I think i am missing something in this conversation but i am just curious as to why it matter if the cars are charged at night?
True solar energy is not being produced after sundown but that does not mean they stop working. Solar energy can be collected and simple solar backups would allow you to continue using that energy collected.
I use solar energy to charge my car overnight never been an issue whether the sun is out or not. I would think Disney and Anaheim has plans to eventually go away from coal or natural gas and not worry whether the sun is out or not
Or maybe i am just not following the conversation