It looks like it's climbing up the mountainside near Somerset West/Sir Lowry's Pass.
Sorry, absolutely no idea! If you contact Eskom they may be able to help.Thank you for the information. Is it the only of its kind?
In France an aerial tramway uses a similiar support
http://commons.wikimedia.org/wiki/File:Seilstütze,_Seilbahn,_Vallee_Blanche,_Frankreich.jpg