Compressed Air Energy Storage (CAES)

Basic Technology Characteristics
How it Works:	Air is compressed (charging), stored, and expanded (discharging).
Benefits:	Mature bulk storage Low cost per kWh potential
Challenges:	Geographical limitations Requires fuel for heating producing CO2 emissions
Technology Variations:
Applications:	Bulk, long-duration services
AC RTE Efficiency:	40-55%
Cycle Life:	30 years
Technology Readiness Level (TRL):	9 - Fully Mature
Installed Capacity:	~500 MW