EHV and UHV transmission can have important advantages such as a very high power capability for each right-of-way and a reduction in the number of transmission lines required.

• 以尽可能高的电压来输电以节省导线材料看似很可取，然而，必需意识到高电压传输会导致变压器，开关设备和其它仪器花费的增加，因此，对于电压传输有一定的限制，这使得它能够在具体情况下经济使用。