Despite the fact that the environmental compatibility study presented by Herambiente proves that the request to replace the ancillary fuel used by the plant (methane) with a renewable energy source (cellulose wood biomass) does not have negative effects on the environment (so the conditions for the IEA procedures would not apply), the Ferrara Provincial Authority, under resolution 251 dated 20 September 2011, ruled that the project be subject to IEA.