Underground storage of hydrogen in porous media could be an option for storing large amounts of energy over time periods of days to months in order to dampen the fluctuating power generation from renewable sources like wind or solar power. In this study, possible dimensions of such a hydrogen storage, operating parameters as well as induced effects on the subsurface are investigated using numerical scenario simulations. The H2 storage is simulated using a heterogeneous sandstone layer in an anticlinal structure located in northern Germany. The parametrization of the storage formation is based on a local facies model. The simulated storage is capable of delivering about 200000 GJ of energy over a period of one week, a typical period of reduced wind power generation. The induced hydraulic effects of the storage do not show a strong dependence on the formation heterogeneity and are restricted to less than one bar overpressure for distances larger than 4.5 km. Chemical effects are limited to the zone taken up by the dissolved gas components in the formation water, which is approximated by the distribution of the gas phase. This zone strongly depends on formation heterogeneity and extents up to 3 km laterally.


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