National Grid FutureGrid hydrogen test site: How a Cumbria pipeline is testing low-carbon gas blends for UK heating

National Grid is using a disused gas pipeline in Cumbria as a live test bed for hydrogen and natural gas blends. The FutureGrid project repurposes a section of the high-pressure National Transmission System to test how existing infrastructure handles hydrogen concentrations from low blends up to 100%. Engineers monitor pressure, leakage, and material stress to see if steel pipes and valves can withstand hydrogen without embrittlement. The facility is isolated from the public network and works with regulators to practice emergency procedures and leak detection. Data from FutureGrid helps model how a hydrogen-ready transmission system would behave day to day, including how fast operators can change gas blends and what upgrades compressors and valves need. For investors, the project sits in National Grid's regulated UK networks and could shape future returns by extending the life of gas assets in a low-carbon scenario.