Ok, I’m a bit cynical and did A level chemistry 51 years ago, but ethanol, C2H5 OH in my day, burns and the C still makes CO2. Very marginal benefit to the planet vs other Carbon fuels. Most of the CO2 gains peddled are from photosynthesis of the crop in the field eg sugar beet, only in leaf for part of the year. The tractors planting, spraying and harvesting the crop use diesel. The lorries transporting it to the processing plant use diesel. The fermenting/distillery at the plant will require a large use of energy and create CO2. Then more lorries
Where the claimed benefits really fall apart is that the field would almost certainly grow other crops instead of beet for this specific use. They would also absorb CO2, wouldn’t they?