Exhibit 21 EQUITABLE RESOURCES, INC. Subsidiaries of the Registrant December 31, 1993 Percentage of Voting State of Securities Name of Subsidiary Incorporation Owned by Immediate Parent Company Equitable Resources, Inc. (also d/b/a Equitable Gas Company) Pennsylvania EQT Capital Corporation Delaware 100 Equitable Gas-Energy Company Pennsylvania 100 Kentucky West Virginia Gas Company West Virginia 100 Equitrans, Inc. Delaware 100 ET Storage Company Pennsylvania 100 Nora Transmission Company Delaware 100 EREC Capital Corporation Delaware 100 Equitable Resources Energy Company West Virginia 100 Equitable Resources Marketing Company Delaware 100 Equitable Storage Company Delaware 100 Equitable Pipeline Company Delaware 100 Louisiana Intrastate Gas Company LLC Delaware 100 LIG, Inc. Delaware 100 LIG Liquids Company LLC Delaware 100 LIG Chemical Company Louisiana 100 Tuscaloosa Pipeline Company Louisiana 100 Equitable Resources (Canada) Limited Alberta, Canada 100 Hershey Oil Corporation California 100 Andex Energy, Inc. Delaware 100 ERI Realty, Inc. Pennsylvania 100 Equitable Argentina Note: All subsidiaries are included in the consolidated financial statements of the Registrant. See Note A to Financial Statements, Page 29.