We have this in CA. I have Tesla batteries and they promote wanting me to enroll my batteries into a larger grid so their capacity can be used during higher load events.
I thought it was a novel idea when I heard about it.
California Virtual Power Plant, Tesla view: https://www.tesla.com/vpp/california
It is actually a pretty great way to address marginal demand spikes without overbuilding generation capacity. With the fringe bonus of local protection from short outages.
I wonder what the cycling does to battery lifetime?
Tesla Electric customers report making as much as $150 a day: https://electrek.co/2023/07/05/tesla-electric-customers-repo...