• Amal Chandar P T
• Hridai mallick
• Someswara rao dodda

The goal of reducing CO2 emissions to net zero in the coming decades by reducing traditional fossil fuel energy systems has been implemented in the industry for a long time. However, there has been a significant change in the solar and wind energy-driven economy system, which has turned out to be quite beneficial for humankind. Since this energy in the form of electricity cannot be stored on a large scale to balance the energy fluctuations, the need for storing hydrogen gas in Indian subsurface depleted reservoirs because of their immense storage volume will serve as an excellent opportunity. Underground storage has been proven to store a tremendous amount of energy after converting it into hydrogen. It has higher energy content per unit mass than other gases such as methane and natural gas, as the calorific value of hydrogen is roughly twice that of the conventional fossil fuels energy system. The overall efficiency of injecting and reproducing hydrogen for both homogenous and heterogeneous reservoirs will be analysed using numerical reservoir simulation to identify the displacement process. Storing hydrogen comes with more significant challenges, such as bacterial conversion in reservoirs and potential losses. These will be carried throughout the study and serve as a great alternative to a sustainable future. This paper reviews the feasibility and technical aspects of underground hydrogen storage, mainly depleted gas reservoirs, natural or artificial salt caverns, and saline aquifers. The purity of hydrogen produced, leakage from the reservoir, interactions with formations, formation fluids, microbes, microbe detection test, adverse effects and other challenges in storage will be briefly discussed.

Hydrogen storage

"A critical review on hydrogen storage and microbial activities in subsurface", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 5, page no.c801-c814, May-2022, Available :http://www.jetir.org/papers/JETIR2205405.pdf

"A critical review on hydrogen storage and microbial activities in subsurface", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 5, page no. ppc801-c814, May-2022, Available at : http://www.jetir.org/papers/JETIR2205405.pdf