So had another interesting chat with an electrician today. Apparently some ESA adjustments to code this year altered the load calculation to consider varying load during the day/night which might allow some of us to avoid an upgrade - you can install a device to monitor demand and throttle power to the charger if necessary - he talked about a "load shedder", code describes it as an "Electric Vehicle Energy Management Systems (EVEMS)". Has anyone had one of these devices as part of their install? The electrical code is paywalled but there's reference to these changes here and an excerpt below. Apologies if someone mentioned this already but it was news to me and very relevant as I am looking at a very pricey service upgrade. 2015 Code — EV supply equipment loads added to load calculations at 100% of rating 2018 Code — demand factors recognized where energy management system used. Electric vehicle supply equipment (EVSE) can draw a substantial load when in the charging mode. For existing buildings, the addition of EVSE can result in the total load exceeding the existing service capacity. In this case, the first option is to increase the service size. A second option is to install a system to monitor the power being drawn by EVSEs and other building loads, and control the EVSE loads such that the overall load does not exceed the limits of the existing service, feeders, and branch circuits. In combination with new Rule 8-500 and new Subrules 8-106(11) and (12) such systems are now recognized in the Code as Electric Vehicle Energy Management Systems (EVEMS). Complementary to the introduction of EVEMS, a new Table of loads and demand factors has been added specifically for EVSE.