Exhibit 21-1 SUBSIDIARIES OF DTE ENERGY COMPANY DTE Energy Company's principal subsidiaries as of December 31, 2005 are listed below. All other subsidiaries, if considered in the aggregate as a single subsidiary, would not constitute a significant subsidiary. Subsidiary State of Incorporation - ---------- ---------------------- 1. The Detroit Edison Company Michigan 2. DTE Enterprises, Inc. Michigan 3. DTE Energy Resources, Inc. Michigan 4. Michigan Consolidated Gas Company Michigan