When my Octopus Agile energy price rises past x pence per kWh, make my Hue light(s) turn red. Set your own price threshold and which Hue lights to do this for. You can also change this to when the price falls below a value and optionally set after & before times so it only runs at certain times of day if you don't want to woken at 2.00am by the lights turning red, unless that's your thing.
Explore more great ways to automate Philips Hue and Agile Octopus