Research and analysis

National Transmission System hydrogen blending: study

The project sets out analysis on the potential impacts of hydrogen blending in the national transmission system (NTS) at blend percentages of up to 2%, 5% and 20%.

• From: Department for Energy Security and Net Zero
• Published: 23 July 2025

Documents

National Transmission System hydrogen blending: study

PDF, 1.5 MB, 66 pages

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Details

The Department for Energy Security and Net Zero (DESNZ) commissioned Arup to conduct a technical survey of Original Equipment Manufacturers (OEMs) and existing gas end users connected to the National Transmission System (NTS) to assess:

• the extent of any safety, operability, performance and efficiency impacts and risks of accepting a variable blend of up to 2%, up to 5% and up to 20% hydrogen by volume
• whether any modifications to equipment or processes or mitigations (such as deblending) would be required and any associated costs of these
• the timeline for NTS end users to be operationally ready to accept variable blends
• technologies offered, any technical and operational challenges, research and development for hydrogen ready equipment and the support OEMs could provide to their customers in a transition to accepting a hydrogen blend

The outcomes of this survey are published here. This project helped inform the hydrogen blending consultation into the GB gas transmission network.

Published 23 July 2025