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Hi Abdullah,
I'll address each of your questions individually:
1) I don't think that I understand you question. You have said that other users on the LEAP forum have faced the same problem - could you provide a web URL of a forum post where you found a user with the same problem?
2) If you *know* that 81 GW will be installed by 2030 (for example, if national plans provide this target), then the simplest method would be to enter these capacities for each generation process using the Exogenous Capacity. For example, for Hydro, you could enter Interp(2010,0,2030,28).
It's possible to accomplish something similar using Endogenous Capacity, but I would first encourage you to read through these pages for a description of both types of capacity:
http://www.energycommunity.org/WebHelpPro/Transformation/Capacties.htm
http://www.energycommunity.org/WebHelpPro/Transformation/Endogenous_Capacity.htm
3) Again, I think that the simplest way to do this is using the Exogenous Capacity variable. You would just need to modify the expressions that you enter in each scenario.
Hope this helps!
Taylor