I read further on wikipedia and it mentions that these lines can also be underground. DC cables do not suffer from capacitance issues that AC cables do: &quot;Long underground DC cables have no such issue and can run for thousands of miles.&quot; <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Electric_power_transmission#Underground_transmission" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Electric_power_transmission#Un...</a>