Exhibit 21-4



Exelon Generation Company, LLC Subsidiary Listing



|                                                        |  |                         
|------------------------------------------------------- |  | ------------------------
|Affiliate                                               |  | Jurisdiction ofFormation
|AllEnergy Gas & Electric Marketing Company, LLC         |  | Delaware                
|AmerGen Clinton NQF, LLC                                |  | Nevada                  
|AmerGen Consolidation, LLC                              |  | Nevada                  
|AmerGen Energy Company, LLC                             |  | Delaware                
|AmerGen Oyster Creek NQF, LLC                           |  | Nevada                  
|AmerGen TMI NQF, LLC                                    |  | Nevada                  
|Braidwood 1 NQF, LLC                                    |  | Nevada                  
|Braidwood 2 NQF, LLC                                    |  | Nevada                  
|Byron 1 NQF, LLC                                        |  | Nevada                  
|Byron 2 NQF, LLC                                        |  | Nevada                  
|Cenesco Company, LLC                                    |  | Delaware                
|Concomber, Ltd.                                         |  | Bermuda                 
|Conemaugh Fuels, LLC                                    |  | Delaware                
|Dresden 1 NQF, LLC                                      |  | Nevada                  
|Dresden 2 NQF, LLC                                      |  | Nevada                  
|Dresden 3 NQF, LLC                                      |  | Nevada                  
|ENEH Services, LLC                                      |  | Delaware                
|Exelon Allowance Management Company, LLC                |  | Delaware                
|Exelon AOG Holding # 1, Inc.                            |  | Delaware                
|Exelon AOG Holding # 2, Inc.                            |  | Delaware                
|Exelon Edgar, LLC                                       |  | Delaware                
|Exelon Energy Company                                   |  | Delaware                
|Exelon Framingham Development, LLC                      |  | Delaware                
|Exelon Framingham, LLC                                  |  | Delaware                
|Exelon Generation Consolidation, LLC                    |  | Nevada                  
|Exelon Generation Finance Company, LLC                  |  | Delaware                
|Exelon Generation International, Inc.                   |  | Pennsylvania            
|Exelon Hamilton, LLC                                    |  | Delaware                
|Exelon New Boston, LLC                                  |  | Delaware                
|Exelon New England Development, LLC                     |  | Delaware                
|Exelon New England Holdings, LLC                        |  | Delaware                
|Exelon New England Power Marketing, Limited Partnership |  | Delaware                
|Exelon Peaker Development General, LLC                  |  | Delaware                
|Exelon Peaker Development Limited, LLC                  |  | Delaware                
|Exelon PowerLabs, LLC                                   |  | Pennsylvania            
|Exelon SHC, Inc.                                        |  | Delaware                
|Exelon West Medway Development, LLC                     |  | Delaware                
|Exelon West Medway Expansion, LLC                       |  | Delaware                
|Exelon West Medway, LLC                                 |  | Delaware                
|Exelon Wyman, LLC                                       |  | Delaware                
|ExTex LaPorte Limited Partnership                       |  | Texas                   
|ExTex Marketing, LLC                                    |  | Delaware                
|ExTex Power, LP                                         |  | Delaware                
|ExTex Retail Services Company, LLC                      |  | Delaware                
|Keystone Fuels, LLC                                     |  | Delaware                
|LaSalle 1 NQF, LLC                                      |  | Nevada                  



---

|                                                    |  |               
|--------------------------------------------------- |  | --------------
|LaSalle 2 NQF, LLC                                  |  | Nevada        
|Limerick 1 NQF, LLC                                 |  | Nevada        
|Limerick 2 NQF, LLC                                 |  | Nevada        
|North America Power Services, Inc.                  |  | Delaware      
|Nuclear US Holdings, Inc.                           |  | Delaware      
|Nuclear US Investments, LLC                         |  | Delaware      
|Nuclear, Limited Partnership                        |  | Delaware      
|PeachBottom 1 NQF, LLC                              |  | Nevada        
|PeachBottom 2 NQF, LLC                              |  | Nevada        
|PeachBottom 3 NQF, LLC                              |  | Nevada        
|PECO Energy Power Company                           |  | Pennsylvania  
|Penesco Company, LLC                                |  | Delaware      
|Quad Cities 1 NQF, LLC                              |  | Nevada        
|Quad Cities 2 NQF, LLC                              |  | Nevada        
|Salem 1 NQF, LLC                                    |  | Nevada        
|Salem 2 NQF, LLC                                    |  | Nevada        
|Sithe Latin American Holdings, Ltd.                 |  | Cayman Islands
|Sithe Overseas Power Services, Ltd.                 |  | Virgin Islands
|Sithe PARDO Holdings, Ltd.                          |  | Cayman Islands
|Sithe Tamuin Energy Services II, S. de R.L. de C.V. |  | Mexico        
|Sithe Tamuin Energy Services, S. de R.L. de C.V.    |  | Mexico        
|Sithe Tamuin Investments II, S. de R.L. de C.V.     |  | Mexico        
|Sithe Tamuin Investments, S. de R.L. de C.V.        |  | Mexico        
|Southeast Chicago Energy Project, LLC               |  | Delaware      
|Susquehanna Electric Company                        |  | Maryland      
|Susquehanna Power Company                           |  | Maryland      
|Tamuin Development Services, S. de R.L. de C.V.     |  | Mexico        
|Tamuin Energy Management Services II, Inc.          |  | Delaware      
|Tamuin Energy Management Services, Inc.             |  | Delaware      
|Tamuin Holdings A, LLC                              |  | Delaware      
|Tamuin Holdings II, LLC                             |  | Delaware      
|Tamuin Holdings III, LLC                            |  | Delaware      
|Tamuin Holdings, LLC                                |  | Delaware      
|Tamuin International Finance II, LLC                |  | Delaware      
|Tamuin International Finance, LLC                   |  | Delaware      
|Tamuin International, Inc.                          |  | Delaware      
|Tamuin Mexican Business Trust                       |  | Mexico        
|Tamuin Mexican Business Trust II                    |  | Mexico        
|TEG Holdings, LLC                                   |  | Delaware      
|Termoelectrica del Golfo, S. de RL. de C.V.         |  | Mexico        
|Termoelectrica Penoles, S. de R.L. de C.V.          |  | Mexico        
|Texas Ohio Gas, Inc.                                |  | Texas         
|The Proprietors of the Susquehanna Canal            |  | Maryland      
|Zion 1 NQF, LLC                                     |  | Nevada        
|Zion 2 NQF, LLC                                     |  | Nevada