Gas distribution company SGN has been given approval by its regulator Ofgem to proceed to the next stage of its project to trial 100% H₂ gas through a 30-km decommissioned pipeline between Grangemouth and Granton, Scotland.

Repurposing Great Britain’s gas grid to H₂ could help decarbonize multiple sectors, including industry, transport and heat. Leading UK gas infrastructure firms are helping to build an evidence base for H₂ which will inform UK government heat policy decisions expected in 2026.

SGN’s £30-MM LTS Futures project is verifying the compatibility of Great Britain’s local transmission system (LTS) with H₂ gas. The company has been carrying out tests on the suitability of a decommissioned pipeline for a live H₂ repurposing trial. This pipeline is 30 km long and runs from the Grangemouth refinery to Granton on the outskirts of Edinburgh, Scotland.

Throughout the past year, a team of SGN engineers and researchers has carried out surveys and assessments to determine the integrity of the pipeline. The tests included an operation that involves pushing a pipeline inspection gauge (PIG) through the pipeline using compressed air to clean it and identify any critical defects. A hydrotest was also conducted, for which engineers filled the entire pipeline with water exceeding the pressure the pipeline will be exposed to during the live trial. The team has also inspected the condition of the pipeline above ground, below ground and at river crossings.

SGN submitted evidence gathered from the testing to Ofgem, which has confirmed the suitability of the pipeline for H₂ testing, giving the green light for the project to progress to the next stage.

Gemma Simpson, SGN Director of LTS Futures, said, “We’re delighted Ofgem has allowed us to continue to the second stage gate for this critical project which will be to connect the existing pipeline to a H₂ supply from our project partners, INEOS. Offsite trials will allow us to test procedures for making new connections to the pipeline. This includes the first ever live welding procedure on a H₂ pipeline.

“If we’re successful, we’ll be able to proceed to a live trial in 2024 that will deliver a blueprint for repurposing Great Britain’s LTS network, driving decarbonization and supporting our net zero goals. We believe H₂ has the potential to provide customers with a choice on how they heat their homes as part of a whole systems approach for decarbonizing heat.”