diff --git a/process/core/solver/iteration_variables.py b/process/core/solver/iteration_variables.py
index 8e0de61362..917fd193a9 100644
--- a/process/core/solver/iteration_variables.py
+++ b/process/core/solver/iteration_variables.py
@@ -230,6 +230,7 @@ class IterationVariable:
     174: IterationVariable("triang", "physics", 0.00, 1.00),
     175: IterationVariable("kappa", "physics", 0.00, 10.00),
     176: IterationVariable("f_st_coil_aspect", "stellarator", 0.70, 1.30),
+    177: IterationVariable("f_a_tf_turn_cable_space_extra_void", "tfcoil", 0.01, 1.0),
 }
 
 
diff --git a/process/models/stellarator/build.py b/process/models/stellarator/build.py
index 62897c834f..3b9deffa41 100644
--- a/process/models/stellarator/build.py
+++ b/process/models/stellarator/build.py
@@ -197,6 +197,12 @@ def output(stellarator, data):
         "(required_radial_space)",
         data.build.required_radial_space,
     )
+    po.ovarre(
+        stellarator.outfile,
+        "Normalized plasma-coil distance",
+        "(f_dr_plasma_coil_normalized)",
+        data.build.available_radial_space / data.physics.rminor,
+    )
 
     radius = 0.0e0
     po.obuild(stellarator.outfile, "Device centreline", 0.0e0, radius)