Let us consider an important moment after our work: precisely the day when your authorized installation is made official. From that point on, the Spanish electrical system orders the utility companies you buy your electricity from to also financially credit—as a discount—the energy that, being produced during the central daytime hours in the summer, is surplus to your roof and flows down into their general external grid.
A strict direct reduction
Following Spain's self-consumption regulations, when you enter the surplus market, your ability kicks in for the utility company to offset the kilowatts dumped in the morning alongside those purchased at night.
The bill will ultimately present credit balance lines in your favor, ensuring you pay a vastly reduced sum of the final consumption amount, without the need to resort to supplementary investments or additional maintenance of home accumulators in the early deployment phase.