I am building a net zero house in Edmonton Canada, which will not have a gas service to it. It will have a 13kW solar array and I want to pre-wire it to support two future EVs. Sadly this new neighbourhood only has 100A services to their lots. There will be an electric heat pump, with auxiliary heating unit for our winters, forced air electric hot water tank, HRV, electric stove and electric washer/dryer. I will purchase a Model 3 or a Model Y, and my spouse will either have a PHEV or EV as well. I know we need to upgrade the main service to the lot, which so far quotes are around 15-20K directly from the power corporation. This includes trenching, ripping up sidewalk, materials and upgrading the transformer. My question is will 200A be enough? Also how best to do it, so far the idea was to just run individual lines from the breaker panel in the basement to the garage for the circuits, one on each side of the garage. Another option would be to do a sub-panel in the garage. The garage is an attached one as well. Thanks for your replies!