Re the probable losses in transmission, I've sat down and re-read the whole Canterbury University article in detail.

They mentioned a 25A limit on an SWER feeder. Given that the highest quoted voltage is 19.1kV (one leg of a 33kV 3-ph system) that works out to a maximum loading of approx. 477kVA (they quote 500kVA, but who's arguing? [Linked Image]).

Given an overall ground resistance of 5 ohms that was quoted above, the loss would be 3125 watts, or less than 0.75% of the power being transmitted. Here are some quick figures for other ground resistance values:

10 ohms, 6.25kW, 1.3%
25 ohms, 15.6kW, 3.3%
50 ohms, 31.2kW, 6.5%
100 ohms, 62.5kW, 13.1%
250 ohms, 156kW, 32.7%

That's at full load, of course. At 25% loading (119.375kW, 6.25A) the figures are more reasonable even at high resistance values:

5 ohms, 195W, 0.16%
10 ohms, 391W, 0.33%
25 ohms, 977W, 0.82%
50 ohms, 1953W, 1.64%
100 ohms, 3.9kW, 3.3%
250 ohms, 9.8kW, 8.2%