Negative marginal costs

[Paul Reggentin]

Hi Fabian,

Thanks for all of the help with the model & especially with the quick responses.

I'm currently finalizing my model and trying to run some analysis on it, but there's a part of the costs.csv file that I don't understand. Specifically, there are negative marginal costs for a few elements, specifically: 

DC and H2 links, 

co2, 

co2 stored, 

and urban central water tanks.

I'm trying to split up system costs by sector and carrier, and I can't quite understand why these costs would be negative. Would it make more sense to ignore them, or to sign correct them?

The negative costs have a magnitude of  only around 0.001% of the total costs, so they don't really affect the result, but I was just wondering if there's a way to explain where they come from.

Best,

Paul

[Fabian Neumann]

Hi Paul,

you can ignore these very small values.

As you say, they make only a very small fraction of TSC, which is close
to the solver convergence tolerances, e.g. 1e-4, 1e-5.

Best wishes,

Fabian N

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Dr.-Ing.
Fabian Neumann (he/him)
Postdoctoral Researcher

Department of Digital Transformation in Energy Systems
Institute of Energy Technology
Technische Universität Berlin

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