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Recitals 3, 4, 7, 9 to 12, 15, 16, 21, 25, 26 and 44 in the preamble to Directive 2009/72/EC of the European Parliament and of the Council of 13 July 2009 concerning common rules for the internal market in electricity and repealing Directive 2003/54/EC (OJ 2009 L 211, p. 55) read as follows: ‘(3) The freedoms which the Treaty guarantees the citizens of the Union – inter alia, the free movement of goods, the freedom of establishment and the freedom to provide services – are achievable only in a fully open market, which enables all consumers freely to choose their suppliers and all suppliers freely to deliver to their customers. (4) However, at present, there are obstacles to the sale of electricity on equal terms and without discrimination or disadvantages in the [European Union]. In particular, non-discriminatory network access and an equally effective level of regulatory supervision in each Member State do not yet exist. ... (7) The Communication of the Commission of 10 January 2007 entitled “An Energy Policy for Europe” highlighted the importance of completing the internal market in electricity and of creating a level playing field for all electricity undertakings established in the [European Union]. The Communications of the Commission of 10 January 2007 entitled “Prospects for the internal gas and electricity market” and “Inquiry pursuant to Article 17 of Regulation (EC) No 1/2003 into the European gas and electricity sectors (Final Report)” showed that the present rules and measures do not provide the necessary framework for achieving the objective of a well‑functioning internal market. ... (9) Without effective separation of networks from activities of generation and supply (effective unbundling), there is an inherent risk of discrimination not only in the operation of the network but also in the incentives for vertically integrated undertakings to invest adequately in their networks. (10) The rules on legal and functional unbundling as provided for in Directive 2003/54/EC have not, however, led to effective unbundling of the transmission system operators. At its meeting on 8 and 9 March 2007, the European Council therefore invited the Commission to develop legislative proposals for the “effective separation of supply and generation activities from network operations”. (11) Only the removal of the incentive for vertically integrated undertakings to discriminate against competitors as regards network access and investment can ensure effective unbundling. Ownership unbundling, which implies the appointment of the network owner as the system operator and its independence from any supply and production interests, is clearly an effective and stable way to solve the inherent conflict of interests and to ensure security of supply. For that reason, the European Parliament, in its resolution of 10 July 2007 on prospects for the internal gas and electricity market [OJ 2008 C 175 E, p. 206] referred to ownership unbundling at transmission level as the most effective tool by which to promote investments in infrastructure in a non‑discriminatory way, fair access to the network for new entrants and transparency in the market. Under ownership unbundling, Member States should therefore be required to ensure that the same person or persons are not entitled to exercise control over a generation or supply undertaking and, at the same time, exercise control or any right over a transmission system operator or transmission system. Conversely, control over a transmission system or transmission system operator should preclude the possibility of exercising control or any right over a generation or supply undertaking. Within those limits, a generation or supply undertaking should be able to have a minority shareholding in a transmission system operator or transmission system. (12) Any system for unbundling should be effective in removing any conflict of interests between producers, suppliers and transmission system operators, in order to create incentives for the necessary investments and guarantee the access of new market entrants under a transparent and efficient regulatory regime and should not create an overly onerous regulatory regime for national regulatory authorities. ... (15) Under ownership unbundling, to ensure full independence of network operation from supply and generation interests and to prevent exchanges of any confidential information, the same person should not be a member of the managing boards of both a transmission system operator or a transmission system and an undertaking performing any of the functions of generation or supply. For the same reason, the same person should not be entitled to appoint members of the managing boards of a transmission system operator or a transmission system and to exercise control or any right over a generation or supply undertaking. (16) The setting up of a system operator or a transmission operator that is independent from supply and generation interests should enable a vertically integrated undertaking to maintain its ownership of network assets whilst ensuring effective separation of interests, provided that such independent system operator or such independent transmission operator performs all the functions of a system operator and detailed regulation and extensive regulatory control mechanisms are put in place. ... (21) A Member State has the right to opt for full ownership unbundling in its territory. Where a Member State has exercised that right, an undertaking does not have the right to set up an independent system operator or an independent transmission operator. Furthermore, an undertaking performing any of the functions of generation or supply cannot directly or indirectly exercise control or any right over a transmission system operator from a Member State that has opted for full ownership unbundling. ... (25) The security of energy supply is an essential element of public security and is therefore inherently connected to the efficient functioning of the internal market in electricity and the integration of the isolated electricity markets of Member States. ... (26) Non-discriminatory access to the distribution network determines downstream access to customers at retail level. The scope for discrimination as regards third-party access and investment, however, is less significant at distribution level than at transmission level where congestion and the influence of generation or supply interests are generally greater than at distribution level. Moreover, legal and functional unbundling of distribution system operators was required, pursuant to Directive 2003/54/EC, only from 1 July 2007 and its effects on the internal market in electricity still need to be evaluated. The rules on legal and functional unbundling currently in place can lead to effective unbundling provided they are more clearly defined, properly implemented and closely monitored. To create a level playing field at retail level, the activities of distribution system operators should therefore be monitored so that they are prevented from taking advantage of their vertical integration as regards their competitive position on the market, in particular in relation to household and small non-household customers. ... (44) In the interests of security of supply, the balance between supply and demand in individual Member States should be monitored, and such monitoring should be followed by a report on the situation at Community level, taking account of interconnection capacity between areas. … The maintenance and construction of the necessary network infrastructure, including interconnection capacity and decentralised electricity generation, are important elements in ensuring a stable electricity supply.’