On Sunday, 19 August 2018 07:36:34 UTC+1, Broadback wrote:
They are being advertised on TV as saving electricity. Now we all know
that adverts are all accurate and never lie. But how exactly do they
save electric? Or do they mean that customers can use the information
given to save it?

Their ultimate real purpose is energy demand management, in the new world of renewable energy.Tariffs will be instantly adjustable depending on electricity available.
https://en.wikipedia.org/wiki/Energy_demand_management