Red Eléctrica built a 400 kV substation there more than 10 years ago, designed to evacuate renewable energy.
According to El Periódico de la Energía, this is the origin of what is known as the first event the government is studying: the first drop in generation just prior to the blackout.
According to data provided by the system operator, several wind, solar thermal, and photovoltaic power plants are connected there. In total, nearly 700 MW of generation are connected to this substation, where they evacuate their energy.
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Specifically, there are 376 MW of wind power, 142 MW of photovoltaic power, and 150 MW of solar thermal power, totaling 668 MW connected. Other projects have permits for another 200 MW of wind and photovoltaic power.
According to this newspaper, all the generation connected there was disconnected after detecting an overvoltage exceeding the limits coming from outside the substation. This caused the protections to trip and disconnect the 668 MW.
According to Red Eléctrica, the transmission grid did not experience any incidents on April 28th. «The three generation loss events prior to the zero energy were due to causes beyond the control of the transmission grid,» explain sources from the company.
This loss of generation occurred there, but it could have happened anywhere, as it did seconds later at dozens of sites throughout the country.
