How much you can claim back through the STC solar rebate scheme depends on a number of factors. The first of these is the rating number of the zone you live in. This is calculated according to how much solar energy the Clean Energy Regulator – a Federal Government agency – has determined you could collect in a certain geographic zone.
If you live in the Central Coast region, for example, you'll be in Zone 3, with a rating of 1.382. With 12 kW system and a deeming period of about 12 years, you could be eligible for up to 199 STCs. So what are these worth? That question brings us to the second factor of the scheme, which is the dollar value of an STC.
The tricky thing here is that the dollar value of an STC can fluctuate. Presently the value is around $36.50, but by the time you read this the value may have gone up or down. If you did cash in the full 199 STCs at $36.50 that would give you a potential rebate of about $7263.50, which is pretty good. The bad news is that you can expect the value of an STC to drop significantly each year, and should drop all the way to $0 by 2030, which is why buying in as early as you can is the right way to go.
Now, it would be great if this was like a normal rebate and you could just rock up to a counter somewhere and get your rebate paid to you immediately, but that's certainly not the case with STCs.