Thanks for bringing this one to our attention Mr Smith, was just reading the accident report on a wire strike accident this morning.
There is a reference to the Australian standard for marking power lines that states there is no requirement to mark a power line with a height of no greater that 90m (295 feet). So it would follow that if your power line is above this height and it should be marked and should be brought to the attention of trans-grid/country energy, or brought to the attention of ASA who should put it on the map and contact the relevant people and force them to mark the wire.
At the very least I would implore you to submit a chart correction on line
https://www.airservicesaustralia.com...d/default.asp?