State and territory government rebates: In addition to the federal STC scheme, many Australian states and territories offer their own solar rebates or financial incentives. These rebates vary from state to state and may include upfront grants, feed-in tariffs, or low-interest loans. Some states also have specific programs for low-income households or businesses in regional areas.

Here is a summary of some of the state and territory government rebates available:

1. New South Wales: The NSW government offers the Empowering Homes Program, which provides interest-free loans for Solar and battery storage systems. There is also a Solar for Low Income Households Program that provides discounts for eligible households.

2. Victoria: The Victorian government offers the Solar Homes Program, which provides rebates for Solar panels, Solar hot water systems, and battery storage systems. There is also a Solar for Business Program that provides financial incentives for businesses to install Solar panels.

3. Queensland: The Queensland government offers the Solar for Rentals Program, which provides rebates for landlords to install Solar panels on rental properties. There is also a Solar for Schools Program that provides grants for schools to install Solar panels.

4. South Australia: The South Australian government offers the Home Battery Scheme, which provides subsidies for home battery storage systems. There is also a Virtual Power Plant Program that allows households to sell excess Solar energy back to the grid.

5. Western Australia: The Western Australian government offers the Renewable Energy Buyback Scheme, which provides a feed-in tariff for excess Solar energy exported to the grid. There is also a Solar Schools Program that provides grants for schools to install Solar panels.

6. Tasmania: The Tasmanian government offers the Solar Hot Water Rebate Program, which provides rebates for Solar hot water systems. There is also a Solar Feed-in Tariff Program that provides a feed-in tariff for excess Solar energy exported to the grid.

7. Northern Territory: The Northern Territory government offers the Rooftop Solar Program, which provides rebates for rooftop Solar panels. There is also a Remote Solar Program that provides financial incentives for remote communities to install Solar power systems.

It is important to check with your state or territory government for the most up-to-date information on available rebates and incentives for Solar energy systems.