Energex is advertising to encourage us to use less power in peak periods so that they don't need to provide the infrastructure needed for the peak demand periods.
It has a catchy jingle, and scenes of a family arriving home after school/work, and the normal activities which take place then. Turning airconditioning up (24C), and lights off, disconnecting laptops from the power supply, one of them has just got out of the shower, then they assemble on the balcony for a barbeque.
They're jacking up the price of power to try and stop people from using it, many of the people who can least afford it will be the ones who suffer, the ones who are already careful using power because of their lower income... those people who tend not to be concerned about their power bills now don't give a rats because they can afford the increases.
I can't find the advertisement, but I can find this list of handy hints.