The use of stored energy systems is receiving increased attention for power generation. Alabama Electric Co-operative (AEC) have installed a 110 MW Compressed Air Energy Storage (CAES) plant at McIntosh, Alabama. The plant employs tandem high and low-pressure fired expanders with the high-pressure combustors operating at 44 atm and the low-pressure units at 15 atm. Both are designed to operate with natural gas, or on No. 2 fuel oil, as a standby fuel. This paper describes the development of both the high and low-pressure combustors for this unique application, the testing of prototypes at simulated conditions at up to 8 atm using customized test rigs, and the definition of a design for application to the plant. Problems encountered during the first three years of operation are described and the solutions to overcome these are also presented.

1.
Korinek, K., Hendry, D., and Howard, J., “Alabama Electric Co-operative Compressed Air Energy Storage Project,” Power-Gen ’89, Vol. III, p. 489.
2.
Nakhamkin, M., Andersson, L., Swenson, E., Howard, J., Meyer, R., Schainker, R., Pollak, R., and Mehta, B., “AEC 110 MW CAES Plant Status of Project,” Proc. American Power Conference 53rd Annual Meeting, April/May 1991, p. 743.
3.
Totten, P. A., and Meyer, R., “CAES Old and New,” Power-Gen ’89, Vol. III, p. 495.
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