59In those circumstances, the Court considers that, on grounds of legal certainty and, in particular, the need to avoid serious negative consequences for undertakings whose restructuring or compliance with the Community acquis applicable to electricity production it was the contested regulation's aim to facilitate — such consequences resulting from the doubt cast on and discontinuity of that transitional derogation system provided for under the regulation to that end — the effects of that regulation must be maintained until such time as a new act has been adopted within a reasonable period on an appropriate legal basis, as a consequence of this judgment, without however prolonging those effects beyond 1 July 2007, the date on which that derogation system would have expired.
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