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update carbon price correction rules #2359

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update carbon price correction rules #2359

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c1187d9
update carbon price correction rules
robertpietzcker Jun 3, 2026
1c1ae9b
update price adjustment
robertpietzcker Jun 3, 2026
b1c3755
update values
robertpietzcker Jun 3, 2026
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2 changes: 1 addition & 1 deletion modules/47_regipol/regiCarbonPrice/declarations.gms
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Original file line number Diff line number Diff line change
Expand Up @@ -60,7 +60,7 @@ $endif.emiMktTargetType
p47_slopeReferenceIteration_iter(iteration,ttot,ext_regi) "auxiliary parameter to store reference iteration used for calculating slope of current mititgation cost [#]"
pm_factorRescaleemiMktCO2Tax(ttot,ttot2,ext_regi,emiMktExt) "multiplicative tax rescale factor that rescales emiMkt carbon price from iteration to iteration to reach regipol targets [%]"
p47_factorRescaleemiMktCO2Tax_iter(iteration,ttot,ttot2,ext_regi,emiMktExt) "parameter to save rescale factor across iterations for debugging purposes [%]"
p47_clampedRescaleSlope_iter(iteration,ttot,ttot2,ext_regi,emiMktExt) "auxiliary parameter to save the slope value before clamping. Useful for debugging purposes [#]"
p47_factorRescaleemiMktCO2TaxPreclamp_iter(iteration,ttot,ttot2,ext_regi,emiMktExt) "auxiliary parameter to save the rescale factor before clamping over iterations. Useful for debugging purposes []"
p47_dampedFactorRescaleemiMktCO2Tax_iter(iteration,ttot,ttot2,ext_regi,emiMktExt) "auxiliary parameter to save the rescale factor value before dampening. Useful for debugging purposes [#]"

*** Parameters necessary to define the CO2 tax curve shape
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13 changes: 7 additions & 6 deletions modules/47_regipol/regiCarbonPrice/postsolve.gms
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Expand Up @@ -328,11 +328,6 @@ loop(ext_regi$regiEmiMktTarget(ext_regi),
);
*** if we are still using the slope
if(NOT(regiEmiMktRescaleType(iteration,ttot,ttot2,ext_regi,emiMktExt,"squareDev_noNonPositiveSlope")),
*** clamp slopes values to avoid extreme changes (or no change) on a single iteration (avoid corner cases where other parts of the model changes causing undesirable fluctuations on the calculated slope)
if((p47_factorRescaleSlope(ttot,ttot2,ext_regi,emiMktExt) gt -0.3) OR (p47_factorRescaleSlope(ttot,ttot2,ext_regi,emiMktExt) lt -5),
p47_clampedRescaleSlope_iter(iteration,ttot,ttot2,ext_regi,emiMktExt) = p47_factorRescaleSlope(ttot,ttot2,ext_regi,emiMktExt);
);
p47_factorRescaleSlope(ttot,ttot2,ext_regi,emiMktExt) = max(-5,min(-0.3, p47_factorRescaleSlope(ttot,ttot2,ext_regi,emiMktExt)));
*** calculate the tax rescale factor using the above calculated slope
pm_factorRescaleemiMktCO2Tax(ttot,ttot2,ext_regi,emiMktExt) =
(
Expand All @@ -343,7 +338,13 @@ loop(ext_regi$regiEmiMktTarget(ext_regi),
);
);
);
);

*** clamp tax rescale refactor to [0.5 .. 2] to avoid extreme changes (or no change) on a single iteration (avoid corner cases where other parts of the model changes causing undesirable fluctuations on the calculated slope)
if( ( pm_factorRescaleemiMktCO2Tax(ttot,ttot2,ext_regi,emiMktExt) gt 2 ) OR ( pm_factorRescaleemiMktCO2Tax(ttot,ttot2,ext_regi,emiMktExt) lt 0.5 ) ,
p47_factorRescaleemiMktCO2TaxPreclamp_iter(ttot,ttot2,ext_regi,emiMktExt) = pm_factorRescaleemiMktCO2Tax(ttot,ttot2,ext_regi,emiMktExt);
pm_factorRescaleemiMktCO2Tax(ttot,ttot2,ext_regi,emiMktExt) = min(2, max( 0.5, pm_factorRescaleemiMktCO2Tax(ttot,ttot2,ext_regi,emiMktExt) ) );
);
);
*** dampen if rescale oscillates
if( (iteration.val > 3) ,
if ( (
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