And if you read down into the article whose URL I posted you find that all these years later there are customers with large installations that still require D.C., such as elevator motors where it is cheaper to install the rectifiers to replace the D.C. from the now closed Edison plant.
Another customer that in fact uses massive amounts of D.C. happens to be the New York subway system, parts of it over a hundred years old, whose third rail distributes D.C. from massive rectifying sub-stations, those stations distributed every couple of miles or so, because of resistive losses of D.C. over distance, throughout the system.
