And I bet his hardware saturation is low too, making it an even worse use of resources compared to shared hosting in a data center that uses bin packing or live

And I bet his hardware saturation is low too, making it an even worse use of resources compared to shared hosting in a data center that uses bin packing or live migrating VMs or whatever. Because in the end you care about resources used for the actual work done, not the work capacity of the hardware. While it doesn't make much difference at this scale and it is a valid experiment to learn about solar power, it is telling of the general view about energy and environmental impact. People equate solar or wind or electric vehicles with green when the devil is always in the details.