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Growth on CO2 emissions
#1
Dear Forum,

I have a global model whose base year is 2018. I want to update the levels of global CO2 emissions for 2019, 2020, 2021, and 2022. I thus have set a GROWTH constraint for these years. My questions are:

1. Does the growth constraint stops after 2022? or do I need to specify something from 2022 onwards?
2. Is the UC attached properly defined? I guess not according to my results

Thank you,
Lucas


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#2
Ok, let's briefly look at what you have defined here.
Assume that after the base year (2018), the other milestone years are 2020, 2025, 2030,… , 2100.

  ● As defined, your constraint is a cumulative constraint over the full model horizon 2018–2100
  ● The UC_COMNET multipliers for the VAR_COMNET variables are
     ●  0.007 for 2018;
     ●  −0.049 for 2020;
     ●  0.01 for 2025 and onwards.
  ● The UC_RHS value is 1, and it defines a lower bound for the LHS expression

Consequently, your constraint can be written mathematically as follows:
  0.007 × VAR_COMNET(2018,TOTCO2) × D(2018) +
  −0.049 × VAR_COMNET(2020,TOTCO2) × D(2020) +
  0.01 × VAR_COMNET(2025,TOTCO2) × D(2025) + …  ≥ 1;

I admit that I cannot make much sense out it, even if the type of the constraint had in fact been dynamic, as apparently intended. And even if a dynamic constraint would be correctly defined, in my opinion, a growth constraint is not a very good approach for model calibration. The best way would be to calibrate the underlying energy systems, and not just global emissions, but if one would like to resort to a simple emissions calibration, I would suggest using absolute bounds instead of using a growth constraint.
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