TNUoS Charges 2026/27 Explained: Why UK Network Costs Are Rising
With TNUoS charges rising significantly for the 2026/27 period, navigating the increasing costs of the GB electricity network is becoming a major challenge for businesses. As residual tariffs, driven by the Targeted Charging Review (TCR), see an average increase of over 62%, finding ways to mitigate these fixed network costs is critical.
In this video, we explore the impact of these rising Transmission Network Use of System (TNUoS) charges and how sites can minimise their network fees. We look at why the residual tariff makes up over 90% of these charges and how the Ofgem TCR aims to recover sunk network costs. You will learn how different sites are assigned to residual bands based on their connection type and what this means for your future energy bills as fixed charges replace demand driven costs.
We also demonstrate how you can test these dynamics and potential solutions in Gridcog. Using a London based shopping centre as a baseline, we compare cashflows between the 2025/26 and 2026/27 tariff periods. We model the financial impact of shifting from a High Voltage 3 (HV3) TNUoS tariff band to a lower HV2 band by limiting the grid connection and integrating an autosized battery system. Watch how the platform analyses the initial capital outlay against long term savings, helping you determine the most profitable setup and improve your project NPV.
💡 Gridcog's platform enables advanced modelling of energy assets and complex network tariffs, supporting smarter investment decisions, maximised revenue, and highly calibrated market participation.
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