If you choose to have a system under 100kW then you are eligible for Small-scale Technology Certificates, or STCs for short.

The STCs mentioned in your quote are a federal government renewable energy financial incentive. The STCs have been discounted off the price of the job, and you will not be entitled to any other government based financial compensation at the end of the STC process. We will do all paperwork to claim the STCs, and we will need you to be home to sign the STC assignment form on completion of install.

It varies between households. The following are some of the factors that may impact your savings.

• Self-consumption - When your system produces solar power, you can either consume it first or sell the unused energy back to your energy retailer. The savings generated from using the solar power are usually greater than selling back to the energy retailer or the grid.
• System production – Choosing a bigger solar PV system will save you more money in the long run because it produces more kWh of energy. But do take note that, system production is also affected by the following factors such as the location of the installation, site conditions (eg. pitch, orientation, direction), and the quality of the components used in the solar installation etc.
• Energy prices - The worth of your kWh production will only grow as energy prices go up. 

Your net feed in tariff (also known as export metering which pays the PV system owner only for surplus energy they produce) will affect your savings too. It is thus advisable to shop around for solar-friendly electricity retailers when considering accessing feed in tariffs to get a better rate.