Based on this, it is in the process of developing the first city bond as an alternative financing mechanism for their projects. (blog.politics.ox.ac.uk)
Elon Musk is in a better position in that presently he can dilute issue shares of Tesla to finance matters, as well as buy 80 % of the Solar City bond issue. (alephblog.com)
Green city bonds tap into this on - going trend, and policy and (climatebonds.net)