EBASCO fought the constitutionality of the Public Utility Holding Company Act of 1935, losing a Supreme Court case in 1938, and was ordered dissolved under the provisions of that act in 1949. Mississippi Power and Light, Louisiana Power and Light, New Orleans Public Service and Arkansas Power and Light were deemed to be an integrated system, and were reorganized under the control of a new holding company, Middle South Utilities. It changed its name to Entergy in 1989, and merged/bought Gulf States Utilities, based in Beaumont, Texas, as of 12:00 midnight, January 1, 1994.