GWh Level Renewable Energy Storage and Supply using Liquid CO2

Easa I. Al-musleha, Dharik S. Mallapragadaa and Rakesh Agrawala,    aSchool of Chemical Engineering, Purdue Univeristy, West Lafayette, IN 47907, USA

Abstract

A novel energy storage system is proposed to deliver GWh or more of electric energy from an intermittently available energy source. The system is a closed loop cycle that transforms carbon atoms between liquid carbon dioxide and liquid methane. Methane is associated with the highest energy content per mole carbon. Therefore, for a given power, it requires the least amount of carbon circulation in the cycle. Both carbon dioxide and methane are stored as liquids, thereby avoiding the challenges associated with storing gases. ...

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