Dont worry, Seattle will soon raise residential taxes to close the gap with .31/kwh."For the Seattle chargers unveiled last month, users will pay 31 cents per kWh during peak daytime hours and 17 cents during off-peak hours. The utility will monitor use at its charging stations to see how effective the rates are at shifting charging to more favorable times. "
Wonder how that is going to fly in a city with something like 5¢/kWh electric rates? My guess is that most folks will charge at home. Maybe the tourists will pay those rates.
Much of what your wrote is beyond my understanding of the grid, but sounds like "devil in the details" stuff. I found this article after a quick Google search when I was wondering, as motivated by recent General Motors news, whether we could provide the electricity necessary to power a mostly EV country.My career is with an electric utility - distribution and I'm just shaking my head at this, we have issues when temps hit 90deg or a little higher after day 3, overloads, including transmission, dont know how EV's will work into this, or help the situation. To make things even more interesting, many different utilities submit infrastructure upgrades to the state leaders, many of these same leaders are influenced at a local level and these upgrades (mainly sub-transmission) are scrapped due to making decisions based on emotion (not in my back yard) and not by actual facts.
The other dis-advantage I see is the actual cost to upgrade individual residential services, we calculate load using a diversified calculation, meaning on a standard 200amp main service, is more or less figured to use 50amps at any given time, add EV charging and now the 4 homes served by a single 25kva xfmr needs at least a 50kva and larger secondary's to serve, larger xfmr's in the field mean more electric is actually wasted since there is resistance in the actual xfmr when not in use either, multiply that by 1.4 million (thats just my companies customer base) and you'll see what I'm talking about.
Also for a potential back feed with EV, the customer would be on the hook to install the proper ansi inverter that has automatic disconnecting means if grid power isnt sensed to reduce potential on a dangerous situation.
Also add smart metering and now the utility can add additional demand rates due to real time reporting, cut your power and is essentially in-control of many aspects of your life, do you really want that?