Anode electrical resistivityAnode electrical resistivity is a critical propertyProperties that directly influences the energyEnergy balance, current efficiency and operational stability of the Hall-Héroult process. Maintaining low and stable resistivity ensures uniform current distribution and contributes to the performance and longevity of the reduction cellReduction cell. Ensuring optimal resistivity is complex and demands rigorous control of primary materials and recipes, as well as appropriate manufacturing processes, from the paste plant to the anode baking furnaceAnode baking furnace. A wide initiative was launched at the Rio Tinto Grande-Baie plant to improve the resistivity of pressed anodesPressed anodes, allowing for the identification and mitigation of factors contributing to its degradation. Extensive analyses and trials were carried out to better understand key parameters such as forming temperature, forming pressure, and pitch adjustment. Implementing the insights gained from these studies led to a resistivity reduction of 5 μΩ∙m, and several measures have since been adopted to ensure the long-term sustainabilitySustainability of these improvements.