In Turkey, fossil fuels have a 90% share in total primary energy consumption, while 80% of fossil fuel consumption is met through imports. This amount, which is a clear indicator of the external dependence on Turkey in terms of energy, can be reduced by utilising local resources. Therefore, using waste wood material, one of the existing renewable energy sources, in existing thermochemical systems, would reduce the country’s energy dependence on foreign energy, and CO2 emissions, one of the most important greenhouse gases, would be reduced. The current study aims to determine how the origin of the waste wood comes from different waste streams and how it affects the combustion behaviour of the wood. Five different waste wood samples from five different sources were analysed using TGA for combustion behaviour analysis.