Westcoast Energy is considering expanding the southern portion of British Columbia’s main gas line because of growing demand for natural gas in the US Pacific Northwest. Talk of the expansion by the Vancouver-based pipeline and utility company comes amid booming drilling activity in NE British Columbia and the southern Northwest Territories, as well as surging demand for gas to fuel electricity generation in the Pacific Northwest and California. Westcoast said all renewable, firm-service contracts to ship gas on that portion of the line, which can handle 1.8 billion cubic feet a day, were spoken for. Known as T-South, the line runs to Huntingdon-Sumas on the western British Columbia-Washington border from Fort St John in the province’s gas-rich NE.