Eskom Estimates (South Africa)

Hi all,
I'm attempting some loss calculations for the national grid and cannot
get hold of some crucial information, so I was wondering if anyone
could help me guess/estimate a few figures.
I need to know the average length of a transmission line, distribution
line and reticulation line in South Africa. I don't need the average
length at every voltage level, just in the general categories will do.
Thanks.