The uncertainty of Energy Yield Assessments (EYAs) for wind and solar projects can fluctuate significantly, typically between 4% to 12%. Operational EYAs tend to have lower uncertainty compared to pre-construction estimates; however, this can vary greatly depending on plant performance and the quality of operational reporting. This presentation will explore: The impact of EYA uncertainty on project finances (debt terms, NPV, ROI), strategies for minimizing EYA uncertainty, such as improved operational reporting and SCADA-based assessments, and a cost-benefit analysis of these strategies.