[selcuka]

Obviously this is assuming that the energy prices will be stable in the next decades. The AER decided that SA Power Networks can have a total of $3914.2 million from its customers from 1 July 2020 to 30 June 2025, which is already higher than the $600M/year figure above.

Regarding your 10% assumption: In June 2014, the Adelaide Advertiser reported that SA Power Networks made after-tax profits of $420 a year from each customer compared with $92 for another Li Ka-shing-owned utility in Britain. I don't believe the average customer paid $4,200 for energy in 2014, so their profit margin must be much higher than 10%.