Yeren-Ulzii Batmunkh 11/11/2013

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Dear Leapers

I face some problems on optimization calculation for electricity generation. In the electricity generation options, I wanna include existing power plant and some of them will be decommissioned few years later (before the end year). to do that I use Step function on Maximum or Minimum capacity variables but it does not work (error occurs). Have can I fix? Also, optimization calculation stacks when I put values on Minimum Addition Size variable?

Taylor Binnington 11/13/2013
 

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Hi Yeren-Ulzii,

For optimized transformation modules, the minimum and maximum capacity variables are used to control the minimum and maximum (respectively) total capacity of each type of plant that is permitted. LEAP uses these variables when it builds new capacity endogenously (meaning, it decides when to build them when results are calculated).

For existing capacity and planned retirements you would use the Exogenous Capacity tab, which would allow you to enter a Step() function.

I'm not sure I quite understand your second question, about 'calculation stacking'. Could you clarify that one for me?

Hope that helps,

Taylor

Yeren-Ulzii Batmunkh 11/14/2013
 

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Thank you Tayler,

I try it but not successful. It seems when Optimize tab is set to Yes(I'm doing optimization), Leap ignore the values of Exogenous Capacity Tab.
My 1st question here, Exogenous capacity tab is work or not? when optimize is set to Yes.
How should I include existing capacity retirements and planned capacity addition during OPTIMIZTION (when Optimize tab is set to Yes)?

Thank you Tayler, your advises would be very valuable for me.

Taylor Binnington 11/19/2013
 

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Hi there,

Hm, I'm afraid that LEAP doesn't just ignore exogenous capacity additions in an optimized transformation module. Are you certain that you've specified a large enough value in the Exogenous Capacity tab to be able to see it, when you view Results? Be sure to keep an eye on the units of the Exogenous Capacity that you're adding.

That said, I should make you aware of some issues that you may run into while using the optimization algorithm. We are aware of these and they are being addressed in the next version of LEAP, which will be released not too long from now. In short, current limitations do not permit the direct comparison of costs between optimized and non-optimized scenarios. Part of this is due to the fact that Exogenous Capacity that is specified in Current Accounts is assumed (by Optimized transformation modules) to be built in the first scenario year, rather than treated as pre-existing capacity. In addition, any capacity that is built in an optimized transformation module will not be retired, even if the length of the scenario exceeds the lifetime of the transformation process.

If you find that you encounter other issues, I'm happy to help answer further questions on the topic, but to summarize - there remain other kinks in LEAP's implementation of the OSeMOSYS optimization routines, which will be resolved shortly. However, the ability to add exogenous capacity is not one of them, so you should be able to do this without a problem.

Hope this helps,

Taylor