Just looking at the example of British Columbia, the pipeline projects that are proposed in the west coast look at a combined GDP contribution of almost $17 billion to the Canadian economy over the period of growth, with over half of that accruing to British Columbia. The LNG projects have a cumulative GDP effect of $171 billion. That's $386 billion when you include the upstream development of the gas resources in Alberta and British Columbia with the 43,000 jobs proposed. The impact to provinces across the country other than Alberta and B.C. would be $10.8 billion. So these are substantial, staggering amounts of money to the economy over the period of those 20-year horizons.
On February 27th, 2014. See this statement in context.