Solarpunk

They are not trying to power their home, but cut down on their utility bill over time, so it isn't stupid. That being said that a communal set of panels going to a central battery that you can pull off of and pay for excess power needed or a tenant sub wired array would be good, but their rental agreements would have to be changed by so much that it would literally take laws to make it work. Through their point of view is they are renting you the space and service some but not all, and sometimes none, of the features in the space. You literally own the flooring and the furniture and when you leave you take it with you or you sell it to the new tenant. So it is seen as roofing and walls/windows belong to the landlord and the rental agreements don't have rights to it and if they gave you rights to it you would have to rent the roof and return it to its prior state when you moved.