The same as yours. Detect EV charge and, preferably, the model. The model has specifics as to the road degradation and can be tied to the cost.
EV charging needs to be separated from the standard home electricity usage and also smart charging solutions need to be available in the vehicle software so it can charge at the best possible tariff.
Those who have heavy vehicles which consume a lot of power and charge regularly should bear the larger chunk of the cost. Just as taxation on heavy fuel burners does today.
The point is not that personal EV charge units default to avoiding peak periods. The point is that the entire ecosystems should be priced and timed to consume the most available free power and the least peak power. This is not rocket science and simple software coding can do the job.
The black hole in finances is a different issue. It is hard to both encourage a move to EV and then penalise the EV owner for making the right climate choice. Until EV is the only choice, taxes and costs will have to lean towards the FF vehicles.
Remember, EV's are running at about 120mpge in Electric costs. Most Fossil burners average about 38mpg for petrol and 43mpg for diesel. My recently bought 2 year old 2l Citroen Euro 6 engine manages just under 47mpg but it is a 170bhp engine with 8 speed automatic transmission. Manual is slightly better and the 1.5l engine is even better (if less performance).
There is a LOT of scope for adjusting the balance of payments. Even then, Hybrid EV's which cost over £40k rrp (not dealer discounted), attract annual taxation cost for 5 of the first 6 years. With Hybrid EV's being generally more expensive than FF, this comes into play more than you would expect. One person who bought a BMW i.3 Hybrid would have chosen a different model if he had realised his options choices took him over £40k and attracted £2,400 of taxation over the next 6 years.
Right now EV's are exempt. But when it is only EV's? They are not going to be exempt are they?
Then EV's don't have regular servicing intervals. OK Tesla wants an annual check up, but others don't. Equally regenerative breaking reduces brake and tyre wear, there is no clutch, usually no geargbox, transmission is significantly more simple and vibrations from the "motor" minimal, causing less damage.
Plenty of scope to load on the taxes to balance things out post 2035. Given that the vehicles themselves are far cheaper to own and run than an initially cheaper FF vehicle.
Back to defaulting peak periods to OFF. This is not some WOW LOOK AT THIS EV'S ARE CRAP moment. It's simply common sense. Needless to say the press didn't recognise common sense and presented it as something else.
What can I say? If Covid reporting didn't enlighten as to how wholly inadequate and, basically, crap, our press is, far be it for me to enlighten with their EV reporting.