> The original statement was - BEVs will overload the grid, this discussion shows oposite is the case - they are used to stabilise the grid.

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.