Thermal Energy Storage - Generation

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Basic Technology CharacteristicsSMW-Info-button.png


Image source: Caldwell Tanks

How it Works: Storing energy by heating or cooling a storage medium and converting to electricity.
  • Low cost incremental energy
  • Non-toxic materials
  • Can be integrated with existing power gen units
  • Low round trip efficiency 
  • System engineering challenges to enable low cost installations
Technology Variations:
  • Molten Salt, Liquid Air, Concrete/Gravel/Sand Thermal, Electro-Thermal Energy Storage
  • Used for bulk energy storage applications
AC RTE Efficiency: 35-60%
Cycle Life: 20 - 30 years
Technology Readiness Level (TRL): 4 to 9 - Varied
Installed Capacity: ~4 GW (mostly molten salt)