> The issue is that most consumers don't like unpredictable prices.

The key is to not take this away; make it so that those who want predictability can get it (but they end pay more for the privilege) but those who want to try to "game the system" can (and incidentally help with the overproduction problem).

Done well, things like Powerwalls, thermal mass storage, etc could absorb quite a bit of load during peak production times, reducing load at inopportune times.