A feed-in-tariff also credits customers for energy produced onsite. However unlike net metering, which provides bill credits in exchange for electricity delivered to the grid, customers using a feed-in-tariff are paid for the power they produce.
The rate at which they are paid may be higher or lower than the price at which they buy electricity. Many feed-in-tariffs also use a buy-all, sell-all arrangement whereby all the energy produced is delievered to the grid, and the customer is not able to use it onsite.
Different utilities have different net metering policies and rules, so be sure to inquire first before installing your system.