A feed-in tariff (FiT) usually is not a fee you pay; it is the credit your electricity retailer offers for solar power exported to the grid. The rate varies by retailer, state, electricity plan and export limits, and it can change over time. Your bill savings also depend on how much solar you use at home, because self-consumed energy generally avoids buying electricity at a higher retail rate. Compare current plans through your retailer or an independent government comparison service, and check the full rates and conditions before switching.