Free electricity. How can I take advantage?

Question: My dad owns a small hydroelectric power station in Central Europe. I have been helping my dad maintain it and last time we went there I noticed that there were power outlets and he said that this is his own produced energy and therefore basically for free. Now I’m thinking about mining crypto there.

What do you think about this idea? What miner should i buy? Do you have any other idea on how i could profit from this?

Note: I’m pretty sure there isn’t an internet cable that i could connect to but my phone has internet.

I would be very thankful for all of your answers! Greetings