vs. Li-ION Batteries

Advantages of the KAB system

The cost for KAB system is competitive in longer durations over 4 hours. This is due to cost increase ratio of cavern storage (for duration hours) not being as steep as Li-ION. Also, as determined by capacity of cavern, very long durations of 24-48 hours is possible. Li-ION installations are typically 4 hours duration or less.

Cost Advantage in long duration
Longer Life of 30 years and no power degradation

Target life of the KAB system is 30 years without power degradation. In contrast, the life of Li-ION is 10 years in normal or common usage (much worse in heavy usage). For comparison, the first GT-CAES in Alabama has continued operation for 30 years since installation and is still in operation at original capacity.


KOBELCO DRY SCREW is Oil free type (only Air and Water is used) and there is no risk of ignition or explosion. Meanwhile, several fire accidents have occurred at Li-ION sites recently. In addition, KOBELCO has a nationwide service network in the USA and will minimize O&M risk for owners.

Comparison of Features


vs. Li-ION Batteries

Capital Cost comparison background
KAB Cost

KAB unit cost: $1,000/K W - $930/K W

  • Includes Dry Screw/Expander/Heat Exchanger/PCS (Power Conversion System) /Thermal Media Tanks/Cooling Towers/Others.

KAB BOP (balance of plant): $100/K W

CAVERN cost:

  • Base figures are quotes from COE report 2019.

  • Reasonable construction cost increase for longer duration.

  • Construction and Commissioning (C&C) for EPC: 25%.

Li-ION Cost

Transfer from figures in DOE report 2019:

Capital Cost (Energy Capacity): $271/KWh

Power Conversion System: $288/KW

Balance of Plant: $100/KW

Construction and Commissioning (C&C) for EPC $101/KWh

Costs shown are indicative only and subject to change.

Capital Cost comparison

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