We especially need to understand what is being done to the load profile by the "scaled annual average".

The scaled average value is a mechanism that lets you scale the whole annual data set up or down, which you might want to do to convert units or do a sensitivity analysis such as "what would happen if the load grew by 30%?".  By default the scaled average will be set to the unscaled average, in which case the scaling process has no effect.  Please look up 'scaled annual average' in the index of the Help system for more information.