this post was submitted on 29 Nov 2023
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Yeah. You build undersea HVDC lines. HVDC was pioneered for undersea cables because it allows smaller cables with lower transmission loss (greater distance) than AC transmission. The other reason is that HVDC is the only realistic way to import/export power between regional AC transmission systems that are not synchronized.
Infact the majority of undersea transmission lines are HVDC: https://en.wikipedia.org/wiki/Submarine_power_cable#Direct_current_cables