And the distribution and transmission prices are usually fixed. But I think they should float with supply and demand too: the drivers of upgrades and failures are the peak-time users of capacity.
That’s what we do with data, don’t know why we don’t do it with electrons.
Why yes, my intelligent electricity agent would like my dryer to book 2 kWh at 4AM-5AM with a 4cent penalty to me if you cancel.
Most of my loads are thermal, and I have lots of thermal banking available. If electricity prices are negative, run my A/C full tilt.