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Hi Abdullah,
I'm afraid I'm having trouble understanding your question. Are you unsure why electricity generation (the result Transformation: Output by Output Fuel) for your Natural Gas process declines, while Exogenous Capacity for the process is increasing?
If so, there are several reasons this may be the case. Most importantly, generation is not the same as capacity, which means that even though you continue to add capacity each plant is still being dispatched according to its Merit Order. You have assigned a Merit Order of 1 to each process, so all plants are dispatched to meet the module's requirements in proportion to their available capacity. As Exogenous Capacity for each plant changes during your scenario period, you will then find that the share of electricity generated by each plant will change.
Have a look at the following help pages for a description of Merit Order:
http://www.energycommunity.org/WebHelpPro/Transformation/Merit_Order.htm
...and LEAP's process dispatch calculations:
http://www.energycommunity.org/WebHelpPro/Transformation/Process_Dispatch_Calculations.htm
Hope this helps,
Taylor