Western Australia and the Northern Territory are not connected to the NEM .
The NEM began operation on 13 December 1998 and operations currently includes Queensland , New South Wales , Australian Capital Territory , Victoria , Tasmania and South Australia .
Australian Capital Territory   and the Northern Territory are not connected to the NEM .
The NEM began operation on 13 December 1998 and operations currently includes Queensland , New South Wales , Australian Capital Territory , Victoria , Tasmania and South Australia .