Koen van Bemmelen updated gas turbine combined heat and power (CHP) conversion efficiencies in the quintel/etsource repository, focusing on improving the accuracy of generation forecasts and policy analyses. He used configuration management and data update skills to adjust steam hot water output efficiency downward and electricity output efficiency upward, reflecting the latest dataset findings. The changes were implemented in YAML, ensuring minimal disruption to existing models and maintaining integration with current tests. Koen’s work addressed the need for more precise energy modeling, delivering a targeted feature update with careful validation and a clear focus on data-driven improvements within the project.