diff --git a/modules/35_transport/edge_esm/bounds.gms b/modules/35_transport/edge_esm/bounds.gms
index e62d04d9aa0f96d1612e82d8909a169fc37fde38..7dd58d1e9c44c4465d948c484692319cca4d866f 100644
--- a/modules/35_transport/edge_esm/bounds.gms
+++ b/modules/35_transport/edge_esm/bounds.gms
@@ -5,9 +5,15 @@
 *** |  REMIND License Exception, version 1.0 (see LICENSE file).
 *** |  Contact: remind@pik-potsdam.de
 *** SOF ./modules/35_transport/edge_esm/bounds.gms
+
+* Specify amount of syn- and biofuels to be used in transport
 vm_shBioFe.lo(t,regi)$(t.val > 2020) = 0.1;
 vm_shBioFe.lo(t,regi)$(t.val > 2025) = 0.2;
 vm_shBioFe.lo(t,regi)$(t.val > 2030) = 0.3;
 
+vm_shSynSe.lo(t,regi)$(t.val > 2020) = 0.1;
+vm_shSynSe.lo(t,regi)$(t.val > 2025) = 0.2;
+vm_shSynSe.lo(t,regi)$(t.val > 2030) = 0.4;
+
 * vm_cesIO.up(t,regi,ppfen_dyn35)$(t.val > 2020) = p35_demLimit(t,regi,"gdp_SSP2","Smart_lifestyles_Electricity_push",ppfen_dyn35);
 *** EOF ./modules/35_transport/edge_esm/bounds.gms
diff --git a/modules/35_transport/edge_esm/declarations.gms b/modules/35_transport/edge_esm/declarations.gms
index 4827f6d73b2fda9d825e2e69f5846daedc43cbea..ba00f04b5b1412c4d996d034c3ce9f8de211ec3c 100644
--- a/modules/35_transport/edge_esm/declarations.gms
+++ b/modules/35_transport/edge_esm/declarations.gms
@@ -6,10 +6,12 @@
 *** |  Contact: remind@pik-potsdam.de
 *** SOF ./modules/35_transport/edge_esm/declarations.gms
 Positive variables
-vm_shBioFe(ttot,all_regi) "Share of biofuels in all final energies used for transportation. Value between 0 and 1."
+vm_shBioFe(ttot,all_regi)   "Share of biofuels in all final energies used for transportation. Value between 0 and 1."
+vm_shSynSe(ttot,all_regi)   "Share of synthetic liquids in all fossil liquids. Value between 0 and 1."
 ;
 
 Equations
-q35_shBioFe(ttot,all_regi) "Define the share of biofuels in all final energies for transportation."
+q35_shBioFe(ttot,all_regi)  "Define the share of biofuels in all final energies for transportation."
+q35_shSynSe(ttot,all_regi)  "Define share of synthetic liquids in all fossil liquids."
 ;
 *** EOF ./modules/35_transport/edge_esm/declarations.gms
diff --git a/modules/35_transport/edge_esm/equations.gms b/modules/35_transport/edge_esm/equations.gms
index 9095bba04077ce88f70f77efabb3346a2021e09f..1da2e84ec49c50f7c75f076f2d8abe84b09bab61 100644
--- a/modules/35_transport/edge_esm/equations.gms
+++ b/modules/35_transport/edge_esm/equations.gms
@@ -6,10 +6,30 @@
 *** |  Contact: remind@pik-potsdam.de
 *** SOF ./modules/35_transport/edge_esm/equations.gms
 
+***---------------------------------------------------------------------------
+*** Share of biofuels in transport liquids
+***---------------------------------------------------------------------------
+
 q35_shBioFe(t,regi)..
   sum(se2fe(entySe,fe_with_bio_dyn35,te), vm_prodFe(t,regi,entySe,fe_with_bio_dyn35,te) )
   * vm_shBioFe(t,regi)
   =e=
   sum(se2fe(se_with_bio_dyn35,fe_with_bio_dyn35,te), vm_prodFe(t,regi,se_with_bio_dyn35,fe_with_bio_dyn35,te) )
 ;
+
+***---------------------------------------------------------------------------
+*** Share of synfuels in transport liquids, only applicable if CCU module is used
+***---------------------------------------------------------------------------
+
+$ifthen.ccu %CCU% == "on"
+q35_shSynSe(t,regi)..
+  (
+      sum(se2fe(entySe,"fepet",te), vm_prodFe(t,regi,entySe,"fepet",te) ) +
+      sum(se2fe(entySe,"fedie",te), vm_prodFe(t,regi,entySe,"fedie",te) )
+  ) * vm_shSynSe(t,regi)
+  =e=
+  vm_prodSe(t,regi,"seh2","seliqfos","MeOH")
+;
+$endif.ccu
+
 *** EOF ./modules/35_transport/edge_esm/equations.gms
diff --git a/modules/39_CCU/on/bounds.gms b/modules/39_CCU/on/bounds.gms
index b1748a44d3e834c44b89db200c4c3b5aa2ee6726..f9cbed4d405e3ddb1bc75443de73aa555aca0cd8 100644
--- a/modules/39_CCU/on/bounds.gms
+++ b/modules/39_CCU/on/bounds.gms
@@ -46,9 +46,5 @@ vm_co2capture.up(t,regi,"cco2","ico2","ccsinje","1") = 50;
 *** vm_prodSe.lo("2060","SSA",enty,"segafos",te) = 1;
 *** vm_prodSe.lo("2060","USA",enty,"segafos",te) = 0.5;
 
-vm_shSynSe.lo(t,regi)$(t.val > 2020) = 0.1;
-vm_shSynSe.lo(t,regi)$(t.val > 2025) = 0.2;
-vm_shSynSe.lo(t,regi)$(t.val > 2030) = 0.4;
-
 
 *** EOF ./modules/39_CCU/39_CCU.gms
diff --git a/modules/39_CCU/on/declarations.gms b/modules/39_CCU/on/declarations.gms
index 0f0f09431d04b60fdfe5aed51036a2855721df22..bdf2fd85608c28f0221141be49d84ff8c8cfbf4a 100644
--- a/modules/39_CCU/on/declarations.gms
+++ b/modules/39_CCU/on/declarations.gms
@@ -25,8 +25,6 @@ p39_ratioCtoH(tall,all_regi,all_enty,all_enty,all_te,all_enty)         "ratio be
 
 positive variables
 vm_co2CCUshort(ttot,all_regi,all_enty,all_enty,all_te,rlf)           "CO2 captured in CCU te that have a persistence for co2 storage shorter than 5 years. Unit GtC/a"
-
-vm_shSynSe(ttot,all_regi)          "Share of synthetic liquids in all fossil liquids. Value between 0 and 1."
 ;
 
 
@@ -38,8 +36,6 @@ vm_shSynSe(ttot,all_regi)          "Share of synthetic liquids in all fossil liq
 
 equations
 q39_emiCCU(ttot,all_regi)                                               "Managing the C/H ratio in CCU-Technologies"
-
-q39_shSynSe(ttot,all_regi)                    "Define share of synthetic liquids in all fossil liquids."
 ;
 
 *** EOF ./modules/39_CCU/on/declarations.gms
diff --git a/modules/39_CCU/on/equations.gms b/modules/39_CCU/on/equations.gms
index 7153ef5985dd28debd275f419942f50e792c2e5b..b0e053592076096d6ab5166806d2bf6739d2fc2e 100644
--- a/modules/39_CCU/on/equations.gms
+++ b/modules/39_CCU/on/equations.gms
@@ -23,13 +23,5 @@ q39_emiCCU(t,regi) ..
   )
 ;
 
-q39_shSynSe(t,regi)..
-  (
-      sum(se2fe(entySe,"fepet",te), vm_prodFe(t,regi,entySe,"fepet",te) ) +
-      sum(se2fe(entySe,"fedie",te), vm_prodFe(t,regi,entySe,"fedie",te) )
-  ) * vm_shSynSe(t,regi)
-  =e=
-  vm_prodSe(t,regi,"seh2","seliqfos","MeOH")
-;
 
 *** EOF ./modules/39_CCU/on/equations.gms