There was almost a month earlier sell off before the market was informed of the French Government directive to sell energy at a lose to consumers.
There is, in several months, an upcoming Federal election in France. The energy discount to consumers is said to cost €8.8 billion to the company is in loses vs. Spot price.
Another way to think of the Price Action.
1- Early insiders sold of the stock before the rest of the market was made aware.
Another way to thing of the subsidy
2- The €8.8 billion in subsidies is money being used to support Macron's re-election campaign, which would be about 8x bigger than Clinton's entire campaign funding in 2016.