DMC-Orangeville
Audi eTron & John Deere 5100E
Looks like it isn't so much the ESA as the 2018 electrical code updates. ON electrical code - 2018 changes for vehicle charger load calcs
Your electrician should be able to provide this for you. If not, find another electrician.
I should have also mentioned.....
When a new code is released, there is a time frame for inspectors to promote the new code, and for organizations like CSA, UL and ESA to put on educational seminars for electricians, engineers etc. There is a delay of 12-18 months before each province enforces the code. If I recall correctly (I was at one of the CSA training sessions in March 2018), the target enforcement date for the new code, for ONTARIO was April/May 2019. I suspect this is the reason that @TechnoBabble has ESA insisting on the demonstrated load calculation, and others in the past have not.
Disclosure: I am not an electrician, but I was an industry insider.