Thank you, Sue.
Best answer by Transparent
Having more than one "cheap rate" was a feature which influenced the design of the SMETS meter system about 8 years ago. If you look at the menus on your gas and electricity smart meters, they have 4 or 5 different Time-Of-Use periods which can be configured by your Energy Supplier.
The preferred way forward is what the Government & Ofgem call Demand Side Response, whereby we have a variable tariff operating in chunks of 30-mins.
DSR is important because the SMETS2 meter incorporates a random delay to ensure that the grid doesn't have surges on the half-hours due to customers configuring devices to switch on at a precise time.
For that reason we urgently need to see Suppliers offering half-hour variable tariffs, and migrate customers away from fixed-time rates such as Economy-7.