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4 December 2025

National Gas receives its final determination for RIIO-GT3 from Ofgem

National Gas receives its final determination for RIIO-GT3 from Ofgem

On Thursday 4th December, National Gas received its final determination for RIIO-GT3 (2026-2031) from Ofgem. The final determination sets out the investment and outcomes we will deliver through to March 2031.

Our plan, shaped by customers and stakeholders, aligns with Ofgem and the Government’s ambition to deliver a secure, resilient gas transmission infrastructure that supports a low-cost transition to a clean energy system. 

Our initial assessment indicates that Ofgem has allowed a baseline funding level of £3.2 billion, following a draft determination of £2.46 billion, with scope for significant further allowances to be granted within the regulatory period.

Jon Butterworth, Chief Executive Officer, said:

“This funding outcome confirms the critical role that the gas transmission system plays in Britain’s energy security now and for decades to come. For just 3p per day, less than 0.5% of the average consumer dual-fuel bill, Britain’s national gas transmission system continues to deliver excellent value for money for consumers – keeping our lights on, industries powered and homes warm.

“Over the past few months, our teams have worked extensively and constructively with Ofgem to provide additional evidence on the case for further investment in Britain’s national gas network to safeguard our country’s energy security and deliver benefits for consumers.

“In the coming weeks, we will undertake a more detailed review of Ofgem’s decision to ensure it enables us to deliver a safe, resilient network that secures Britain’s energy, maintains our industrial competitiveness and supports the country’s clean energy ambitions.”

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