China unveiled an epoch-making 1000 kV AC transmission system demonstration project formally during the 2009 international conference on UHV transmission technology, hosted by the State Grid Corporation of China (SGCC), in Beijing during 20 – 22 May 2009. This massive project, albeit still termed a demonstration project, consists of a 640 km long 1000 kV transmission line with two substations and a switching station, with a nominal voltage of 1000 kV and a maximum operating voltage of 1100 kV, and is estimated to have cost RMB5,7-billion (about US$830-million or R6,7-billion). During December 2008 commissioning tests were conducted at the substations and commercial operation started on 6 January 2009…(more)