The company that manages Ireland West Airport Knock has been fined a total of €10,000 for the illegal use of green diesel.
RTE reports that Connaught Airport Development Company Limited pleaded guilty to four counts of illegal use of green diesel in vehicles, including a de-icer, a snow plough, a small bus for transporting passengers, and a fuel tanker.
Tubbercurry District Court heard that airport management co-operated with officers employed by the Office of the Revenue Commissioners and accepted that green diesel was being used in 14 vehicles at the Mayo airport.
Evidence given outlined that officials claimed they were not aware the practice of using green diesel was illegal and that they had "always" used the fuel.
The court heard that management believed - as the vehicles were not on public roads - the fuel was permitted to be used but since the detection, all use of green diesel has ceased at the airport.
Judge Kevin Kilrane said it was a negligence matter more than intent to defraud, adding that the airport was a vital link in the west.
Judge Kilrane convicted Connaught Airport Development Company Ltd on all four counts, fining the company €2,500 in each matter.