EXHIBIT 21 Subsidiaries of American Electric Power Company, Inc. As of January 1, 1997 Percentage of Voting Securities Location of Owned By Name of Company Incorporation Immediate Parent American Electric Power Service Corporation New York 100.0 AEP Communications, Inc. Ohio 100.0 AEP Communications, LLC Virginia 100.0 AEP Energy Services, Inc. Ohio 100.0 AEP Generating Company Ohio 100.0 AEP Investments, Inc. Ohio 100.0 AEP Resources Services Company Ohio 100.0 AEP Resources, Inc. Ohio 100.0 AEP Resources Australia Investment, Limited Cayman Islands 100.0 AEP Resources Australia Pty., Ltd. Australia 100.0 AEP Resources Australia Ventures, Inc. Delaware 100.0 AEP Resources Delaware, Inc. Delaware 100.0 AEP Resources International, Ltd. Cayman Islands 100.0 AEP Resources Mauritius Company Mauritius 99.0 (a) AEP Pushan Power, LDC Cayman Islands 99.0 (a) Nanyang General Light Electric Company, Ltd.People's Republic of China 70.0 (b) AEP Resources Limited Great Britain 100.0 AEP Resources Project Management Company, Ltd. Cayman Islands 100.0 AEP Pushan Power, LDC Cayman Islands 1.0 (a) Nanyang General Light Electric Company, Ltd.People's Republic of China 70.0 (b) AEP Resources Mauritius Company Mauritius 1.0 (a) AEP Resources Global Holland Holding B.V. The Netherlands 100.0 AEP Resources Global Holland Holding B.V. The Netherlands 100.0 AEP Resources Global Ventures B.V.n. The Netherlands 100.0 Australian Energy International Pty. Ltd. Australia 16.4 (a) AEI (Loy Yang) Pty. Ltd. Australia 100.0 Yorkshire Power Group Limited 50.0 (d) Yorkshire Holdings plc 100.0 Yorkshire Electricity Group plc 100.0 Yorkshire Power Finance Limited 100.0 Appalachian Power Company Virginia 98.6 (e) Cedar Coal Co. West Virginia 100.0 Central Appalachian Coal Company West Virginia 100.0 Central Coal Company West Virginia 50.0 (f) Central Operating Company West Virginia 50.0 (g) Southern Appalachian Coal Company West Virginia 100.0 West Virginia Power Company West Virginia 100.0 Columbus Southern Power Company Ohio 100.0 Colomet, Inc. Ohio 100.0 Conesville Coal Preparation Company Ohio 100.0 Simco Inc. Ohio 100.0 Franklin Real Estate Company Pennsylvania 100.0 Indiana Franklin Realty, Inc. Indiana 100.0 Indiana Michigan Power Company Indiana 100.0 Blackhawk Coal Company Utah 100.0 Price River Coal Company Indiana 100.0 Integrated Communications Systems, Inc. Georgia 13.1 (h) Kentucky Power Company Kentucky 100.0 Kingsport Power Company Virginia 100.0 Ohio Power Company Ohio 99.1 (i) Cardinal Operating Company Ohio 50.0 (j) Central Coal Company West Virginia 50.0 (f) Central Ohio Coal Company Ohio 100.0 Central Operating Company West Virginia 50.0 (g) Southern Ohio Coal Company West Virginia 100.0 Windsor Coal Company West Virginia 100.0 Ohio Valley Electric Corporation Ohio 44.2 (k) Indiana-Kentucky Electric Corporation Indiana 100.0 Wheeling Power Company West Virginia 100.0 (a) Owned 99% by AEP Resources International, Ltd. and 1% by AEP Resources Project Management Company, Ltd. (b) AEP Pushan Power LDC owns 70% and the remaining 30% is owned by two unaffiliated companies. (c) 13,499,500 shares of Common Stock, all owned by parent, have one vote each and 197,465 shares of Preferred Stock, all owned by public, have one vote each. (d) Owned 50% by AEP Resources, Inc. And 50% by a corporation not affiliated with American Electric Power. (e) Owned 50% by Appalachian Power Company and 50% by Ohio Power Company. (f) American Electric Power Company, Inc. owns 13.1% of the stock and the remaining 86.9% is owned by unaffiliated companies. (g) Effective as of 12/31/97, Central Operating Company has been dissolved. (h) American Electric Power Company, Inc. owns 13.1% of the stock and the remaining 86.9% is owned by unaffiliated companies. (i) 27,952,473 shares of Common Stock, all owned by parent, have one vote each and 257,921 shares of Preferred Stock, all owned by public, have one vote each. (j) Ohio Power Company owns 50% of the stock; the other 50% is owned by a corporation not affiliated with American Electric Power Company, Inc. (k) American Electric Power Company, Inc. and Columbus Southern Power Company own 39.9% and 4.3% of the stock, respectively, and the remaining 55.8% is owned by unaffiliated companies.