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Compressed air energy storage conventionally stores air in

  • A.a pressurised steel sphere at the plant
  • B.the void spaces of a spent coal seam at atmospheric pressure
  • C.an underground cavern
  • D.a network of surface pipelines

Answer: C

A solution-mined salt cavern gives the enormous volume needed at a cost no manufactured vessel could approach, which is why the technology is as site-limited as pumped hydro. Above-ground vessels suit only small schemes.

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