Difference between Net metering, Feed-in tariff and power purchase agreement
Net metering gives you one meter. When generating more than you consume, the meter runs backwards. 

Feed-in tariffs are different; I have this in the UK, and I have two meters. I'm paid a certain amount for electricity I generate. I can also use this for free. If I generate less than I use, the original meter runs forwards and I am billed in the normal manner. If I generate more than I use, it does not move. The FIT meter pays one amount and the normal meter charges another; they can be through two different companies.