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Electricity transmission network spending is expected to rise nearly fourfold from ~£18bn across RIIO-ET2 (FY 2021-25) to ~£70bn across RIIO-ET3 (FY 2026-31). Transmission Network Use of System (TNUoS) revenue is expected to nearly double from ~£5.1bn in 2025-26 to ~£8.9bn in 2026-27, and forecasts are also rising for Distribution Use of System (DUoS) costs with RIIO-ED3 in April 2028.

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