The maximum volume of hydrogen to be injected into the gas network as part of HyDeploy is 20%.
HyDeploy was and always will be focused on the role for hydrogen as a blend. The use of hydrogen in this way provides a deliverable pathway to carbon reductions now, without requiring consumer changes, and delivers practical developments which could enable a wider hydrogen future.
That is why HyDeploy does not include on-site testing of appliances or operation of the network on 100% hydrogen.
If the project has the opportunity to provide valuable data from off-site laboratory testing to inform other industry work on higher levels of hydrogen it will do so (e.g. Northern Gas Networks H21 project).