Yes the economics are interesting.
The high price spike events seen to be a lot more severe than the low price episodes.
Fill a 10 kWh battery in the morning for a cost of $0-$2 and then discharge in the evening for a sale of $4-$10+ and your ROI for a $15k battery is between 5-10 years and you help stabilize the grid.
Price spike events become revenue opportunities rather stressing about excess consumption.
Solaredge seems to have pretty good battery control in HA:
People are doing it with Powewall2 but send a bit more complex:
I have just ordered a powerwall mainly to see what it can do and to see if I can drive down that ROI period with automation. Delivery expected in April. Showed my installer what HA could do and he got very excited as he thinks he has a lot of users that could benefit.