Indeed, that's a consequence of how the price is artificially calculated within the European electricity market. To avoid providing advantage to electricity resellers having providers with lower production costs the price is calculated according to the price of the last connected plant at any given time within the interconnected grid. It's most of the time natural gas or coal plants because of the "flexibility" needs.

The cost of electricity production in France is currently lower than Germany, but the resell price is currently close due to those market rules.