The Solar Foundation funded by a SunShot grant has published a report on the costs of going solar. Installing solar energy systems on municipal or county property can deliver long-term cost savings for a local government. This report gives information to local government so that it can make informed decisions on whether solar installations will be a positive or negative net value. The main options for local governments is direct ownership or ownership by third parties. The report includes sections on estimated costs, project financing, third party ownership and avoided energy consumption costs, solar renewable energy credits and the financial tables simplifying these calculations.
The report can be found here