I bought a Prius over the phone (and across the country, for that matter) by asking for "internet/fleet" sales.
I was told by the person who closed my deal that they do not work on commission. If true, their time has value and they are likely to either say "ok" or hang up
My call took all of two minutes.
Regarding the discount via the electric utility, you still might have a wide net if e.g. you are an Xcel customer. They cross multiple states.
And fwiw, I'm not even really sure that the dealership has to use the same electric utility as you. You may wish to ask Valerie.Kornahrens@nissan-usa.com