An Integrated Modelling Framework for Renewable Energy Integration in the Southern African Power Pool (SAPP)

Integrating renewable energy sources into regional power pools, such as the Southern African Power Pool (SAPP), presents a multifaceted challenge due to the intermittency of renewable energy resources (especially in high integration) and limited transmission infrastructure. This paper introduces an integrated modeling framework combining Open-Source Energy Modelling System (OSeMOSYS) for long-term planning, FlexiTool for managing short-term renewable variability, and Power Systems Simulation for Engineering (PSS/E) for grid validation and stability assessment. By linking strategic regional capacity planning with operational feasibility, this framework presents a comprehensive approach to optimizing the high penetration of renewable projects in the SAPP grid. The key focus of this study is on the OSeMOSYS modeling methodology, which is the primary analysis component of this framework. This also includes setting up the model and defining the parameters applicable within the SAPP context. Details of the following steps and a snapshot of some of the interconnector energy trade results are shown. Ultimately, the rationale from the modeling insights presented here can be a reference for other power pools as most regions prepare for regional integration and harmonization, coupled with market reformation, i.e., energy transitions.