The electricity generation sector in Poland is largely fossil-fuel–based. Many power plants nationwide use Poland's position as a major European exporter of coal to their advantage by continuing to use coal as the primary raw material in the production of their energy. In 2013, Poland scored 48 out of 129 states in the Energy Sustainability Index. The three largest Polish coal mining firms (Węglokoks, Kompania Węglowa and JSW) extract around 100 million tonnes of coal annually.