The liberalisation of the electricity sector, which began in 1997 and was completed in 2013, introduced a series of important changes with the aim of opening up the sector to other companies, increasing competition and improving the overall efficiency of the sector by separating activities into four activity axes: generation, transmission, distribution and marketing.
Transmission and distribution are regulated activities that require a specific administrative authorisation and supervision, which in itself constitutes a natural monopoly formed by large companies in the sector.
As for generation and marketing, these are activities that can be carried out by any company that meets a series of requirements and rules of operation; in this case, we can, in fact, speak of partly-liberalised activities.
As a consequence of the above, and in line with the Law regulating the electricity sector, the market is structured in daily and intraday market (OMI, Polo Español S.A. – OMIE) and futures market (OMI-Polo Portugués, SGMR – OMIP), in which the purchase and sale of electricity is negotiated by all market players (producers, traders and direct consumers, among others).