Fig. 1: Technology and emission patterns of global aluminium smelters and their fossil fuel-based captive power units in 2021.
From: Different technology packages for aluminium smelters worldwide to deliver the 1.5 °C target
a, Geographical distribution of aluminium smelters and fossil fuel-based captive power units. Icons may overlap because of the close proximity of many units. b, Energy intensity of smelters categorized by different age groups within each amperage category. c, Distribution of captive power units by installed capacity (left) and generation technology type (right), across different age groups. d, Electricity generation emission factors for coal-based (left, by unit) and gas-based (right, with the error bars showing maximum and minimum emissions intensity range from literatures) captive power units, categorized by generation technology. The average energy intensity of each smelter amperage group and the average electricity emission factor of each generation technology are shown by purple dots in b and d, respectively.
