To add to what others already commented. The EU has been setting energy efficiency targets for itself for several decades now. In the most recent update to that target "EU countries will be required to achieve an average annual energy savings rate of 1.49% from 2024 to 2030" [0].

So it's not that surprising, that Germany's energy production is sinking, it is required to do so.

[0]: https://energy.ec.europa.eu/topics/energy-efficiency/energy-...