Canada’s economy in the second quarter of the 21st century is being built on the dynamic economic and security development growth of the Northern and Arctic regions, making them more resilient. A critical infrastructure foundation for this growth is advanced electricity transmission connecting the Atlantic, Pacific and Arctic coasts. Electricity transmission is a key part of the Critical Infrastructure Triad (transportation highways, power transmission and communication) for deployment and operations of multimodal Economic and Security Corridors in Canada’s North and the Arctic. It presents a major co-location/co-deployment solution for meeting the Federal Government’s objectives and strategies. To address electricity needs in the North and the Arctic, the interprovincial transmission grid in the National Energy Corridor has to be scaled up by adding a major national-level infrastructure – the Northern Supergrid located close to the provincial-territorial border and linked by power lines with the Arctic coast. To support the Northern Supergrid deployment within the multimodal Northern Corridor, a Transportation Highways infrastructure in the North – the interprovincial Trans-North Highway is proposed. The Trans-North Highway approach addresses existing transportation highway gaps and/or upgrades from winter-only to all-season highways. A phased long-term approach to deploy the Northern Supergrid includes installing a multi-terminal, multi-vendor HVDC transmission system with six Voltage Source Converters (VSC) in selected locations in Alberta, Saskatchewan, Manitoba, Ontario, Quebec, and Newfoundland and Labrador. To better define economic opportunities proposed by the Northern Supergrid, a planning matrix determined by the “east-west” oriented Northern Corridor and the “north-south” oriented Economic and Security Corridors is presented. Leveraging this planning matrix, an inter-provincial infrastructure mega-loop principle is proposed. Based on this principle, Canada’s Southern and Northern Supergrids can be linked in an interprovincial transmission loop from coast to coast. The transmission mega-loop will enable power flow to meet industrial, security and community demand levels currently required across the country. To realise the vision of the National Electricity Strategy, focused on building new critical infrastructure and closely aligned with Canada’s “new plan to defend, build, and transform the North”, a prompt consideration for well coordinated federal, provincial and territorial planning and deployment of the Northern Supergrid as a critical part of the National Energy Corridor is promoted.