It would be interesting, but expect they will use the reasons outlined above (demand by their customers of green energy and supply of green energy on their network) and also possibly that their green energy comes from large-scale generators where the generation variability (while still high compared to traditional generation) is lower than small scale PV generation. The comparability lower variation means it is easier to meet the demand for customers which have signedon for green energy.
If for example some, not all small scale PV generation was used at times to support supply to green energy customers, it would be an administrative nightmare to work out who supplied when and how much to whom. As Queensland doesn’t mandate smart metere, tge task would be impossible without upgrades.
I also forgot to mention that Choice covered FiT in their September magazine…can’t seem to find it on the web. It provides a good synopsis of the FiT in Australia. The article also indicates that the minimum FiT for NQ is not set by Ergon, but the Queensland Competition Authority…and is currently a minimum 7.842c/kW.
The article also states that a retailer has no obligation to pay FiTs and in Australia, current new connection FiTs are as little as 0c/kW. Looking at this, what Ergon is offering (and set by the QCA) is better than offered in some other states.