The cost of building and maintaining the high voltage British electricity transmission system is split between electricity generators and consumers. Transmission Network Use of System (TNUoS) charges are levied on electricity suppliers by National Grid in order to pay for their customers’ share of these costs.

TNUoS charges for half-hourly metered customers are based on their average electricity demand during the three Triad peaks. These are the three half-hours of peak system demand between November and February, with the second and third peaks separated from each other and the highest peak by a minimum of ten days. The tariff used by National Grid to determine the final TNUoS charge levied depends on the site’s location – for 2014/15, the tariff (as at October 2014) ranges from £16.17/kW in North Scotland, to £38.79/kW in Southern regions. TNUoS charges (or benefits, in the case of sites that export licence exempt electricity) are typically passed through to the customer by their supplier, either as an explicit charge, or as part of their energy rate.

Triads are based on peak consumption across the whole grid and are challenging to predict, due to the number of variables and associated uncertainties. Our market experts use a range of complex factors to predict when Triads are most likely to occur, enabling you to significantly reduce your energy transmission costs.

The Met Office recently used Market Insight to help them manage their Triads. Read about their story and success in their Triad Management Testimonial.