That's quite a big if. Okay, under the assumption that the energy industry is always honest and never games the system, we have true green energy.
I don't understand why people here try to explain very basic things that just don't work out in the real world as they would in a 9th grade math textbook.
Could you please -- by way of the principle of charity -- assume that readers here know what electricity is?
1) It does not help the German people if green energy is generated in Norway or someone puts up a solar panel in the Sahara if they get to breathe emissions from coal power plants.
2) Any overly complex scheme is likely to be gamed. Any German household can order "Öko-Strom". I don't believe for a second that enough real "Öko-Strom" is available to fulfil that demand in a legitimate manner.
I don't understand why people here try to explain very basic things that just don't work out in the real world as they would in a 9th grade math textbook.