Ofgem issued guidance establishing the RIIO-GT3 (Revenue = Incentives + Innovation + Outputs - Gas Transmission) price control framework for gas transmission networks for the period 2026 to 2031. The guidance supplements the broader RIIO-3 network price control guidance and provides specific requirements for funded incremental obligated capacity.

Gas transmission network companies must use this guidance document alongside the main RIIO-3 guidance to ensure compliance with their licence conditions. Companies should review the funded incremental obligated capacity guidance document and submissions requirements to understand their obligations. Compliance with these conditions is required for continued operation as a licensed gas transmission network operator in Great Britain.