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Exhibit 21.1 HANOVER COMPRESSOR COMPANY & SUBSIDIARIES
COMPANY LISTING AS OF 12/31/04 PLACE OFCOMPANY NAME
    
    INCORPORATION
    
    OWNERSHIP1
    
    
    Aurora (Barbados), SRL
    
    Barbados Corporation
    
    100% Wholly owned2
    
    
    Belleli Energy Djibouti F.Z.E.
    
    Djibouti Corporation
    
    99% Owned3
    
    
    Belleli Energy F.Z.E.
    
    United Arab Emirates Corporation
    
    100% Wholly owned4
    
    
    Belleli Energy S.P.A. (FKA Belleli Energy S.r.L.)
    
    Italian Corporation
    
    99.995% Owned5
    
    
    EI Venezuela Development Ltd.
    
    Cayman Islands Company
    
    100% Wholly owned6
    
    
    Energy Transfer-Hanover Ventures, L.P.
    
    Delaware Limited Partnership
    
    100% Wholly owned7
    
    
    Equity Leasing Corporation
    
    Oklahoma Corporation
    
    100% Wholly owned8
    
    
    Hanover Argentina S.A.
    
    Argentina Corporation
    
    100% Wholly owned9
    
    
    Hanover Asia, Inc.
    
    Delaware Corporation
    
    100% Wholly owned10
    
    
    Hanover Australia, L.L.C.
    
    Delaware Limited Liability Company
    
    100% Wholly owned11
    
    
    Hanover Bolivia Ltda.
    
    Bolivian Limitada
    
    100% Wholly owned12
    
    
    Hanover Brasil Ltda.
    
    Brazilian Limitada
    
    100% Wholly owned13
    
    
    Hanover Canada Corporation
    
    Alberta Corporation
    
    100% Wholly owned14
    
    
    Hanover Cayman Limited
    
    Cayman Islands Corporation
    
    100% Wholly owned15
    
    
    Hanover Colombia Leasing, LLC
    
    Delaware Limited Liability Company
    
    100% Wholly owned16
    
    
    Hanover Compressed Natural Gas Services, LLC
    
    Delaware Limited Liability Company
    
    100% Wholly owned17
    
    
    Hanover Compression General Holdings, LLC
    
    Delaware Limited Liability Company
    
    100% Wholly owned18
    
    
    Hanover Compression Limited Partnership
    
    Delaware Limited Partnership
    
    100% Wholly owned19
    
    
    Hanover Compressor Capital Trust
    
    Delaware Trust
    
    100% Wholly owned20
    
    
    Hanover Compressor Colombia Ltda.
    
    Colombian Limitada
    
    51% Owned21
    
    
    Hanover Compressor Company
    
    Delaware Corporation
    
    Parent22
    
    
    Hanover Compressor Holding Company NL B.V.
    
    Dutch Company
    
    100% Wholly owned23
    
    
    Hanover Compressor de Mexico, S. de R.L. de C.V.
    
    Mexican Corporation
    
    100% Wholly owned24
    
    
    Hanover Compressor Nigeria, Inc.
    
    Delaware Corporation
    
    100% Wholly owned25
    
    
    Hanover Compressor Peru S.A.C.
    
    Peruvian Company
    
    100% Wholly owned26
    
    
    Hanover Ecuador L.L.C.
    
    Delaware Limited Liability Company
    
    100% Wholly owned27
    
    
    Hanover (GB) Limited (f/k/a Hanover Maloney Limited)
    
    United Kingdom Company
    
    100% Wholly owned28
    
    
    Hanover General Energy Transfer, LLC
    
    Delaware Limited Liability Company
    
    100% Wholly owned29
    
    
    Hanover HL Holdings, LLC
    
    Delaware Limited Liability Company
    
    100% Wholly owned30
    
    
    Hanover HL, LLC
    
    Delaware Limited Liability Company
    
    100% Wholly owned31
    
    
    Hanover IDR, Inc.
    
    Delaware Corporation
    
    100% Wholly owned32
    
    
    Hanover International SA
    
    Switzerland Corporation
    
    100% Wholly owned33
    
    
    Hanover Limited Energy Transfer, LLC
    
    Delaware Limited Liability Company
    
    100% Wholly owned34
    
    
    Hanover (Malaysia) SDN BHD
    
    Malaysia Company
    
    60% Owned35
    
    
    Hanover Nigeria Energy Services Limited
    
    Nigerian Corporation
    
    100% Wholly owned36
    
    
    Hanover Partners Nigeria LLC
    
    Delaware Limited Liability Company
    
    100% Wholly owned37
    
    
    Hanover Peru Selva S.R.L.
    
    Peruvian Company
    
    100% Wholly owned38
    
    
    Hanover Services (GB) Ltd.
    
    United Kingdom Company
    
    100% Wholly owned39
    
    
    Hanover SPE, L.L.C.
    
    Delaware Limited Liability Company
    
    100% Wholly owned40
    
    
    Hanover Venezuela Ltd. (f/k/a Hanover/Enron Venezuela, Ltd.)
    
    Cayman Islands Company
    
    100% Wholly owned41
    
    
    Hanover/Trinidad, L.L.C.
    
    Delaware Limited Liability Company
    
    100% Wholly owned42
    
    
    Hanover Venezuela C.A.
    
    Venezuela Corporation
    
    100% Wholly owned43
    
    
    HC Cayman Ltd.
    
    Cayman Islands Company
    
    100% Wholly owned44
    
    
    HC Cayman LLC
    
    Delaware Limited Liability Company
    
    100% Wholly owned45
    
    
    H.C.C. Compressor de Venezuela, C.A.
    
    Venezuelan Corporation
    
    100% Wholly owned46
    
    
    HC Leasing, Inc.
    
    Delaware Corporation
    
    100% Wholly owned47
    
    
    HCC Holdings, Inc.
    
    Delaware Corporation
    
    100% Wholly owned48
    
    
    HCC Mantova S.r.l.
    
    Italian Corporation
    
    99.99% Owned49
    
    
    HCL Colombia, Inc.
    
    Delaware Corporation
    
    100% Wholly owned50
    
    
    HCM Compression, S. de R.L. de C.V.
    
    Mexican Corporation
    
    100% Wholly owned51
    
    
    KOG, Inc.
    
    Delaware Corporation
    
    100% Wholly owned52
    
    
    Maloney Industries (France) SA
    
    French Corporation
    
    100% Wholly owned53
    
    
    Nigerian Leasing, LLC
    
    Delaware Limited Liability Company
    
    100% Wholly owned54
    
    
    Production Operators Cayman Inc.
    
    Cayman Islands Corporation
    
    100% Wholly owned55
    
    
    Production Operators Cayman (Pigap II) Limited
    
    Cayman Islands Corporation
    
    100% Wholly owned56
    
    
    Production Operators Argentina S.A.
    
    Argentina Corporation
    
    100% Wholly owned57
    
    
    P.T. Hanover Indonesia
    
    Indonesian Corporation
    
    100% Wholly owned58
    
    
    Servi-Compresores, C.A.
    
    Venezuelan Corporation
    
    100% Wholly owned59
    
    
    Servicios Tipsa S.A.
    
    Argentina Corporation
    
    100% Wholly owned60
    
    
    Southwest Industries, Inc.
    
    Delaware Corporation
    
    100% Wholly owned61
    
    
    WilPro Energy Services (Guara) Limited
    
    Cayman Islands Limited Liability Company
    
    100% Wholly owned
 SUBSIDIARIES OF HANOVER COMPRESSOR COMPANY The following companies are subsidiaries of Hanover Compressor Corporation as of
December 31, 2004. Unless otherwise noted, a subsidiary is a company in which
Hanover Compressor Company or a subsidiary of Hanover Compressor Company holds
50% or more of the voting stock.