Edwin, you are correct on only one point. The $.015 is a typo. It should read $.15. So, yes it's about 15 cents per kWh to charge at home. 
With that said, the rest of your comments only prove my point.
Why would the city design their system with only plug-in hybrids in mind as you claim? That is truly virtually worthless and penny-wise and pound foolish. A more robust system designed to meet the needs of modern EVs would cover plug-in hybrids too and would not have cost much more to put into place. Your plug-in is a bad comparison here since it does not represent the needs of modern EV owners.
Yes, electricity does cost too much in WA state because we never hold power companies like PSE accountable. PSE also generates most of its power using fossil fuels with up to a 50% transmission loss on their antiquated, non-smart, grid.
So the city should NOT charge more than the average home costs to charge at. After all, the citizens pay for the chargers and infrastructure at the Parks. The COB should charge the lowest rate possible. Say $.18 to $.20 cents per kWh. This modest increase should cover maintenance while making the chargers attractive to use, except for the fact that they’re too slow..
The main argument in my article, that you ignore in your comment, is charge time. Yes, the charge time is affected by how anemic the COBs chargers are for modern EVs. Your hybrid, is again, a bad comparison. Why design a system for a transitional technology when EV numbers and demands are only expected to increase? It truly is a half-assed way to design infrastructure. The COB simply never does it right.