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The current U.S. transmission system will need to be upgraded and expanded to make it possible to carry larger amounts of clean energy across longer distances. In
Currently, there are only five HVDC transmission lines in the United States, the oldest of which was completed in 1970. Historically, DC transmission was more cost-prohibitive and technically complex than HVAC lines, particularly for shorter lines of less than a few hundred miles. But recent advancements have made HVDC lines more affordable and beneficial to the grid.
Fewer wires needed to conduct electricity means the towers that support them are also narrower than their HVAC counterparts. That means that right of way requirements for HVDC lines are also lower than HVAC lines that carry the same amount of power.There are several benefits that could make HVDC transmission lines more appealing for a future grid that involves higher amounts of wind and solar energy.
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