On 31 March 2004, a transaction was concluded, the main consequence of which was that Energias de Portugal (EDP), the incumbent Portuguese electricity company, and Eni SpA, an Italian energy company, were to purchase GDP jointly.
Le 31 mars 2004, a été conclue une transaction dont il résulte, principalement, que Energias de Portugal (EDP), la compagnie historique portugaise d'électricité et Eni SpA, une compagnie d'énergie italienne, devaient acheter conjointement GDP.