Feed-in tariffs (FITs) for anaerobic digestion (AD), standalone PV and wind installations sized at 100-1,500kW have been in so much demand that installations are now queued to the first or second quarter of 2017.

The quarterly spending caps were introduced by the Department for Energy and Climate Change (Decc) last year as way to control spending on FITs. Detailed caps are set out for each technology and size each quarter.