alternatehistory.com

So while doing some reading I came across this passage on an article concerning the War of the Currents:

Converting DC power from one voltage to another requires a large spinning rotary converter or motor-generator set, which was difficult, expensive, inefficient, and required maintenance, whereas with AC the voltage can be changed with simple and efficient transformers that have no moving parts and require very little maintenance.

But then there was the mercury arc valve which was invented in 1902 by Hewitt after the War was over. What if Edison had invented it right at the time when he began constructing his power network? Could this invention save DC power?
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