Also interesting to read about the work ConEd did to move its final customers off DC in NYC http://www.coned.com/newsroom/news/pr20071115.asp http://www.coned.

Also interesting to read about the work ConEd did to move its final customers off DC in NYC http://www.coned.com/newsroom/news/pr20071115.asp http://www.coned.com/newsroom/news/pr20071115.asp >In January 1998, Consolidated Edison began a program to eliminate DC service in its operating territory. At that time there were over 4,600 DC customers. By 2006, sixty remained. Between then and today[2007], when the last customer at 10 East 40th Street was switched to rectifiers on their side of the meter to generate direct current to supply its building’s elevators and sprinkler system, Con Edison has been switching DC customers to alternating current. Since the start of the program in January 1998: 4,541 accounts in 4,288 buildings have been converted; 6,172 DC meters have been removed from the system; 193 in-building rectifiers have been transferred to customers; 148 250KW street rectifiers have been removed; 35,965 sections of DC mains (5,682,337 circuit feet or 2,660,634 cable feet) has been retired; and 545,185 circuit feet or 236,611 cable feet of DC services has been retired.