Ancillary services

Information based on provisional data as of January 2023
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The impact of adjustment services on the average final energy price was 7.70 €/MWh, higher than the 4.23 €/MWh of 2021. This increase was due to the high prices recorded in all markets. A comparison of the share of this service in the final average price shows a slight increase in this year's price (3.8 % compared to 3.6 % the previous year).

In December 2022, ancillary services accounted for 8.7 % of the average final energy price, as more energy was scheduled due to restrictions in that month.

Weight of the impact of ancillary services on the final price

In 2022, the cost of ancillary services was 1,833 million euros, 78.8 % higher than in the previous year.

Cost of ancillary services in €M


Other: Includes non-fulfilment of balancing energy, deviation balancing, and deviations between systems.

The energy needs managed through ancillary services were 3.1 % lower than in 2021. Energy scheduled for security reasons was 20.2 % lower, due to the decrease in energy caused by technical constraints on the PDBF (27.2 %), while real-time technical constraints increased by 3.6 %. The balancing energy used has increased by 14.1 %, mainly as a result of the increase in secondary regulation energy and replacement reserves.

The energy volume due to technical restrictions to the PDBF represents 29.2 % of the total ancillary services, lower than the 38.9 % it represented last year and far from the 51 % of 2020.

Energy requirements covered by ancillary services


The weighted average prices of the ancillary services of the peninsular system have resulted as follows:

Average weighted prices of ancillary services of the peninsular electricity system


Replacement reserves: The RR-type balancing energy service has a single price. The value represented in the table corresponds to the weighted average price according to the direction needed by the Spanish Electricity System.

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