www.ree.es/en distribution companies, operators of the European energy contracting markets, participants in the coupling processes of the organised markets (OMIE, EPEX and NordPool, among others), providers of system ancillary services; suppliers of the interruptibility demand-side management service; the company (JAO, S.A.) that performs the functions as the European Single Allocation Platform (SAP) for cross-border electricity exchange capacity auctions, and those agents/entities that purchase exchange capacity at said auctions.