A FIT is a payment that you receive via your electricity retailer as a credit on your bill for the excess electricity that your solar system produces and that is fed back to the grid. The FIT is a rate that is set per kilowatt hour (kWh), and the eligibility criteria for FITs vary depending on the state you live in. For more information, see Feed-in tariff rates.
In the past, governments have funded specific schemes for large FITs to subsidise the price of solar systems. This is because the cost of a solar system was significantly more than it is today, and an incentive was needed to boost adoption levels. All government-funded schemes have now closed for new customers, and the cost of solar is much more affordable. See Feed-in tariff rates for more information about old schemes.