High Quality Content by WIKIPEDIA articles! FortisBC Energy, Inc., formerly known as Terasen Gas, is the largest distributor of natural gas in British Columbia, Canada, serving approximately 920,000 customers in over 125 communities. The company owns and operates 44,100 kilometres of gas distribution pipelines and 4,300 kilometres of gas transmission pipelines. Its service territory includes Lower Mainland, Vancouver Island, and the southern interior of the province. Terasen Gas is regulated by the British Columbia Utilities Commission (BCUC).