Discount Tony's predictions with caution!
Also the situation in Australia cranked up to 35% of homes with PV due to incentives at a rate that the lines companies struggled (still are) with. Our much lower uptake rate together with lessons learnt from Australia's experience mean we can better upgrade our infrastructure as the growth occurs.
Having said that we are currently seeing a series of power outages as Powerco installs a voltage regulator device in our rural location due to increased demands on their grid infrastructure. Apparently they have chosen to take the cheap option so an indication of continued short term vision and expectations.