Compressed Air Storage

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Taking example calculation at https://en.wikipedia.org/wiki/Compressed_air_energy_storage -

a 250 gallon propane tank stores 1 kWhr of energy when compressed to 200 PSI. Pressure rating of propane tanks is 215 PSI - [1]. Taking efficiency of an air engine - generator to be 50% - we have .5 kWhr. So a 500 gallon tank would get us 1kW hr of usable energy.

See comments below:

Links

  • EPRI head states that air will be cheaper per watt hr store than batteries. - [2]
  • Cost Comparison of Energy Storage - [3]
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