The implementation of the energy utility strategies designed to influence customer use of electricity in ways to produce desired changes in the utility’s load shape and provide ancillary regulation services to the grid was carried out since vertically integrated electric industries. In particular, the Demand Response (DR) became a significant part of utilities’ strategies to meet current and future energy end-users needs. The goal is to avoid construction of generation facilities that would be operated for relatively few hours per year and/or costly power purchases, by strategic shifting of customer loads. In this study, a methodology is proposed to select the optimal load management strategy, including on site cogeneration of heat and power by means of local biomass fuel and natural gas, and applied to the case study of a wood processing firm in the Italian energy scenario.