Image of Both Systems
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Advantages of KAB System

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) is not as steep as Li-ION.  Also, as determined by capacity of cavern, very long duration like 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 KAB system is 30 years without power degradation. In contrast, life of Li-Ion is 10 years in normal or common usage (much worse in heavy usage). For comparison, first GT-CAES in Alabama has continued operation for 30 years since installation and is still in operation at original capacity.

SAFETY

KOBELCO DRY SCREW is Oil Free type (only Air and Water is used) and no risk of ignition or explosion.  Meanwhile, several fire accidents have occurred at Li-ION sites recently.   

Comparison of Features
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KAB (A-CAES)

vs. Li-ION Batteries (Systems)