Our grid already feeds 2-3kW to pretty much every parking spot because of block heaters needed to get ICE vehicles running in the winter. The grid needs exactly zero changes for an EV future. A few last-mile upgrades maybe, but nothing major. This is according to the government organisation that handles the grid infrastructure.

As for "hydrogen network", we have pretty much zero infrastructure bringing natural gas or any kind of gas to residential homes. I think the capital city used to have a gas pipeline, but it got dismantled and people just use portable CNG tanks.