Thermal energy is good solution for greenhouse gas problem and ever-growing future energy need. The problem with this renewable energy storage starting cost is high. In order to get financing from banks are difficult. Better way to solving this problem is government financial help or getting tax deduction from them. At the same time, conventional energy producers (greenhouse gas emitters) have to pay carbon tax. This would be balance the financial burden from renewable energy producers.
These underground storages have less greenhouse gas emission but first have to dig big hole. Those underground storage holes or space digger uses diesel or other fuel to dick the hole or tank storage space. Those fuels did not put to the calculation. These storage systems have only heat energy storage. This heat energy to electricity production is difficult job.
Usually these storage systems are connecting to heat pump. Heat pump works with electricity and those are not cheap. Also heat pumps are expensive and short life expectancy then the storage tank or borehole components. Heat pumps are high maintains costs than conventional system. The electricity used in the heat pump usually comes with high carbon footprint. These entire problems can be or could be solved in the future because of the technology is developing in these sector.
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