[EXHIBIT 21a TO COLONIAL GAS COMPANY FORM 10-K FOR YEAR ENDED DECEMBER 31, 1998] Colonial Gas Company Subsidiaries of Registrant Subsidiaries Organized in: Ownership: (a) Transgas, Inc. Massachusetts 100% (a) CGI Transport Limited(b) Canada 100% (a) Included in consolidated financial statements. (b) Owned by Transgas. [END OF EXHIBIT 21a TO COLONIAL GAS COMPANY FORM 10-K FOR YEAR ENDED DECEMBER 31, 1998]