....Currently I'm living in a student appartement with several units, where I don't have to pay any extra
The owner of the apartment is already kind enough not to charge you with electricity but I suggest that you shouldn't abuse it. As I look up on the internet, Germany is second in the highest electricity cost per household in EU
https://www.cleanenergywire.org/news/german-household-electricity-prices-second-highest-euI know there are also mining pools that you can join but I'm afraid I can't suggest you a name.