The Ulster Farmers' Union (UFU) has said it is "bewildered and frustrated" by a proposed tariff increase to the RHI scheme in Northern Ireland.
Tariffs were slashed in the wake of the original botched green energy scheme after it was revealed the government was handing out subsidies so high that it paid users to burn wood pellets. The 'cash for ash' scandal led to the collapse of the Stormont Executive in 2017.
An independent review of the tariffs has recommended increasing the medium biomass tariffs in order to achieve "the appropriate return on investment".
However, the UFU said the increase would not benefit struggling boiler owners.
UFU deputy president Victor Chestnutt said: "The tariff increase that has been proposed by DfE doesn't even come close to what [the UFU] called for last month."
He added: "What is even more confusing is that the recommendation comes on the back of a report by Cornwall Insight which recognised a rise in fuel prices as well as boiler service and maintenance costs.
"Yet DfE have only increased one tariff by 0.7p and the other by 0.1p which could result in many boiler operators moving to oil-centred heating especially with the current price of oil."
The Department for Economy has been approached for comment.