1 EXHIBIT 21-3 Subsidiaries and Affiliates of DTE Energy and The Detroit Edison Company The Detroit Edison Company Midwest Energy Resources Company St. Clair Energy Corporation The Edison Illuminating Company of Detroit DTE Capital Corporation DTE Edison America, Inc. Edison Development Corporation EdVenture Capital Corp. Huron Energy Services, Inc. Syndeco Realty Corporation UTS Systems, Inc. DE Energy Services, Inc. Edison Energy Services, Inc. PCI Enterprises Company EES Coke Battery Company, Inc. DTE Coal Services, Inc. Biomass Energy Systems, Inc. Belleville Gas Producers, Inc. Alabama Energy Systems, Inc. DTE Arbor Gas Producers, Inc. ESCA Gas Producers, Inc. Plainville Gas Producers, Inc. RES Power, Inc. Winston Gas Producers, Inc. Orlando Gas Producers, Inc. FW Gas Producers, Inc. Sonoma Energy Systems, Inc. Riverview Gas Producers, Inc. Inactive subsidiaries and affiliates: DTE Center Point, Inc. Great Lakes Energy Products, Inc. Great Lakes Energy Services, Inc. Superior Energy Services, Inc. Wolverine Energy Services, Inc.