The 28-nation EU's leaders pledged to move towards "an energy union with forward-looking climate policy" at their Brussels meeting.
They backed efforts to speed up the creation of a single European energy market, to develop infrastructure and diversify supply, according to a strategic agenda signed at their summit.
However, the meeting was overshadowed by the row over the appointment of Jean-Claude Juncker as the next president of the European Commission – a move strongly opposed by UK Prime Minister David Cameron.
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