Black liquor is a by-product of the kraft process used to convert wood into paper pulp. It is a biofuel derived from organic, renewable biomass sources and represents a significant form of industrial energy.
In 2023, the United States led in black liquor energy content with 696.0 PJ, representing 38.9% of the global total. Sweden, Canada, Finland, and Japan followed with 185.1 PJ (10.4%), 157.9 PJ (8.8%), 142.5 PJ (8.0%), and 133.0 PJ (7.4%), respectively.
South Africa was the only African country with reported black liquor production in 2023, totaling 16.4 PJ (1% of the global share). The relatively low share highlights a significant gap in energy recovery from industrial by-products in Africa, especially in relation to the growing pulp and paper industry across the continent.