https://www.theverge.com/2022/3/8/22965919/gm-pge-ev-charging-grid-home-california
I've been waiting for this for years. I wonder now long until it becomes widely available. It dramatically increases the case for both an EV and a solar array and, I think, going off-grid for new construction in rural areas in particular.
I'm thinking of off-grid because the cost of running electric to a rural house can be huge. Just connecting to the grid can cost as much as a modest solar + storage setup and you still have to pay monthly connection fees and usage fees. With the car as your main battery, you can size up your array and size down your house/backup battery and possibly hit breakeven on Day 1 plus get free fuel for the car, so the savings start accruing immediately.
Obviously, the calculations are different for an existing house, a house with poor exposure and some other scenarios.