Hello everyone, in the transformation block to model electrical energy generation, the parameters of efficiency and maximum availability are required. In the LEAP help "Efficiency" is defined like this: The default method is to specify the percentage ratio of energy outputs (not including any co-product energy recovered) to feedstock An input fuel consumed by a Transformation conversion process. energy inputs in each process. All efficiencies must be greater than zero. When entering efficiencies for processes, around 33% is typical for base-load steam generation. This also may be used as a nominal value for hydro-electric stations so that primary resource A fuel that has not been converted or processed such as coal, crude oil, hydropower, solar, wind, etc. requirements for fossil fuels and hydro can be easily compared. Another common approach is to use a 100% efficiency for hydropower and renewable electricity generation systems. If you specifically enter imports as one of the process types, enter 100% for their efficiencies.