Cottonwood
Roadster#433, Model S#S37
General question: who is responsible for bringing the transformer on site? Utility (DTE)? Or Tesla?
Every installation that I have followed or seen has had the Utility Transformer installed by the local utility. It takes special training and qualification to deal with the 7-35 kV Distribution Voltages on primary side of those transformers. Those transformers are supplied by and owned by the utility.