Octopus have offered various peak/off peak and even change by the hour tariffs for several years, IF you have a smart meter that can report back every 30 mins, its nothing new or groundbreaking (I used to be on a tariff that went into the minus when there was excess energy on the grid, excessive winds/storms usually the cause). The big 5/6 energy companies haven't really led the way on "smart" tariffs, instead happy to continue ripping off Joe Public for years.
Problem now is that there really isn't a off-peak period, its peak 24/7 due to the rates hitting the cap. Greg Jackson the CEO of Octopus keeps saying the wholesale energy market needs rebuilding from the ground up as its not fit for purpose. THAT does need a functioning government to sort. I don't see this current bunch of Donkeys doing anything about it.