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Those in neighbouring Poland, for example, are 400 kV and 220 kV.

However, a 330/750 kV reserve line was delivering energy to the grid and could provide power to the plant if necessary, it added.

SCE reported in its letter that it experienced a "relay operation" on the company's Jarvis 12 kV circuit out of a nearby substation.

That portion of the project calls for construction a new substation and adding 3.3 miles of 230-kilovolt lines, upgrading the 115 kV current lines, according to city documents.

The capillary voltage was 3.5 kV in both positive and negative ion mode.