Freezing is one of the most cost-effective methods of food preservation. The unit cost per ton is significantly lower than any other method of preservation. With today's strong emphasis on energy conservation, freezing is one of the most energy efficient methods of food preservation. When compared to canning, for example, the energy index is about only half. Freezing plants require less production space per unit volume of food produce than any other form of preservation.
Frozen food offers considerable flexibility in packaging.