Transmission Network Use of System (TNUoS) charges pay for the operation of the transmission network in Great Britain. The National Energy System Operator (NESO) collects them. TNUoS charges totalled £7.6bn in 2026/27, up 50% from 2025/26. The driver is RIIO-ET3, the new transmission price control that started in April 2026.

TNUoS charges for BESS in 2026/27: the locational signal is getting louder

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