The Department of Energy and Climate Change have issued an updated forecast for the non-domestic RHI, the report can be accessed here.
As a result of the budget control mechanism which DECC use to control the RHI budget spend the medium size biomass tariff is reducing slightly from 5.3p tier 1 and 2.2p tier 2 to 5p and 2.1p respectfully; a 5% reduction effective 1st July 2013. All other tariff levels remain unchanged.
Medium size biomass covers boiler sizes from 200kW to 1 MW output.