EX-21.1 11 ex21-1subsidiaries.txt SUBSIDIARIES OF AMEREN CORPORATION Exhibit 21.1 SUBSIDIARIES OF AMEREN CORPORATION AT DECEMBER 31, 2003 State or Jurisdiction Name of Incorporation -------------------------------- --------------------- Ameren Corporation Missouri Ameren Development Company Missouri Ameren Energy Communications, Inc. Missouri Ameren ERC, Inc. Missouri Missouri Central Railroad Company Delaware Gateway Energy Systems, L.C. Missouri Gateway Energy WGK Project, L.L.C. Missouri Ameren Energy, Inc. Missouri Ameren Energy Resources Company Illinois Ameren Energy Development Company Illinois Ameren Energy Generating Company Illinois Coffeen and Western Railroad Company Illinois Ameren Energy Fuels and Services Company Illinois Cowboy Railroad Development Co., L.L.C. Arkansas AFS Development Company, LLC Illinois Ameren Energy Marketing Company Illinois Illinois Materials Supply Co. Illinois AmerenEnergy Medina Valley Cogen, (No. 4) L.L.C. Illinois AmerenEnergy Medina Valley Operations, L.L.C. Illinois AmerenEnergy Medina Valley Cogen (No. 2) L.L.C. Illinois AmerenEnergy Medina Valley Cogen, L.L.C. Illinois Electric Energy, Inc. (20% interest) Illinois Ameren Services Company Central Illinois Public Service Company Illinois CIPS 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 CIPSCO Energy Company Illinois CEC-ACLP Co. Illinois CIPSCO Venture Company Illinois Union Electric Company Missouri Union Electric Development Corporation Missouri Electric Energy, Inc. (40% interest) Illinois CILCORP INC. Central Illinois Light Company Illinois CILCO Exploration and Development Co. Illinois AmerenEnergy Resources Generating Company Illinois CILCO Energy Corporation Illinois CILCORP Investment Management Inc. Illinois CIM Air Leasing Inc. Delaware CIM Energy Investments Inc. Illinois CIM Leasing Inc. Delaware CILCORP Lease Management Inc. Delaware CLM Inc., IV Delaware CLM Inc. - VII Delaware CLM Inc. - VIII Delaware CLM X, Inc. Delaware CLM Inc., VI Delaware CLM XI, Inc Delaware CLM XII, Inc. Delaware QST Enterprises Inc. Illinois QST Energy Inc. Illinois QST Energy Trading Inc. Illinois CILCORP Infraservices Inc. Illinois QST Inc. Illinois ESE Land Corporation Illinois Savannah Resources Corp. California ESE Placentia Development Corporation Illinois California/Nevada Development L.L.C. Delaware CILCORP Ventures Inc. Illinois CILCORP Energy Services Inc. Illinois Agricultural Research & Development Corp. Illinois