The Enbridge Mainline, by far the largest transportation network for growing Western Canadian crude oil supplies to the U.S. Midwest, Gulf Coast and Eastern Canada, recently received regulatory approval for the tolls that it charges shippers for using the massive pipeline system. As we discuss in today’s RBN blog, the Canada Energy Regulator’s (CER) thumbs-up ensures another five years of shipping cost predictability and comes as the Canadian oil pipeline landscape is about to permanently change with the pending startup of the 590-Mb/d Trans Mountain Expansion Project (TMX).