The goal of this activity, led by the company Gessal, is to research and determine the green hydrogen geological energy storage capacity in the peninsular subsoil, finally creating a tool to enable the study of potential sites and suitable geological structures (resources, feasibility, potential).

Petroleum Oil & Gas España will address the feasibility of green H2 storage on a pilot structure. A depleted natural gas field located in Aljarafe (Seville) will serve on a laboratory scale, to investigate the reactions of the mixture of gases (H2-CO2-CH4) and containing rocks. In addition to the feasibility of storing H2, the potential methanation that could occur in the subsoil due to the joint injection of green H2 and captured CO2 will be investigated. Finally, a 4D modeling of the pilot storage will be carried out.

Furthermore, the possibility of scaling the results obtained from this activity to the other depleted deposits with similar characteristics will be assessed.

Led by the company H2B2, the objective of the activity is to analyze the main technologies of the electrolytic process to produce H2 from the integration of different sources of renewable electricity generation and water qualities. The activity aims at the conceptual design of a new 20 MW electrolyser suitable for operating on large energy storages (geological type) and designed ad hoc to function under the operating parameters of renewable energy.

The goal for this activity, led by Técnicas Reunidas, is to research the possibilities of reconverting the gas installations of the pilot site for the use of hydrogen gas and the technical-economic optimization of the new necessary processes. Conceptual study and design validated in the laboratory according to an initial transition scenario in which mixtures of H2 (20%) and CH4 (80%) are managed, and a final scenario that will entail the specific design for the management of pure hydrogen gas (100 %).

The goal for this activity, led by Ayterra, will consist of evaluating the potential risks related to the storage of green hydrogen in the subsoil. Environmental, hydrogeological, geotechnical and geomorphological aspects will be addressed, including seismic hazard, taking into account the processes of electrolysis and gas transfer in surface installations (H2-CO2-CH4). It will include the design of an environmental monitoring network for a future operational phase.

Considering the potential for in situ methanation determined in the laboratory, the supply of CO2, the capacity to reduce emissions associated with pilot storage and the possible use of existing infrastructure will be evaluated.

The goal for this activity, led by Gas Natural Comercializadora, will consist of proposing an efficient integrated energy management system, combining renewable generation and seasonal storage of green H2. To this end, various technical-economic studies will be carried out against different scenarios of the energy system, pursuing the avoidance of discharges and the optimal use of the renewable resource, in which the degree of penetration of the renewable generation of the Integrated National Plan will be taken as a reference of Energy and Climate (PNIEC).

In addition, a Geographic Information System will be developed that will collect the seasonal storage capacity in the subsoil, as well as various relevant information on the energy system such as data on generation, demand, renewable resources, networks, etc.