Alberta Energy Co. Ltd., Calgary, has agreed to acquire the 50% interest in the Express Pipeline and the Platte Pipeline�known together as the 'Express Pipeline system'�that it does not already own from TransCanada PipeLines Ltd. AEC will also acquire TCPL's 50% interest in two partnerships which were formed to act as shippers on these pipelines. The purchase price is about $90 million plus the assumption of $295 million in debt.