Each year, National Grid are paid a Transmission Network Use of System (TNUoS) fee in order to finance the cost of maintaining and updating the UK’s electricity grid.
This fee is split between generators and consumers of electricity. Customers receiving pass-through charges pay their share based on consumption during Triads. Triads occur when industrial demand coincides with the domestic tea-time period. However, with prior warning, you can reduce this charge – which often runs to tens of thousands of pounds – by reducing consumption when you know a Triad is going to occur.
The Triad Periods are the three half-hours in each winter season (November to February) that have the highest demand peaks on the electricity network. The three peaks have to be separated by ten days, so an extreme week-long cold snap can only dictate one of the three Triad Periods. The peaks tend to be in the half hour between 5 – 5.30pm. alfaenergy offers customers receiving pass-through charges a free Triad Warning Service. Warnings are also given a day ahead, rather than just a few hours, allowing you more time to prepare.