Hi Daniel -
Without getting into the mixture of fuels used to generate the electricity, let's first focus on the drop in production compared with 2014. Without seeing your Analysis view I can only guess, but I would suspect that if you have entered Historical Production for 2014, that you have entered more than the module is required the generate. Then in 2015 (if that is the First Simulation Year for your processes), LEAP dispatches your processes to meet requirements, following the Dispatch Rule variable.
I would check the results Transformation: Requirements and Transformation: Exports to see whether you have specified more Historical Production than is needed in 2014.
Hope this helps,
Taylor