From May to October, the so-called ‘reinforced’ scheduling represented 2.34% of the total costs of the Spanish electricity system, which exceeded €18 billion1 during this period. Out of that total, reinforced scheduling amounted to €422 million.

• Specifically, the analysis for October shows the following figures:
• The cost of reinforced scheduling represented 2.9% of the final energy price for the month (€95.01/MWh)2.
• This means that for a customer under the VPSC tariff with an average monthly consumption of 300 kWh, reinforced operations had an estimated cost of 3 cents per day in October, according to Red Eléctrica's estimates.
• It is important to note that direct comparisons with 2024 are misleading, since the electricity system is constantly evolving. Every day, it faces new operating conditions that are not equivalent to those of the previous year.
   

On the other hand, in the first nine months of the year, reinforced scheduling accounted for 0.8% of the volume of non-dispatchable renewable energy that could not be integrated into the system for safety reasons. These are the so-called ‘technical curtailments’ or grid technical restrictions, which have increased this year mainly due to the rise in installed renewable capacity.

Red Eléctrica does not have estimates for the so-called ‘economic curtailments’, i.e., energy that is not integrated into the system because it cannot be matched in the electricity markets for reasons unrelated to Red Eléctrica.

The system operator (SO) has been applying this scheduling concept since 30 April and intends to maintain it —with the adjustments required for a system in constant transition— until all regulatory measures are approved and implemented, several of which were proposed in its incident analysis report. It will also remain in place until the phenomenon that caused the abnormal and forced oscillation is fully understood and until the behaviour of system participants complies with regulatory voltage control requirements. This approach will help mitigate both rapid voltage fluctuations and their consequences, particularly the potential disconnection of generation facilities connected to distribution networks that the SO cannot directly monitor —a vulnerability that became evident during the incident on 28 April.

Notas:

^{1 Calculation based on actual settlement data from the CNMC for the electricity sector from May to August, as well as on Red Eléctrica's estimates for September and October, except for generation costs, which were calculated based on information published in the ‘Datos’ section at www.ree.es.
2 According to the CNMC resolution, the final energy price consists of several components, including the wholesale market price and ancillary services (such as technical restrictions, reserve costs, imbalance costs, etc.).}