alexa Abstract | Green Energy Storage: The Potential Use of Compressed Liquid CO2 and Large Sub-Terrain Cavities to Help Maintain a Constant Electricity Supply

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One of the problems using most green energy sources is that there is not a constant supply. Therefore, there is a need for the development of energy storage and release systems. Many different technologies have been developed and employed for storage that among others includes:

1. Pumped hydro-power (potential energy),

2. Railway lines and carriages loaded with stones in hilly terrain (potential energy),

3. Thermal storage (thermo-dynamic energy),

4. Flywheels (kinetic energy),

5. Batteries (chemical energy),

6. Phase transition of salts (thermo-dynamics energy) and

7. Compressed air (thermo-dynamic energy)

Here I propose the potential use of CO2 and its phase-transition from gas to liquid in large sub-terrain cavities, such as disused mines, for electric energy storage and ground-heat extraction.

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Author(s): Dalgaard JZ*

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