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Is a self-consumption system profitable?
In the early days of photovoltaics, in 2006-2008, the government promoted with disproportionate aid, which had a direct impact on speculation, making the entire chain in the sector, had very high costs, which were amortized quickly and only with government aid.
Once the subsidies were cut, they WERE not profitable, but with the maturity of the market, the costs have been reduced to the minimum expression, being currently the most competitive technology for electricity generation.
Nowadays, without any help, with some basic and coherent considerations (no shadows, correct orientation…), together with a correct dimensioning between consumption and generation and a good design, it is undoubtedly a profitable option. Logically, if your consumption is minimal, you should analyze whether it is worth the installation. We advise you to always make a previous study so that you have all the options when making your decision.
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Will I be penalized if I install a self-consumption system in my house?
A few years ago it was penalized for generating electricity with the famous “sun tax”, which was finally repealed with the government of Pedro Sanchez in 2018.
It is true that it did not apply to powers below 10kw, but it spread a lot of fear among consumers, totally preventing the growth of this technology for self-consumption.
Currently, it is not that it is penalized, but it is being promoted and different measures are being taken to encourage self-consumption, such as reduction of IBI tax (even up to 50% for 5 years), or improvements in the administrative procedure…which will depend on each community.
Can I sell the surplus?
Although there are different procedures with their differences depending on the power and other aspects, we are going to focus on the residential sector (less than 15kw), so the general answer is “YES”.
The procedure for this type of self-consumption (less than 15kw) allows you to take advantage of surplus compensation, where your electricity company is obliged to pay you the surplus at a price obviously different from the one they charge you, ranging between 0.05€/kwh-0.07€/kwh depending on each company. To do this, you must legalize your installation correctly.
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