Some solar inverter systems already have a data connection to get live pricing information from the grid operator. It’s not that big of a problem to implement, although it definitely isn’t pervasive yet.

Minute by minute pricing is not crazy to expect and integration with HVAC, battery systems, and inverters isn’t crazy to expect to occur.

I think pulling for live pricing by inverters and appliances is not realistic on a grand scale. Using time of day pricing is much simpler imo.