[caf]

In at least WA, NSW, QLD and ACT you can go on time-of-use residential tariffs.

And driers (and washing machines - which use a considerable amount of energy particularly if they heat the water internally) typically already have timer-start functions.

[duncan_bayne]

Sure but time of use is _far_ less volatile than actual spot pricing. Hell, in WA and QLD it's not unknown for AEMO to post _negative_ energy prices.