Exhibit 21.1
SUBSIDIARIES OF AMEREN CORPORATION AT DECEMBER 31, 2004 | ||
| Name | State or Jurisdiction 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. | 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. (40% 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 | |
| Peoria Medical Research Corp. | Illinois | |
| Illinois Power Company | Illinois | |
| IP Gas Supply Company | Illinois | |
| Illinois Power Transmission Company, LLC | Delaware | |
| Illinois Power Securitization Limited Liability Company | Delaware | |
| Illinois Power Special Purpose Trust | Delaware | |
| Illinois Power Financing I | Delaware | |
| Illinois Power Financing II | Delaware | |