Emissions and energy
GRI 103-1, 103-2, 103-3 SDG 11.6, 13.2
Aware that intense climate variations can adversely affect our operations, delay timetables and raise operating costs, among other business risks, we remain committed to the topic and set goals to strengthen a low-carbon economy and build an increasingly sustainable society.
We aim to reduce greenhouse gas (GHG) emissions by 5% per tonne of product by 2025. Toward this goal, since 2017 we have put into operation a biomass boiler at the Três Marias unit, replacing boilers fueled by petroleum-derived fuel oil, which allowed us to save US$ 5.2 million per year, reducing greenhouse gases emissions by 30% and lowering the cost of steam production by 35%. The structure uses eucalyptus wood chips and/or bagasse produced in the region as fuel. The next step is to introduce the biomass into the unit’s operation for steam production. This model, proved efficient in Três Marias and next should be deployed at the Juiz de Fora unit. SDG 7.2, 9.4, 12.2
Another important initiative is underway at the Cajamarquilla unit in Peru: the substitution of diesel oil with natural gas, made possible through the implementation of a gas pipeline in the region. Installation began in 2018 and operations will begin in 2019, reducing the plant’s emissions and fuel costs.
To reduce GHG emissions in operations and logistics, we signed contracts with startups selected through the Mining Lab program to develop solutions to reduce diesel consumption in equipment and its replacement with biodiesel (more details in Innovation and Technology).
The consumption of thermal energy in our operations for the year totaled 14,970,823 GJ, an increase of 0.1% compared to 2017, of which 11,742,700 were from renewable sources. This proportion particularly reflects the Brazilian and Peruvian electric power matrixes, since both of their bases use a higher share of water sources.
In the year, electricity generation represented 19% of the total consumed. Cogeneration is used for steam boilers and generation in power plants and small hydropower projects, managed by Votorantim Energia (which serves Votorantim S.A.’s subsidiaries and also outside clients). GRI 302-1
Energy consumption inside and outside the organization GRI 302-1, 302-2
For the year, the greenhouse gases (GHG) from our operations totaled 1,269,670 tCO2e, 37% more than the previous year due to an increase of ore production and transportation. Emissions from electricity consumption (Scope 2) accounted for 46% of the total and indirect emissions (Scope 3) totaled 30,661 tCO2e. The emission intensity raised to 1.15 tCO2e per tonne of zinc produced. GRI 305-1, 305-2, 305-3, 305-4
Energy intensity Gj/ton
Intensity of GHG emissions (tCO2e/t) GRI 305-4
Greenhouse gas emissions (tCO2e) GRI 305-1, 305-2, 305-3