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

This submission describes the Commitment Tracking Table No. 2 dated from September 2, 2015 to March 31, 2017 for the Towerbirch Expansion Project.

2017 NGTL System Expansion Project — Commitment Tracking No. 38

All aspects of the life cycle of a pipeline – from design and construction to operation and retirement – are guided by our comprehensive Operational Management System and strictly overseen by regulatory agencies and government departments. That's why every TC Energy pipeline is rigorously and precisely built with high-quality materials and the latest proven technology, and monitored by expert staff, every step of the way. Take the journey with us, and learn about the life cycle of a pipeline from planning to monitoring and beyond.

This report describes the Commitment Tracking Table No. 4 dated from September 2, 2015 to May 31, 2017 for the Towerbirch Expansion Project.