MacIntosh, Alabama, USA
This is the only other CAES plant in the world, and the only located in the USA. The plant was commissioned in 1991 and has an electrical power output of 110 MW. This plant offers an exceptional operating flexibility as all units can start within 10 minutes thus qualifying for spinning reserve. SSS Clutches at either side of the motor /generator allow changes between generation and storage modes without having to use separate shaft trains for the motor / compressor and the turbine generator.