It's worth noting that in Queensland, we saw a big decline in cost after the feed-in tariff was dropped substantially in 2012, reducing demand. I paid AU$8500 f

It's worth noting that in Queensland, we saw a big decline in cost after the feed-in tariff was dropped substantially in 2012, reducing demand. I paid AU$8500 for a 3kW system when I could lock in a 44c feed-in tariff, but everyone knew there was a deadline looming that wasn't changing. Once that deadline hit and it dropped to 6c, demand for installs dropped and the subsequent price dropped towards where we are now. Essnetially, panel and other equipment supply (as well as labour supply) overcame demand and the price fell as a result. We also had the renewable energy credits scheme which made the price float about a bit since they were a traded commodity and the installer would take them off you for a price reduction proportional to their market value (if you elected to not instead keep them for yourself and pay 'full' price, but then have to sell them yourself too). Basically what I'm saying is that there were multiple levers causing the price to float around a lot over the last 5-8 years and it's not strictly just because gradually supply/competition grew.