Hydrogen Blending in Natural Gas Pipelines

Surplus renewable energy can be converted to hydrogen by way of electrolysis. In some cases, injection of the resulting hydrogen as renewable gas into the natural gas pipeline system may result in increased social and environmental benefits at lower overall costs than delivering additional renewable energy as electricity. The result would be increased utilization of installed renewable generation capacity, such as wind or solar facilities. This article reviews key issues related to the option of injecting hydrogen into natural gas pipeline systems, including impact on end-use systems, safety, material durability and integrity management, leakage, and downstream extraction. Keywords: hydrogen; electrolysis; hydrogen blending; natural gas ; renewable hydrogen; pipelines; hydrogen storage