In the context of the establishment and functioning of the internal market and with regard for the need to preserve and improve the environment, Union policy on energy shall aim, in a spirit of solidarity between Member States, to:

     (a) ensure the functioning of the energy market;
     (b) ensure security of energy supply in the Union;
     (c) promote energy efficiency and energy saving and the development of new and renewable forms of energy; and
     (d) promote the interconnection of energy networks.