The operational planning of a large-scale industrial batch plant typically occurs over a time horizon of several months with the goal of providing daily production targets and raw material requirements for the plant in question. Due to the length of the time horizon, demand uncertainty should be taken into account in order to ensure that the operational planning model provides reliable production targets and/or raw material requirements. A robust novel operational planning model has been developed in order to address the objective of providing a reliable daily production profile which is immune to various forms of demand uncertainty. The ability of the proposed planning model to address the aforementioned objectives of an operational planning model has been validated through an industrial case study of a large-scale, multiproduct, and multipurpose batch plant having the capability of producing hundreds of different products over a time horizon of three months.