I have stumbled across this after meticulously going through my COJ bills from 2023 to present because a year ago we had a new meter installed and now have higher bills. Like OP, nothing warranting an extra 3kwh per day increase in consumption has changed in our house. In fact, we have installed smart switches on our geysers (which are solar but in winter need supplementation from electricity and before we used to leave them both on for the whole of winter) and we have not used electric heaters half as much as we have in previous years. Hoping @Vin has an update