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Exhibit 21.1
 SUBSIDIARIES OF AMEREN CORPORATION
AT DECEMBER 31, 2006
 State or JurisdictionName
    
    of IncorporationAmeren Corporation
    
    MissouriAmeren Development Company
    
    MissouriAmeren Energy Communications, Inc.
    
    MissouriAmeren ERC, Inc.
    
    MissouriMissouri Central Railroad Company
    
    DelawareGateway Energy Systems, L.C.
    
    MissouriGateway Energy WGK Project, L.L.C.
    
    MissouriAmeren Energy, Inc.
    
    MissouriAmeren Energy Resources Company
    
    IllinoisAmeren Energy Development Company
    
    IllinoisAmeren Energy Generating Company
    
    IllinoisCoffeen and Western Railroad Company
    
    IllinoisAmeren Energy Marketing Company
    
    IllinoisIllinois Materials Supply Co.
    
    IllinoisElectric Energy, Inc. (40% interest)
    
    IllinoisMidwest Electric Power Inc.
    
    IllinoisJoppa and Eastern Railroad Company
    
    IllinoisMet South, Inc.
    
    IllinoisMassac Enterprises LLC
    
    IllinoisJoppa Generating Station LLC
    
    IllinoisAmerenEnergy Medina Valley Cogen, (No. 4) L.L.C.
    
    IllinoisAmerenEnergy Medina Valley Operations, L.L.C.
    
    IllinoisAmerenEnergy Medina Valley Cogen (No. 2) L.L.C.
    
    IllinoisAmerenEnergy Medina Valley Cogen, L.L.C.
    
    IllinoisAmeren Energy Fuels and Services Company
    
    IllinoisCowboy Railroad Development Co.
    
    ArkansasAFS Development Company, LLC
    
    IllinoisGateway Terminal LLC
    
    MissouriCILCORP Lease Management LLC
    
    DelawareAmeren Illinois Transmission Company
    
    IllinoisAmeren Services Company
    
    MissouriCentral Illinois Public Service Company
    
    IllinoisCIPS Energy Inc.
    
    IllinoisCIPSCO Investment Company
    
    IllinoisCIPSCO Securities Company
    
    IllinoisCIPSCO Leasing Company
    
    IllinoisCLC Aircraft Leasing Company
    
    IllinoisCLC Leasing Company A
    
    Illinois




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State or JurisdictionName
    
    of IncorporationCIPSCO Energy Company
    
    IllinoisCEC-ACLP Co.
    
    IllinoisCIPSCO Ventures Company
    
    IllinoisCILCORP INC.
    
    IllinoisCentral Illinois Light Company
    
    IllinoisCILCO Exploration and Development Co.
    
    IllinoisAmerenEnergy Resources Generating Company
    
    IllinoisCILCO Energy Corporation
    
    IllinoisCIM Energy Investments Inc.
    
    IllinoisQST Enterprises Inc.
    
    IllinoisQST Energy Inc.
    
    IllinoisQST Energy Trading Inc.
    
    IllinoisCILCORP Infraservices Inc.
    
    IllinoisQST Inc.
    
    IllinoisESE Land Corporation
    
    IllinoisSavannah Resources Corp.
    
    CaliforniaESE Placentia Development Corporation
    
    IllinoisCalifornia/Nevada Development L.L.C.
    
    DelawareCILCORP Ventures Inc.
    
    IllinoisCILCORP Energy Services Inc.
    
    IllinoisAgricultural Research & Development Corp.
    
    IllinoisEnergy Risk Assurance Company
    
    VermontIllinois Power Company
    
    IllinoisIP Gas Supply Company
    
    IllinoisIllinois Power Transmission Company, LLC
    
    DelawareIllinois Power Securitization Limited Liability Company
    
    DelawareIllinois Power Special Purpose Trust
    
    DelawareIllinois Power Financing I
    
    DelawareIllinois Power Financing II
    
    DelawareUnion Electric Company
    
    MissouriUnion Electric Development Corporation
    
    MissouriElectric Energy, Inc. (40% interest)
    
    IllinoisMidwest Electric Power Inc.
    
    IllinoisJoppa and Eastern Railroad Company
    
    IllinoisMet South, Inc.
    
    IllinoisMassac Enterprises LLC
    
    IllinoisJoppa Generating Station LLC
    
    IllinoisFuelco LLC
    
    Delaware