The level of the tariff applicable to systems installed in the future will decrease with time, according to annual degression rates. The degression rate is used only to determine the tariff applicable to the system based on its registration date – once you’ve been allocated a tariff that rate would apply for the full 20 years.

[For example: If you install a 4kW PV system in June 2010 you would receive 41.3p/kWhr for 25 years until June 2035. If you installed it in June 2012 you would receive 21.0p/kWhr until June 2037. From August 2012 you would get 16.0p/kWh until August 2032]