I read your link and I don't see why you say originated. This is a French law. My understanding is that EDF wanted to take a stake in a German energy producer and to approve such a takeover the EU as the market authority required some type of market liberalization of the French energy market.
France chose to use the mechanism of ARENH. This isn't an EU thing.
France chose to use the mechanism of ARENH. This isn't an EU thing.