Enbridge’s GTA Project significantly upgrades the natural gas distribution system to Toronto and surrounding communities, and is the utility’s first major network upgrade in 20 years. The project comprises an unodourized NPS 42 pipeline (27km), odourized NPS 36 pipeline (23km) and several new/upgraded station facilities. This presentation will highlight the formidable undertaking of construction in a congested landscape (including contingency planning for work near existing vital mains), tie-ins, commissioning, and additional work for operational readiness.