Exhibit 21.4



EXELON GENERATION COMPANY, LLC SUBSIDIARY LISTING



|                                                        |  |                                  |  |           
|------------------------------------------------------- |  | -------------------------------- |  | ----------
|SUBSIDIARY                                              |  | STATE OFINCORPORATION/ FORMATION |  | TRADE NAME
|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                           |  |           
|Boston Generating, LLC                                  |  | Delaware                         |  |           
|Braidwood 1 NQF, LLC                                    |  | Nevada                           |  |           
|Braidwood 2 NQF, LLC                                    |  | Nevada                           |  |           
|British Energy LP                                       |  | Delaware                         |  |           
|British Energy US Holdings, Inc.                        |  | Delaware                         |  |           
|British Energy US Investments, LLC                      |  | Delaware                         |  |           
|Byron 1 NQF, LLC                                        |  | Nevada                           |  |           
|Byron 2 NQF, LLC                                        |  | Nevada                           |  |           
|Cenesco Company, LLC                                    |  | Delaware                         |  |           
|Concomber, Ltd.                                         |  | Bermuda                          |  |           
|Dresden 1 NQF, LLC                                      |  | Nevada                           |  |           
|Dresden 2 NQF, LLC                                      |  | Nevada                           |  |           
|Dresden 3 NQF, LLC                                      |  | Nevada                           |  |           
|Exelon (Fossil) Holdings, Inc.                          |  | Delaware                         |  |           
|Exelon Allowance Management Company, LLC                |  | Delaware                         |  |           
|Exelon AOG Holding #1, Inc.                             |  | Delaware                         |  |           
|Exelon AOG Holding #2, Inc                              |  | Delaware                         |  |           
|Exelon Boston Services, LLC                             |  | Delaware                         |  |           
|Exelon Edgar, LLC                                       |  | 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 New England Power Services, Inc.                 |  | 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                         |  |           



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|                                         |  |                                  |  |                      
|---------------------------------------- |  | -------------------------------- |  | ---------------------
|SUBSIDIARY                               |  | STATE OFINCORPORATION/ FORMATION |  | TRADE NAME           
|Exelon Wyman, LLC                        |  | Delaware                         |  |                      
|EXRES SHC, Inc.                          |  | Delaware                         |  |                      
|ExTex LaPorte Limited Partnership        |  | Texas                            |  | Exelon Power Texas   
|ExTex Marketing, LLC                     |  | Delaware                         |  |                      
|ExTex Power, LP                          |  | Delaware                         |  |                      
|ExTex Retail Services Company, LLC       |  | Delaware                         |  | Exelon Power Services
|Fore River Development, LLC              |  | Delaware                         |  |                      
|La Salle 1 NQF, LLC                      |  | Nevada                           |  |                      
|La Salle 2 NQF, LLC                      |  | Nevada                           |  |                      
|Limerick 1 NQF, LLC                      |  | Nevada                           |  |                      
|Limerick 2 NQF, LLC                      |  | Nevada                           |  |                      
|Mystic I, LLC                            |  | Delaware                         |  | Mystic Generating    
|Mystic Development, LLC                  |  | Delaware                         |  |                      
|National Energy Development Inc.         |  | Delaware                         |  |                      
|Peach Bottom 1 NQF, LLC                  |  | Nevada                           |  |                      
|Peach Bottom 2 NQF, LLC                  |  | Nevada                           |  |                      
|Peach Bottom 3 NQF, LLC                  |  | Nevada                           |  |                      
|PECO Energy Power Company                |  | Pennsylvania                     |  |                      
|Penesco Company, LLC                     |  | Delaware                         |  |                      
|Port City Power, 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 Energies, Inc.                     |  | Delaware                         |  |                      
|Southeast Chicago Energy Project, LLC    |  | Delaware                         |  |                      
|Susquehanna Electric Company             |  | Maryland                         |  |                      
|Susquehanna Power Company                |  | Maryland                         |  |                      
|The Proprietors of the Susquehanna Canal |  | Maryland                         |  |                      
|Zion 1 NQF, LLC                          |  | Nevada                           |  |                      
|Zion 2 NQF, LLC                          |  | Nevada                           |  |