25 of our sites emit 70% of our total Scope 1 and 2 greenhouse gas (GHG) emissions; these sites are mostly located in Australia and South Africa. This group of sites is the primary focus of the study on carbon reduction and target setting that we carried out in 2016.
We use renewable energy sources where we can.
In Kazakhstan, Kazzinc operates the Bukhtarma hydroelectric plant, which has nine 75MW turbines with a total generating capacity of 675MW. Bukhtarma generated around 3 billion kilowatt hours of electricity in 2015, covering up to 68% of Kazzinc’s electricity requirements. If this energy were generated by a conventional fossil fuel-based power plant, it would have released the equivalent of 1.5 million tonnes of CO2.
In addition, almost all the electricity used by our assets in the DRC and Zambia, which run some of the Group’s largest operations, is generated from renewable energy (hydropower).
We use waste gas from our coal mines to supplement power generation at a number of our Australian operations.
We have flares installed at those Australian underground coal mines with the necessary supply and concentration of methane. In 2015, these sent more than 60,000 tonnes of methane to flares and over 20,000 tonnes to coal mine waste gas power stations, resulting in the abatement of over 1.4 million tonnes of CO2e.
This year the Greenhouse Gas (GHG) Protocol guidance defining Scope 2 emissions has changed, incorporating location and market-based elements.
The definition change as led us to report three separate values for this indicator in 2015. More details are available in the databook connected to this report. The IEA and a number of governmental bodies have also provided updates for grid emission factors. In addition, our figures for GHG emissions from fossil fuels now consistently include methane and nitrous oxide as well as carbon dioxide (CO2). These updates have required us to restate previous figures.