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Richard Dallaway's Blog

Octopus Cosy tariff rate names and colour coding

Our energy supplier has given confusing labels to the different rates they charge at different times of the day.

So that I can remember them, they are:

  • Green: “Day rate” — super expensive, avoid. Also called "peak rate" which makes more sense.
  • Light pink: “Off peak” — a standard rate. Sometimes also called "day rate", confusingly.
  • Dark pink: “Night rate” — from 13:00 - 16:00, 22:00 - 00:00, 04:00 - 07:00, cheapest rate, move energy usage to here. Also called "cosy rate" which is better, and "boost rate" in their T&Cs which is not better.

In the app it looks like this (annotated):

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Annotated screen grab from the Octopus Energy App, May 2025, Usage Tab, selecting “Day” for the time period.

In the above screen shot, note that the £ toggle is selected — you do not get the colour coding in kWh view:

Uploaded image
Screen grab from the kWh view of energy usage in the app.
heat-pump reference