The main objective is to investigate for the optimal integration between renewable electricity generation and the natural gas network through the injection into the natural gas network of hydrogen generated by the PEM electrolyzer developed within the framework of 'GreenH2Pipes'.

To this end, the technical feasibility of direct injection of hydrogen into the natural gas network will be studied with the aim of achieving decarbonization objectives, and it could also be an efficient option for the storage and transportation of hydrogen.

To this end, the following specific objectives are proposed:

• Investigation using computational fluid dynamics (CFD) of the fluid dynamic behavior of different hydrogen injection conditions in the natural gas network
• Investigation of the mechanical behavior of materials from the Spanish natural gas transportation infrastructure, after exposure to mixtures of natural gas and hydrogen _.
• Preparation of hydrogen sampling procedures and impurity analysis associated with the injection of hydrogen into the natural gas network.

Investigation of the separation of natural gas and hydrogen mixtures transported through gas infrastructure. Research using a Bayesian scientific robot 'Bayesian machine scientists' of the optimal integration of hydrogen generated with renewable sources into the gas network.