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North America's grid interconnections connect the wind power bases in the central and western parts of the continent, the solar energy bases in the southwestern regions and the hydropower bases in Canada to the load centers in the east and west, importing Arctic wind power from Greenland in the east and with interconnections with Asia's power grids through Alaska in the west, to achieve large-area allocation and efficient consumption of renewable energy at the intracontinental and transcontinental levels. North America is one of the most important load centers in the world, abundant with solar, wind and hydropower resources. In order to promote the development and consumption of renewable energy in North America, the United States Department of Energy has proposed "Grid 2030 Plan" to upgrade its electric power system by building backbone grids in the US and a regional network interconnected with Canada and Mexico. In response to the challenge of climate change and as the two-replacement gains momentum, efforts will be stepped up in North America to develop wind and solar energy bases for joint operation with large river-based hydropower stations in Canada and America to transmit power to the load centers in the eastern and western parts of the continent. As renewable energy bases and load centers are unevenly distributed, electricity flows within the continent will rise significantly, necessitating the development of an interconnected system across the continent with UHV grids as its backbone. The hydropower stations in the Columbia River Basin and the Great Lakes region will deliver power to the load centers in western and eastern parts of North America, forming two vertical backbone channels in the east and west. The wind power bases in midwest America, the solar energy bases in the Southwest and the hydropower stations in the Mississippi River Basin in the south will deliver electricity to the load centers in the eastern and western parts of North America, forming the base for a horizontal channel of interconnections across the continent. In addition, the solar energy bases in the American southwest and northwest Mexico will transmit electricity to the load centers in Mexico, creating a grid-covered region in the south as part of the wider grid system of North America and a channel with interconnections with South America. See figure for North America's transnational grid interconnections.