Ahh, so the 30c rate is locked in for everyone? So they've basically price-shifted the elec so it follows production cost better?

Even if you're not home I'm thinking there are a number of ways to make use of the free elec. Hot water geyser seems like the obvious first candidate.

I'd also think heating (in winter), cooling in summer. Even if you're not there in those times, the effects will be evident for many hours after.

For those who have programmable washer/dryers or dishwashers it's also good. Even ovens on occasion.

I get that not everyone is best placed to take advantage of this, but equally improvements don't have to be an "everyone or no one" option.