Exhibit 21 SUBSIDIARIES OF CIPSCO AND CIPS State or Jurisdiction Name of Incorporation ____ _____________________ CIPSCO Incorporated Illinois Central Illinois Public Service Company Illinois Illinois Steam Inc. Illinois CIPS Energy Inc. Illinois Electric Energy, Inc.* Illinois CIPSCO Investment Company Illinois CIPSCO Securities Company Illinois CIPSCO Leasing Company Illinois CLC Aircraft Leasing Company Illinois CLC Leasing Company A Illinois CLC Leasing Company B Illinois CLC Leasing Company C Illinois CIPSCO Energy Company Illinois CEC-PGE-G Co. Illinois CEC-PGE-L Co. Illinois CEC-APL-G Co. Illinois CEC-APL-L Co. Illinois CEC-PSPL-G Co. Illinois CEC-PSPL-L Co. Illinois CEC-MPS-G Co. Illinois CEC-MPS-L Co. Illinois CEC-ACE-G Co. Illinois CEC-ACE-L Co. Illinois CIPSCO Venture Company Illinois * Central Illinois Public Service Company owns 20% of the common stock of EEI. -150-