[mattuk89]

I'm on the "Agile Octopus" tariff in the UK and this is broadly how it works - the next days prices are available around 4pm the day before, giving you time to plan. There is also a cap of 35p/kWh (the standard fixed rate tariff is 15p/kWh for comparison) which limits the downside risk somewhat. In peak hours during the winter it regularly hits the cap. Bit of a halfway house between pure time of use and fixed tariffs.