For TC Energy, sustainability is foundational in everything we do – in our culture, our stakeholder engagements and partnerships and in our decision-making. To be truly sustainable, we believe we must continue to evolve and innovate to meet society’s challenges and needs.

Stretching 3,340 miles (5,375 km), Columbia Gulf connects to virtually every major pipeline in the U.S. Gulf Coast and to additional Midwestern lines.

This annual report is a comprehensive report on a company's activities throughout the preceding year.

This document is a comprehensive report on a company's financial activities throughout the preceding year.

The Management’s Discussion and Analysis (MD&A) dated February 22, 2007 should be read in conjunction with the audited Consolidated Financial Statements of TransCanada PipeLines Limited (TCPL or the Company) and the notes thereto for the year ended December 31, 2006.