Exhibit 21 The seven registrants, Entergy Corporation, System Energy Resources, Inc., Entergy Arkansas, Inc., Entergy Gulf States, Inc., Entergy Louisiana, Inc., Entergy Mississippi, Inc., and Entergy New Orleans, Inc., are listed below: State or Other Jurisdiction of Incorporation Entergy Corporation Delaware System Energy Resources, Inc. (a) Arkansas Entergy Arkansas, Inc. (a) Arkansas Entergy Gulf States, Inc. (a) Texas Entergy Louisiana, Inc. (a) Louisiana Entergy Mississippi, Inc. (a) Mississippi Entergy New Orleans, Inc. (a) Louisiana _______________________ (a)Entergy Corporation owns all of the Common Stock of System Energy Resources, Inc., Entergy Arkansas Inc., Entergy Gulf States, Inc., Entergy Louisiana, Inc., Entergy Mississippi, Inc., Entergy New Orleans, Inc..