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

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.