installable”, that is, they do not need a professional, and can be installed on the balcony, a garden, a wall or any other place where it receives sunlight, with the best guidance possible. The cost of these devices ranges between 700 and 1,000 euros.
Last year, EET sold 17,570 kits in the countries where it has been operating for years – Austria, Germany, Italy and Switzerland – and where it notes a “growing importance” of plug-in panels as a good alternative to roof tiles. For people who typically live in multi-story buildings that don't have as much space or are looking for more affordable devices. The sale of these kits also in Spain is the previous step to begin marketing its “star product” this spring, a storage unit for plug-in panels.
Most cumbersome process in Spain
From its still incipient experience in Spain, this company notes some particularities that are very much in line with the request included in the reform of the EU electricity market for governments to facilitate plug-in solar panels.. “Spain stands out from the other countries where we are active for having the majority of regulations for these installations, which are actually so loved for being so simple for the end customer,” says EET after analyzing the requirements for installing plug-in solar panels in the different markets in which it is present.
As explained by the company, here it is much more cumbersome than in other countries, because it is necessary to “legalize the installation” by obtaining a specific Electrical Installation Certificate, which requires that an authorized technician come to verify the installation.. On the contrary, in Austria it is not necessary to do this procedure if the device does not exceed 800 watts of power and it is enough to inform the electricity distributor through its website or by email that this type of plates has been installed.. Those who live in apartment buildings also have to consult with the administrator to install them due to changes in the external appearance of the property.
Germany has a very similar system and you only have to notify the plate to the electricity company and include it in the Central Market Data Registry. Something similar also happens in Italy, where there is a “single registration” that can also be done online.
According to the EET comparison, in Spain it is also necessary to install – with an authorized technician – a device to prevent the discharge of surpluses into the network, something that is not necessary in Germany, Austria or Italy, also because there are usually no surpluses. on these low power boards.
Discourage self-consumption
Precisely the low power of these plug-in plates is one of the elements that raises the distrust of some experts in this solution, who believe that it could frustrate the expectations of those who install them in their homes and, with this, extend this disappointment to all self-consumption. .
“They have very little power and are quite inefficient,” warns Raquel Paule, president of the Renovables Foundation, on whom a good part of Sumar's environment and energy program for the 23J elections rested.. “We continue to focus on the typical self-consumption of roof tiles, it is much more efficient.”
Paule explains that the problem with them is that 800 watts “does practically nothing”, compared to the 2000 watts that are usually installed on roofs to cover only part of the electrical demand of homes.. For this reason, he believes that plug-in plates do not even make a “big difference” in the bill in terms of savings and can be “negative” and “lead to error”, that users “expect one thing and find another and conclude that everything “self-consumption is not worth it”. Instead, it is committed to promoting energy communities and collective self-consumption, so that people who live in apartment blocks with poorly oriented roofs or where they do not have space can use it.. For this reason, he believes that solutions such as plug-in plates are “patches” that “have a negative rebound effect” on self-consumption.
Despite these misgivings, the inclusion of plug-in solar panels of up to 800 watts in the new EU electricity market is seen as one more element in a package aimed at making life easier – and cheaper – for the consumer.. This is how the European Parliament's rapporteur for the reform, Nicolás González Casares, sees it, who was the one who received the request from the Greens to include them, who sought agreement between the groups so that it would be part of his mandate and who later fought with the governments so that, although attenuated, the final text would include an invitation to Member States to facilitate its implementation, with special rates that could even be zero euros.
In that final negotiation, Parliament also managed to “go further” in the right to share self-produced energy, which if combined with differentiated contracts – which will allow the consumer to have several depending on what they are going to use the electricity for -, with The generalization of dynamic rates -instead of a fixed price- or with the support to make demand more flexible will allow each household to take advantage of the option that best suits them.