@Milokino It is your choice if you want a smart meter or not, but it does not work by WiFi. The meters send data to SP by mobile phone signal, and send to the display by weak short range radio contact.
@Jonnel @whiteowl There are not enough smart meters yet to start time-linked tariffs, only about 25% are in place. BG and others have tried some experiments with lower tariffs at weekends and nights, but nobody has yet tried higher tariffs. These stick and carrot prices are a government plan to make better use of wind and solar and reduce the need for standby gas generation. The idea may well be put into practice mainly by off-peak tariff reductions. Nobody knows where this would leave fixed price contracts and Economy 7. We are looking at 2025 at least before anything happens on a significant scale. If there are carrots around it may well speed up the smart programme, which is unlikely to meet its target of being complete by the end of 2020. Household batteries would also speed up the use of off-peak tariffs, but the batteries are expensive and it needs companies to offer a rental scheme, perhaps that will be the next big change? Who knows? But these changes are not merely profiteering, they are all part of a plan for greener energy, electric vehicles, and better power management on a national level.