Modern batteries with modern battery management systems are more durable than you think. Most things I've read expect a typical EV battery to retain usable capacity past the lifespan of the car itself, not to mention EVs typically have "hidden" capacity buffers against degradation.

I doubt any program would completely discharge a car, likely a program would involve a smart charger that would charge and discharge within a certain agreed upon window.

Look at the current residential demand response programs for an example. Details vary, but a quick search will show you a range of different programs.

Typically, utilities will announce incentive windows for peak periods ahead of time. Opt-in customers have thermostats that will respond to the peak program by reducing heat or cooling to an agreed upon temperature. The customer can override if they would like, but if they do they will lose the incentive.

Customers get a lower bill, utilities can save a lot shaving peak loads and avoid capacity problems.

For me, a personal vehicle is a depreciating asset that sits unused 98% of the time. I'd be better off with carshare if it existed in my city.

If the program also allowed me to use the battery as a home backup, I'd opt-in.

> those programs are going to become mandatory

I would say the jury is still out if it makes financial sence. Batteries lose capacity to aging even if you don't use them.

This is extremely speculative and if the government has appetite to make anything mandatory about cars, they would start by enforcing the speed limit electronically

Not at all.

The EVs' batteries are used as storage, which can help with intermittent electricity production but it implies two things assuming it can work at all:

1. enough electricity is produced overall,

2. the grid has the capacity to move all that electricity around.

These are the two issues I initially mentioned and using EVs' batteries as temporary storage solves neither.

https://electrek.co/2023/02/09/tesla-powerwall-owners-made-5...