Industrial energy efficiency has received increasing attention in many countries because of its importance in the pursuit of energy supply security, increased economic competitiveness and in the mitigation of greenhouse gases emissions. This paper aimed to evaluate the energy consumption development of the Brazilian pulp and paper industry through an energy decomposition analysis and an energy efficiency index approach over a 30 years period. An international comparison with other important paper-producing countries (i.e., Canada, United States of America, Finland and Sweden) was carried out. It was concluded that despite a significant increase in the energy efficiency levels, responsible for 5.6 PJ savings in electricity consumption and for 38.6 PJ savings in fuels consumption between 1979 and 2009, a saving potential of 7.8 PJ and 146.2 PJ related to the annual consumption of electricity and fuels, respectively, could be identified in the Brazilian pulp and paper industry. Among the countries evolved in the international comparison, both the Swedish and Finnish industries were the most efficient, followed by the Brazilian, American and Canadian, the latter being the only one where there was a reduction in the energy efficiency levels from 1979 to 2009.

Brazil has great potential for biomass production. There are several processes to convert biomass into energy, among these is the biological conversion of organic carbon into methane. This work aimed to estimate the production of biogas in a poultry slaughterhouse in Matelandia state of Paraná, Brazil, by the IPCC methodology. The poultry slaughterhouse slaughter 140,000 poultries a day and generates a wastewater FLOW OF 3,360 m 3 .d-1. Electricity consumption by the industry plant is about 3,600 MWh.month-1. The treatment system used in industry is the physical and biological process, and the pre-treatment consists of a static sieve and a flotation equipment, followed by stabilization ponds. Two anaerobic ponds were covered with a geomembrane of High Density Polyethylene and was installed a gas meter to measure the flow rate of biogas production. The biogas generation potential estimated can reduce 3.89% of the electricity consumed.