CTSOSEI In this committee, organised bimonthly by Red Eléctrica, market subjects and regulatory bodies are provided with information on the operation of the electricity systems of the Iberian Peninsula and information on the ancillary services markets for electricity systems in Spain and Portugal, and energy exchanges through the interconnections between the Iberian electricity systems. Reporting to ACER In application of the Commission Implementing Regulation (EU) is reporting to ACER (Agency for the Cooperation of Energy Regulators) the results of the explicit capacity auctions and the programme’s in-use nominations of the capacities reported by the participants in said auctions.