Maps

Bulk Provincial Transmission System

The bulk transmission system is the major lines or "backbone" of the transmission system that provides large amounts of power to the province.

• Provincial Transmission System [PDF, 1.5 MB] – Map of the entire provincial bulk and regional transmission system, updated April 2025.
• Transmission Oneline Diagram [PDF, 315 KB] – Single line diagram of the entire provincial bulk and regional transmission system, updated March 2025.
• Bulk One Line Diagram [PDF, 154 KB] – Single line diagram of the 500 kV bulk system plus the named WECC Paths 1 and 3, updated 2024.

BC Hydro is a member of the Integrated Cadastral Information Society, and posts weekly mapping updates including the locations of the T&D lines and structures. Organizations wishing to download a copy of BC Hydro's GIS data are directed to become ICIS members, and then may access the data on-demand from the ICIS Data Portal.