Nah, you can buy a filter in Germany that goes between your wall socket and appliance. The device makes sure that only "good" electricity (ie. the kind that was generated by your preferred source) powers your appliances.
I wish I was kidding.
Got a link? I'm not sure how this would even work, but if you aren't kidding, I'm curious to read the marketing.
Obviously, it does not work. It's just a box with some LEDs. It only has one purpose - to part fools and their money.
I had to switch my google results to German and search for "anti-akw-strom adapter" (AKW - atomkraftwerke).