Core Biomass has recently installed 1MW Justsen boilers at Hill Brothers in Runcton, Chichester and another nearby at Walton Farm, Bosham for the Langmead group.
The company has another type of 1MW boiler at alstromeria grower Lanoyce nurseries (Saltash, Cornwall) and a 2MW going in now at Bordon Hill Nurseries in Stratford on Avon.
On RHI fuel sustainability requirements, Core are finding that "many of the fuel suppliers used by our customers are already registered, including the majority of those that reprocess wood waste to be used as fuel. Normally they have several categories of fuel available to buy, which ones you can burn is in theory dependent upon what is listed on the boilers.
"We have a lot of customers who are registering as self-suppliers on the list (to burn fuel or waste they produce themselves) - this is allowable up to 1MW plant size."
Core's Matt Baxter said: "There have been no recent tariff reductions. The next time for a possible reduction is end of September this year.
"We should have an announcement soon of what, if any, the reduction will be.
"As of yet, the large boilers (>200kW) have only seen a 10 per cent reduction from the original rate, which actually has been offset by the index linked increases."
Renewble energy tariff RHI payments are down from 8.93p to 7.14p per kilowatt hour for all new applications.
Woodlark is considering installing a biomass boiler.
In line with its renewables obligations, DECC has announced for the quarterly period starting on 1 July 2015 that there will be a 25 per cent reduction to the small commercial biomass tariff.
Fuel prices - a new low
Fuel oil prices have fallen to their lowest in a decade, with some growers paying 41p a litre
for gas oil, making switching to biomass a more complex decision for growers.
British Protected Ornamental Association chairman Simon Davenport said: "Lots of people
are swapping fuels and maybe they wouldn’t have swapped if they knew prices were going to
drop. Those people who have not changed to biomass are probably thinking it is a good decision at the moment."