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An investigating judge had charged that the energy firm hired a private firm, Kargus Consultants, to hack the computers of the former head of campaigns for Greenpeace France, Yannick Jadot, in 2006.
Greenpeace's anti-nuclear campaigning regularly targets EDF, which runs France's network of 58 electricity-producing nuclear reactors.
It spearheaded a years-long campaign to block the construction of France's new generation nuclear reactor in Flamanville on the north coast.