The exact percentage cannot be confirmed yet. However, in the live trial the amount of hydrogen blended with normal gas will not be above 20%.
Three steps must take place before the percentage can be confirmed:-
- Data collection
The Phase 1 laboratory testing and gas appliance safety checks in homes and buildings in the proposed trial area will provide information on the performance of appliances and the network with different percentages of hydrogen.
- Safety case application
The information collected in the testing and checks will be used as part of a safety case application to the HSE to deliver a blend of gas to homes in the trial area. A recommended percentage will be made in this application based on the data collected.
- Safety case approval
Before any hydrogen can be blended with normal gas in the Keele network, the percentage of hydrogen that will be delivered must be approved by the HSE. The HSE must be satisfied that the approved blended gas will be as safe to use as normal gas. Any approval will be given as an exemption to the Gas Safety (Management) Regulations. These regulations ensure the safe use and management of gas through the gas network in the UK.