The ‘look-up and live’ (or, if you are flying, look down and live) website depicts transmission and power line networks across Australia and New Zealand. When you open the site, you will have to tick the ‘agree to terms and conditions’ box before entering the site.
If the network in your area is not showing, you may have to go to the ‘Layer List’ drop-down (looks like three folders on top of each other) and either choose ‘Turn all layers on’.