The fonds consists of records created or accumulated by Wescoast Energy Inc. its predecessor company Westcoast Transmission Company, Limited, and their subsidy companies. Records relate to the activities of these companies and the gas and energy industry in British Columbia and North America, and have been arranged into the following eleven series: legal and financial records (1950-1996); record books and minute books (1949-1980); subject files (1949-2000); corporate publications (1950-2002); publications relating to Westcoast Energy Inc. and its subsidiary companies (1957-2002); books, articles and other publications relating to the energy industry in British Columbia and North America (1897-1996); executive speeches and addresses (1957-1997); photographs and slides (1950s-1994); video recordings (1978-1995); scrapbook (1957); and maps and plans (1945-1994).