The South African government's Department of Mineral Resources and Energy (DMRE) is in the process of reviewing the integrated resource plan for South Africa. This report provides up-to-date cost and performance data on renewable electric power generation technologies such as offshore wind, solar thermal, and solar photovoltaic with battery storage; fossil fuel-based technologies such as pulverized coal, open-cycle gas turbine, combined-cycle gas turbine, and internal combustion engines; large-scale nuclear and small modular reactor (SMR) technologies; and energy storage technologies. The study also provides cost estimates for conversion of a coal plant to natural gas plant and coal plant to SMR. This study updates results from a 2020–2021 project by incorporating technology enhancements and better highlighting the potential influence of market factors, enhancements to design, and revisions to cost and performance data. The independent data and expertise presented in this report will facilitate the integrated resource plan (IRP) process for the Republic of South Africa.