About - Energy Analysis of Walnut Production (California)

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Project sought to understand the magnitude of energy expenditure in the drying process of the walnut industry in California, in order to inform innovation in drying technology. Based on surveys conducted through the project duration and a review of historical published data, the largest energy use is due to transportation at 59% (out of the 13 MJ/kg of walnut produced in 2009), due to concentrated walnut processing in California’s Central Valley which required subsequent distribution to consumers elsewhere. Drying accounts for 1.1 MJ/kg in 2009, a significant reduction from 21 MJ/kg in 1980 due to energy efficient technologies.

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