Nowadays, the world has turned to promoting the development of energy from renewable sources, because they appear as an alternative to reducing global warming. In Brazil, the main renewable energy sources are the thermoelectric cogeneration of sugarcane bagasse (biomass), wind power and small hydro resources. Besides, the major challenge faced by them is the contracts trade guaranteed by generation profiles that, despite exhibiting a low emission factor, are highly seasonal and uncertain. However, it is known that there is an important complementarity between the availability of resources (sugar cane harvesting, wind and hydrology), which as a consequence, promotes the ability to gain a synergistic effect with the formation of a portfolio containing such sources. The synergy between the resources availability profile of biomass and a small hydro was recently studied by a model of portfolio optimization with risk aversion. This work has two objectives: (i) extend the portfolio trade model of renewable sources to consider also the a wind generation power plant, and (ii) define an optimal strategic bidding (demand side) for a trading company on a contract auction for renewable sources. Two auction formats will be tested and compared in terms of benefit to the energy trading company. Finally, the objective (ii) fills a gap in the literature corresponding to the absence of risk-averse bidding models for contract auctions on the demand side.