The Tone Frequency signal is ending
Do you have an electric boiler? Or do you use electricity at normal and off-peak rates and do you not yet have a smart meter? If so, you are making use of the 'Toon Frequent' signal (Ripple Control signal). This signal tells your meter and/or boiler when the electricity consumption at the day or night tariff starts and stops. The TF signal is being phased out by the grid operators between 1 July 2021 and 31 December 2022. This page provides more information about what that means for you.