Wood energy plantations have shown yields that are been site-specific. In some countries large-scale production is being initiated without knowing the productivity levels they will have in relation to the availability of site resources. Ecophysiological models allow the prediction of productivity of forest plantations using environmental parameters of each species as drivers. The 3PG model has been successfully used in eucalyptus plantations estimations. To date, there are no experiences using this model in high stocking wood energy plantations; this publication aims at the calibration of 3PG to accurately estimate the productivity of wood energy plantations at site-specific level. In order to evaluate the prediction of the 3PG model in wood energy plantations, we used parameters from the literature for Eucalyptus camaldulensis species and evaluated the efficiency of the model in plantations of the same species with stockings of 5000, 7500 and 10000 trees per hectare. These plantations were established at a marginal forest production site, of granite soil type, located at the Biobio region of Chile. When parameterization using values from literature and project parameters, an adequate estimation was evident where allometry allows an adequate adjustment of the model when stocking is considered, thus stocking density is highlighted as one of the most important parameters to be set in the establishment of high stocking forest plantations.