Although a large chunk of that $1K per year is the RUC exemption....which will end at some time (while probably not in 2021, in the long term someone has to pay for the NLTF)
You are clearly talking about VERY low km per year driving. To only save $1K per year WITH RUC exemption would put the driving at well under 10,000kms. I'm saving about $2,500 per year with RUC exemption (between fuel savings and the service & maintenance savings), how much I save after the exemption ends would depend on how much they decide to charge, maybe it will drop to $1,800 per year but it could be a bit more or a bit less. I'm running somewhere around 16,000 km per year.
Different people will have a different idea of what is 'low km'. I personally do 9,000km per year and my back of an envelope calculation shows me hypothetically saving about $500 per year on energy. That takes into account a certain % of charging being done on public stations which incur a per minute fee as well as a per kwh fee.