Ahmed Ibraheem 4/19/2014

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Hi,

I am trying to use LEAP to set a renewable target of 30% by 2040. I used an interp(2040,30) function to set the target under the renewable obligation. Then under the rnewables qualified, I used an interp(2040,20) for hydro and Interp(2040,10) for wind. When I don't restrict the Hydro I get all hydro production that far exceeds the set demand. When I constrain Hydro, I get limited hydro production with massive wind production that again far exceeds the set demand. If I introduce any constrain on wind in maximum capacity or maximum capacity addition, the model finds no feasible solution!

I also tried removing the renewables target and set constraints on maximum and minimum capacity, but no luck.

Any advice would be Appreciated

Thanks

Taylor Binnington 4/21/2014
 

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Hi Ahmed,

Since the renewable target describes the fraction of module requirements that must be met with renewable qualified power, it's possible that some processes with low renewable qualified shares may produce more total power than is actually needed, in order to satisfy the target. Consider a brief example:

- An electricity system must meet 1 MWh of demand, 50% of which must be from renewable sources (so, 0.5 MWh).
- A single process generates 10% renewable-qualified electricity.
- Therefore this process must generate 5 MWh in order to produce only 0.5 MWh of renewable power.

Constraining one of your renewable processes will only add to the requirements from the other. Restraining *both* of the renewable processes may mean that it is impossible to satisfy the Renewable Target, hence, the optimization finds no solution.

Hope this helps,

Taylor

Ahmed Ibraheem 4/22/2014
 

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Thank you so much Taylor,

That does the trick!