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Hi Aba,
There are many different reasons that you could be seeing these results, so I don't want to speculate too much and lead you in the wrong direction. The simplest explanation would be that you haven't specified any historical electricity generation, using the 'Historical Production' tab for your electricity generation process.
My best advice, if you're working through the exercises, would be to select Area:Revert to Version to revert your training exercise to a completed version of the same module. That way you can compare your intermediate results with those of the completed exercise, and see where they differ.
Good luck,
Taylor