The influence of the usage of production capacity on the unitary energy consumption index of a row beetroot juice in fruit-vegetable processing plant of medium production capacity was examined. It was proved that decrease of the usage of production capacity from 96 to 12% caused almost threefold increase in electric energy consumption index from 6,7 kWh/t of reworked row material to 18,8 kWh/t. While, the total electric energy and heat energy consumption index in terms of primary energy/ton of, extracted from row material, extract increased in these conditions twice from 3,2 CJ/t to 6,4 CJ/t.