Exhibit 21 WESTERN RESOURCES, INC. Subsidiaries of the Registrant State of Date Subsidiary Incorporation Incorporated 1) Kansas Gas and Electric Company Kansas October 9, 1990 2) Mid Continent Market Center, Inc. Kansas December 13, 1994 3) Westar Energy, Inc. Kansas April 14, 1995 4) Westar Security, Inc. Kansas April 14, 1995 5) Westar Capital, Inc. Kansas October 8, 1990 6) The Wing Group Limited Co. Delaware February 21, 1996