switch to turn off future bioplastic demand

CHANGELOG.md

@@ -11,7 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - **module_documentation** all references to USD05 changed to USD17
 
 ### added
--
+- **62_material** added switch to turn off future material demand for bioplastic
 
 ### removed
 -

config/default.cfg

@@ -1941,11 +1941,16 @@ cfg$gms$material <- "exo_flexreg_apr16"
 # * defined by the maximum demand for bioplastics s62_max_dem_bioplastics
 # * (in mio. tonnes) and the midpoint s62_midpoint_dem_bioplastics (i.e.
 # * where bioplastic demand is half of the maximum demand).
-# * If maximum demand is 0, biomass demand for bioplastic production is not included.
+# * If s62_include_bioplastic is set to 0, future biomass demand for bioplastic
+# * production is not included. Otherwise, bioplastic demand is either kept
+# * constant at the value of 2020 (if s62_max_dem_bioplastics is set to 0)
+# * or follows a logistic curve with the specified maximum demand and
+# * midpoint (s62_midpoint_dem_bioplastic).
 # * Projected total plastic use in the "Global Ambiton" scneario of the OECD is
 # * about 600 mio. tonnes in 2050 -> E.g. 200 mio. tonnes in 2050 could be a
 # * reasonable (but ambitious) bioplastic scenario. With midpoint 2050 this
 # * would mean s62_max_dem_bioplastic = 400.
+cfg$gms$s62_include_bioplastic      <- 1                 # def = 1
 cfg$gms$s62_max_dem_bioplastic      <- 0                 # def = 0
 cfg$gms$s62_midpoint_dem_bioplastic <- 2050              # def = 2050
 

modules/62_material/exo_flexreg_apr16/input.gms

@@ -27,5 +27,6 @@ $offdelim
 /
 ;
 
+scalar s62_include_bioplastic switch whether future bioplastic demand should be included (0 or 1) / 1 /;
 scalar s62_max_dem_bioplastic maximum demand for bioplastics (mio. tDM per yr) / 0 /;
 scalar s62_midpoint_dem_bioplastic midpoint of logistic function for bioplastic demand (yr) / 2050 /;

modules/62_material/exo_flexreg_apr16/preloop.gms

@@ -9,9 +9,9 @@
  p62_dem_food_lastcalibyear(i) = 1;
  p62_dem_bioplastic(t,i) = 0;
 
-* Bioplastic demand is based on historic values up to 2020, and either kept constant for
-* future years, or following a logistic function with given midpoint and maximum if a 
-* bioplastic production target is exogenously set. 
+* Bioplastic demand is based on historic values up to 2020, and either set to zero for 
+* future years, kept constant at the value of 2020, or following a logistic function with 
+* given midpoint and maximum if a bioplastic production target is exogenously set. 
 * Global bioplastic demand is distributed to regions proportional to population due to lack of better data.
 
 p62_dem_bioplastic(t,i) = f62_hist_dem_bioplastic(t) * (im_pop(t,i) / sum(i2, im_pop(t,i2)));
@@ -22,5 +22,9 @@ if (s62_max_dem_bioplastic <> 0,
   p62_dem_bioplastic(t,i)$(m_year(t)>2020) = s62_max_dem_bioplastic / (1 + exp(-s62_growth_rate_bioplastic*(m_year(t)-s62_midpoint_dem_bioplastic))) * (im_pop(t,i) / sum(i2, im_pop(t,i2)));
 );
 
+if (s62_include_bioplastic = 0,
+  p62_dem_bioplastic(t,i)$(m_year(t)>2020) = 0;
+);
+
 * translate bioplastic demand to biomass demand using conversion factors between bioplastic and the different biomass sources
 p62_bioplastic_substrate(t,i,kall) = p62_dem_bioplastic(t,i) * f62_biomass2bioplastic_conversion_ratio(kall);

modules/62_material/exo_flexreg_apr16/presolve.gms

@@ -30,5 +30,9 @@ if (sum(sameas(t_past,t),1) = 1,
   p62_bioplastic_substrate_double_counted(t,i,kall) = p62_bioplastic_substrate(t,i,kall);
   p62_bioplastic_substrate_lastcalibyear(i,kall) = p62_bioplastic_substrate(t,i,kall);
 else
-  p62_bioplastic_substrate_double_counted(t,i,kall) = p62_bioplastic_substrate_lastcalibyear(i,kall) * p62_scaling_factor(i);
+  if (s62_include_bioplastic = 0,
+    p62_bioplastic_substrate_double_counted(t,i,kall) = 0;
+  else
+    p62_bioplastic_substrate_double_counted(t,i,kall) = p62_bioplastic_substrate_lastcalibyear(i,kall) * p62_scaling_factor(i);
+  );
 );