Renewable energy sources are indisputably central to environmental sustainability, which is of the greatest importance to NAFTA. This is why we became a partner of the Underground Sun Storage project, created in accordance with the Power to Gas concept.
Underground Sun Storage is a unique project to verify the possibility of storing energy from renewables in underground geological structures in the form of a natural gas and hydrogen mixture. If the technology tests are successful, the project could become one of the future possibilities for storing the large surpluses of energy from renewable sources. Such energy can currently only be stored to a limited extent and therefore often remains unused. A solution to this problem would increase the attractiveness of renewable energy systems, allow them to grow further and ultimately result in a significant reduction in global CO2 emissions.
Thanks to its extensive experience with underground storage facilities, NAFTA is also a partner in reactive transport modelling, the analysis of the impact on subsurface completion, the development of the technical proposal and supplying the compressor for the test bed facility.
The project consists of various phases which different partners are involved in. Tests will be undertaken on the influence of the hydrogen admixture on the reservoir rock, on the corrosion of steel components typically used in the storage facility and the behaviour of the mixture under static and dynamic reservoir conditions
Testing includes laboratory tests, simulations and in-situ experiments. The project documentation also comprises a risk assessment, a life-cycle analysis and an evaluation of the legal and economic conditions. The expected culmination of the project will be the initial pilot injection and the withdrawal of the natural gas and hydrogen mixture under actual reservoir conditions. The initial injection into the Underground Sun Storage is planned for 2015.
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