The 'solar rebate' as a concept is tricky to describe. I go into detail about the 'rebate' here.
You may well remember the furore a few years ago when the Renewable Energy Target (RET) was almost scrapped by the Abbott government. In fact, it was saved by only 1 vote in the senate.
If the RET had been scrapped the solar rebate would have gone with it, and solar power systems would have increased in price by about 40%.
The current legislation means that the solar rebate will start to reduce by one fifteenth every year from Jan 2017 until it drops to zero in 2032. There is no evidence that the government is planning to scrap the rebate entirely before it is gradually phased out.