Sure, there is an evening peak when people get home and start cooking/turning on their homes etc- which can't really be offset with solar (without using storage, battery/hydro). Doesn't negate the fact that solar generation pretty much perfectly matches business usage.
Solar power is not irregular at all, and is entirely predictable with a weather forecast. Unless Australia has an entirely different usage pattern to the rest of the developed world- businesses are perfectly aligned to use the solar power generated during the peak.
"CPSC commissioners in favor of the rule point out that the $200 price difference is dwarfed by the financial cost, and pain and harm caused by 30,000 ER visits and more than 4,000 amputations every year. CPSC's analysis puts the annual cost of table saw accidents at around $4 billion."
[1] http://www.bbc.co.uk/faqs/general/licence_fee