Exhibit 21 SUBSIDIARIES OF DPL INC. DPL Inc. had the following wholly owned subsidiaries on March 30, 1998: Name State of Incorporation - ---- ---------------------- The Dayton Power and Light Company Ohio Miami Valley Insurance Company Vermont Miami Valley Leasing, Inc. Ohio Miami Valley Resources, Inc. Ohio Miami Valley Lighting, Inc. Ohio Miami Valley Development Company Ohio Miami Valley CTC, Inc. Ohio DPL Energy, Inc. Ohio