Editing Electric power transmission (section)

=== Grid input ===
{{Unreferenced section|date=November 2022}}
At [[power station]]s, power is produced at a relatively low voltage between about 2.3&nbsp;kV and 30&nbsp;kV, depending on the size of the unit. The voltage is then stepped up by the power station [[transformer]] to a higher voltage (115&nbsp;kV to 765&nbsp;kV AC) for transmission.

In the United States, power transmission is, variously, 230&nbsp;kV to 500&nbsp;kV, with less than 230&nbsp;kV or more than 500&nbsp;kV as exceptions.

The [[Western Interconnection]] has two primary interchange voltages: 500&nbsp;kV AC at 60&nbsp;Hz, and ±500&nbsp;kV (1,000&nbsp;kV net) DC from North to South ([[Columbia River]] to [[Southern California]]) and Northeast to Southwest (Utah to Southern California). The 287.5&nbsp;kV ([[Hoover Dam]] to [[Los Angeles]] line, via [[Victorville]]) and 345&nbsp;kV ([[Arizona Public Service]] (APS) line) are local standards, both of which were implemented before 500&nbsp;kV became practical.