EXHIBIT 21 SUBSIDIARIES OF THE COMPANY Pacific Gas Transmission Company, a California Corporation, has the following subsidiaries: Ownership or Percentage of State or Voting Jurisdiction of Securities Incorporation or Name of Subsidiary Owned Organization ---------------------------------- --------------- ------------------- Energy Source, Inc. 100% California PG&E Energy Source Canada, Inc. 100% Canada PGT Australia Pty Ltd 100% Australia PGT Nominees Pty Ltd* 100% Australia PGT Queensland Pty Ltd 100% Australia PGT Queensland Unit Trust 100% Australia PGT Victoria Pty Ltd* 100% Australia PGT Western Australia Pty Ltd* 100% Australia Pacific Gas Transmission International, Inc. 100% California * Created in anticipation of future business activities; currently does no business.