The problem is more that the power grids were built under some assumption of average use per household. In germany, numbers of about 2kw/hour on average have be

The problem is more that the power grids were built under some assumption of average use per household. In germany, numbers of about 2kw/hour on average have been mentioned lately (two hair dryers). Adding significant sustained load to that upsets that calculation, and electric cars as well as switching to primarily electric heating (heat pumps) will require substantial investment into that infrastructure.