+1
We went the Tarrif 33 AND the low power mode pump with our new pool and the power increase to our bills has been negligible.

Yes you could in theory use a power board to run your appliances BUT in the end you may get caught, especially with the new "smart" meters, that report back to home times and usages etc.
1 thing to keep in mind though is your chlorinator and what type of battery it uses. The Tarrif 33 is only available in certain time frames so you lose memory configurations and time. There are chlorinators that have good backup batteries and those that have bad battery backup and those that have no battery backup. There are manual devices to avert the problem but it does need some forethought and planning.
The other issue is there are lots of sparkies and pool people who are experts in name only when it comes to Tariffs and cashback offers so research carefully. Re the cashback it may still be available for switching to Tarrif 33 or putting in a low power pump. $250 was our payback from memory. We're with Ergon (Errr gone? yep powers out again).