Re: unlike your typical UK green energy project
New builds already are getting 40A and 50A incomers.
As far as I'm aware, in the UK the standard connection is still either 80A or 100A (230V 1ɸ) and indeed Western Power Distribution (and I'm sure others) are already trialling three phase to domestic premises precisely to account for electric boilers, heat pumps and electric cars.
M.