diff --git a/process/costs_2015.py b/process/costs_2015.py
index ce62516a..ccb1a5d4 100644
--- a/process/costs_2015.py
+++ b/process/costs_2015.py
@@ -173,7 +173,7 @@ def run(self):
         if (abs(cost_variables.concost) > 9.99e99) or (
             cost_variables.concost != cost_variables.concost
         ):
-            self.write_costs_to_output()
+            self.output()
 
             for i in range(100):
                 # noqa: E741
diff --git a/process/main.py b/process/main.py
index f1423dcc..235e13c6 100644
--- a/process/main.py
+++ b/process/main.py
@@ -583,7 +583,7 @@ def __init__(self):
         This also initialises module variables in the Fortran for that module.
         """
         self._costs_custom = None
-        self._costs_old = Costs()
+        self._costs_1990 = Costs()
         self._costs_2015 = Costs2015()
         self.cs_fatigue = CsFatigue()
         self.pfcoil = PFCoil(cs_fatigue=self.cs_fatigue)
@@ -623,7 +623,7 @@ def __init__(self):
     @property
     def costs(self) -> CostsProtocol:
         if fortran.cost_variables.cost_model == 0:
-            return self._costs_old
+            return self._costs_1990
         if fortran.cost_variables.cost_model == 1:
             return self._costs_2015
         if fortran.cost_variables.cost_model == 2:
diff --git a/process/output.py b/process/output.py
index 8214e7cc..71f60f9d 100644
--- a/process/output.py
+++ b/process/output.py
@@ -34,6 +34,7 @@ def write(models, outfile):
     # 0    |  1990 costs model
     # 1    |  2015 Kovari model
     # 2    |  Custom model
+    models.costs.run()
     models.costs.output()
 
     # Availability model