A firmware update is rolling out to customers with GM Energy's vehicle-to-home hardware, converting those systems into full vehicle-to-grid assets with no new hardware and turning home backup systems into grid resources when utilities need them.
And I see nothing about configuration capabilities being left for the vehicle owner once this is pushed out. In fact, I see nothing about benefits to owners at all in TFA.
Utility demand response is a contractual thing. Once you sign up, you are obliged to load shed at the utilities request. Or face penalties. V2G just goes a step further than unidirectional (V1G) flow control in that GM can just take power back. Note that it is GM on the other side of the deal. Not your local, regulated and answerable to state utilities commisioners, utilities.