EXHIBIT 21

TXU CORP.

SUBSIDIARY HIERARCHY

Effective December 31, 2005



|                                                  |  |                                  
|------------------------------------------------- |  | ---------------------------------
|                                                  |  | State or Country of Incorporation
|TXU Corp.                                         |  | Texas                            
|TXU Australia (No. 2) Holdings Company            |  | Delaware                         
|TXU Asset Services Group Investment Company       |  | Delaware                         
|TXU Electric Delivery Company                     |  | Texas                            
|TXU Electric Delivery Transition Bond Company LLC |  | Delaware                         
|TXU US Holdings Investment Company LLC (1)        |  | Delaware                         
|TXU US Holdings Company                           |  | Texas                            
|TXU Fuel Company (2)                              |  | Texas                            
|TXU Energy Holdings Company                       |  | Texas                            
|TXU Energy Company LLC (3)                        |  | Delaware                         
|TXU Big Brown Management Company LLC              |  | Delaware                         
|TXU Big Brown Company LP                          |  | Texas                            
|TXU Big Brown Lignite Management Company LLC      |  | Delaware                         
|TXU Big Brown Lignite Company LP                  |  | Texas                            
|TXU DeCordova Management Company LLC              |  | Delaware                         
|TXU DeCordova Company LP                          |  | Texas                            
|TXU Tradinghouse Management Company LLC           |  | Delaware                         
|TXU Tradinghouse Company LP                       |  | Texas                            
|TXU Generation Management Company LLC             |  | Delaware                         
|TXU Generation Company LP                         |  | Texas                            
|Fuelco LLC (4)                                    |  | Delaware                         
|TXU Renewables Management Company LLC             |  | Delaware                         
|TXU Renewables Investment Company LLC             |  | Delaware                         
|TXU Renewables Company LP                         |  | Texas                            
|TXU Generation Services Company                   |  | Texas                            
|Oak Grove Management Company LLC                  |  | Delaware                         
|TXU Enterprise Holdings Company LLC               |  | Delaware                         
|TXU Collin Company LLC                            |  | Delaware                         
|TXU Valley Company LLC                            |  | Delaware                         
|TXU Energy Investment Company LLC                 |  | Delaware                         
|TXU Energy Finance Company LLC                    |  | Delaware                         
|TXU Mining Management Company LLC                 |  | Delaware                         
|TXU Mining Company LP                             |  | Texas                            
|TXU Big Brown Mining Management Company LLC       |  | Delaware                         
|TXU Big Brown Mining Company LP                   |  | Texas                            
|TXU SESCO Company LLC                             |  | Texas                            
|TXU SESCO Energy Services Company                 |  | Texas                            
|TXU Energy Retail Management Company LLC          |  | Delaware                         
|TXU Energy Retail Company LP                      |  | Texas                            
|TXU Portfolio Optimization Company LLC            |  | Delaware                         
|TXU Portfolio Management Company LP               |  | Texas                            
|TXU Energy Trading (California) Company           |  | Texas                            
|TXU Energy Trading Canada Limited                 |  | Canada                           
|TXU ET Services Company                           |  | Texas                            



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|                                                |  |                     
|----------------------------------------------- |  | --------------------
|TXU Energy Solutions Management Company LLC     |  | Delaware            
|TXU Energy Solutions Investment Company LLC     |  | Delaware            
|TXU Energy Solutions Company LP                 |  | Texas               
|TXU Chilled Water Solutions Company             |  | Texas               
|TXU SEM Company                                 |  | Delaware            
|Wichita/Victory Ave. LLC                        |  | Texas               
|TXU Industries Company LLC                      |  | Delaware            
|TXU Properties Company                          |  | Texas               
|TXU Development Company                         |  | Texas               
|EDC Four Inc. (5)                               |  | Delaware            
|National Pipeline Company                       |  | Texas               
|TXU Holdings Company                            |  | Delaware            
|Communications License Holdings I, Inc          |  | Texas               
|TXU Investment Company                          |  | Texas               
|Pinnacle One GP, LLC (6)                        |  | Delaware            
|Pinnacle One Partners, L.P. (7)                 |  | Delaware            
|Pinnacle I, Inc.                                |  | Delaware            
|Basic Resources Inc.                            |  | Texas               
|TXU Receivables Company                         |  | Delaware            
|TXU Finance (No. 2) Holdings Company            |  | Delaware            
|TXU Vermont Insurance Company                   |  | Vermont             
|TXU Business Services Company                   |  | Texas               
|TXU CG Management Company LLC                   |  | Texas               
|TXU CG Holdings Company LP                      |  | Texas               
|TXU Gas Management Company LLC                  |  | Texas               
|TXU Gas Investment Company LLC                  |  | Delaware            
|TXU Gas Company LP                              |  | Texas               
|TXU Processing Company                          |  | Delaware            
|Lone Star Energy Services, Inc.                 |  | Texas               
|Oncor Utility Solutions (Texas) Company         |  | Texas               
|Oncor Utility Solutions (North America) Company |  | Texas               
|ENS Holdings I, Inc.                            |  | Texas               
|ENS Holdings II, Inc.                           |  | Texas               
|ENS Holdings Limited Partnership (8)            |  | Texas               
|Enserch SACROC, Inc. (9)                        |  | Texas               
|ENSERCH E&C Holdings, Inc.                      |  | Nevada              
|Ebasco Services of Canada Limited               |  | Canada              
|ENSERCH E&C, Inc.                               |  | Nevada              
|Enserch Finance N.V.                            |  | Netherlands Antilles
|Enserch Finance (II), Inc.                      |  | Texas               
|Enserch House, Inc.                             |  | Texas               
|Enserch International Investments Limited       |  | Delaware            
|Humphreys & Glasgow Limited (L)                 |  | United Kingdom      
|Lavair Cogeneration Limited Partnership         |  | Delaware            

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|(1) | 100% ownership of Class B non-voting common stock of TXU US Holdings Company
|--- | ----------------------------------------------------------------------------



|(2) | 99.0% owned by TXU US Holdings Company, 1.0% owned by TXU Energy Holdings Company
|--- | ---------------------------------------------------------------------------------



|(3) | 99% owned by TXU US Holdings Company, 1% owned by TXU Energy Holdings Company
|--- | -----------------------------------------------------------------------------



|(4) | 92% membership interest owned by TXU Generation Company LP
|--- | ----------------------------------------------------------



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|(5) | 50% owned by TXU Development Company
|--- | ------------------------------------



|(6) | 90% owned by TXU Investment Company, 10% owned by TXU US Holdings Company
|--- | -------------------------------------------------------------------------



|(7) | 99.5% LP interest owned by TXU Investment Company, .5% GP interest owned by Pinnacle One GP, LLC
|--- | ------------------------------------------------------------------------------------------------



|(8) | 1% owned by ENS Holdings I, Inc., 99% owned by ENS Holdings II, Inc.
|--- | --------------------------------------------------------------------



|(9) | .035% owned by ENS Holdings Limited Partnership, 99.65% owned by Enserch Finance (II), Inc.
|--- | -------------------------------------------------------------------------------------------

Except as noted above, the voting stock of each subsidiary company and their subsidiaries and affiliates is wholly owned (100%) by its parent or a wholly-owned affiliate.

Affiliates



|                                |  |                                               
|------------------------------- |  | ----------------------------------------------
|                                |  | State or Countyof Incorporationor Organization
|ICMC Power Consortium, Inc. (1) |  | New York                                      
|EIP Holdings LLC (2)            |  | Delaware                                      

---

|(1) | 12.93% owned by TXU Development Company.
|--- | ----------------------------------------



|(2) | 20% ($2.5M) membership interest owned by TXU Energy Trading Company, 20% ($2.5M) membership interest owned by TXU Portfolio Management Company LP.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------



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