How to set the upper bound for secondary outputs

[thuliuyang]

Hi GCAM team,

I have set up a secondary output for the industry sector and want to constrain the upper bound. I tried to constrain it using Policytype as RES and tax respectively, but it didn't work (code below). I am requesting help with this.

        <policy-portfolio-standard name="death">
            <market>death_market</market>
            <policyType>RES</policyType>
            <constraint year="2020">1600000</constraint>
            <min-price year="2020">0</min-price>
            <constraint year="2025">1280000</constraint>
            <min-price year="2025">0</min-price>
            <constraint year="2030">1024000</constraint>
            <min-price year="2030">0</min-price>
            <constraint year="2035">819200</constraint>
            <min-price year="2035">0</min-price>
            <constraint year="2040">655360</constraint>
            <min-price year="2040">0</min-price>
            <constraint year="2045">524288</constraint>
            <min-price year="2045">0</min-price>
            <constraint year="2050">419430.4</constraint>
            <min-price year="2050">0</min-price>
            <constraint year="2055">335544.32</constraint>
            <min-price year="2055">0</min-price>
            <constraint year="2060">268435.456</constraint>
            <min-price year="2060">0</min-price>
        </policy-portfolio-standard>

 <supplysector name="agricultural energy use" >
                <subsector name="coal" nocreate="1">
                    <stub-technology name="coal">
                        <period year="2015">
                            <res-secondary-output name="death">
                                <output-ratio>38258.2191075305</output-ratio>
                                <pMultiplier>0</pMultiplier>
                            </res-secondary-output>
                        </period>
                    </stub-technology>
                </subsector>
            </supplysector>

[pkyle]

Normally the market is either a region or "global", so I'd recommend you try running it in a single region just to start, and assign that region's name as the market. Another thing is that assigning a pMultiplier of zero means that the constraint can't pass its price/cost to the agricultural energy use commodity, which is how the model would constrain the demand if it exceeds the target. So I'd set that to 1. Also check the price-elasticity of the energy-final-demand for agricultural energy use, and make sure it's something reasonably responsive. I'd probably start with -1.
One last thing to be aware of is that agricultural energy use is a final demand, typically classified with industrial energy use in post-processing. It is not an input to crop and livestock production. You could set agricultural energy use to zero, and that would have basically no discernible impact on food prices, yields, consumption, etc.

[thuliuyang]

Thank you so much, Page! I really appreciate your suggestion, and I'll give it a try.
In the past weeks, I had tried not using the secondary output structure and instead adding death as a non-GHG to the model and then adding constraints. It looks like this approach works, and I was able to start my work on it, which is great!