52It should be added that the nature of electricity is such that, once it has been allowed into the transmission or distribution system, it is difficult to determine its origin and in particular the source of energy from which it was produced (judgment of 1 July 2014, Ålands Vindkraft, C‑573/12, EU:C:2014:2037, paragraph 87). Similarly, when the transmission grid operator dispatches an electricity generating installation which uses both renewable and conventional energy sources, it is equally difficult to identify specifically the proportion of the electricity produced by that installation from renewable energy sources. Those technical circumstances entail a certain amount of uncertainty, with the result that it cannot be ruled out that part of the electricity declared to have been produced from renewable energy sources was not entirely so at that precise time.
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