Why build batteries that are single purpose?
1 million EVs with 80kWhr batteries equals 80 GigaWhr of energy storage. ( 941,176 85kWhr Model Sses )
That's only 1 hour of the 80GW that the article calls for.
Of course, if you had a million EVs, not all of them would be plugged in and ready to provide power, nor could an 80kWhr EV actually pump out 80kW via whatever it is likely to be plugged in to. 10-20kW is more likely.
10 million plugged in EVs would provide 80GigaWh for 10 hours, and each of them would only have to output 8kW.
But that would leave them empty, and the owners don't want that. The owners might set a limit of 20kWhr that they are willing to sell back.
Now you need 40 million EVs.
If 80% of your EVs are plugged in and participating in the grid ( charging when the wind is blowing + willing to sell back when it is not ) then you need 50 million EVs.
Guess what? We want 50 + million EVs on the road anyway.
Even if your EV doesn't participate by providing power, it sure could be useful by opportunistically charging when the wind is blowing.
If I plug my 85kWhr car in every night, use 15kW on average each day and tell it I want it to have at least 55kW every morning at 7AM, it has a full 2 day cycle to opportunistically use the wind power.
If the wind doesnt blow for 2 days - or I tell it I need it full tomorrow, it has to use the next best source it finds in the middle of the second night.