All of the VPS providers that I know of that say they are green are just buying carbon offsets. Some of them have solar panels on their datacenters but that barely makes up a tiny fraction of the power they use. I do not know of any datacenters that have hundreds of acres of solar panels and rooms of batteries and inverters to entirely power their fleet but I could be wrong. Dig deep if a company claims to use green energy unless you are including carbon offsets as an acceptable compromise.