My father has a small house in southern Spain. There's no grid so we put loads of solar panels (8kW). In summer, there's plenty of energy. I have installed 3 s

My father has a small house in southern Spain. There's no grid so we put loads of solar panels (8kW). In summer, there's plenty of energy. I have installed 3 servers (a "normal" tower PC + graphic card) running Boinc. A small timer powers on the PCs at 10, and powers them off at ~17h. Once up, they start folding and calculating for Folding@Home or WorldCommunityGrid. I don't earn any money from it, but I like the fact that I'm contributing to science