diff --git a/documentation/source/fusion-devices/stellarator.md b/documentation/source/fusion-devices/stellarator.md
index 30a4e4a6bf..0ba7b487e2 100644
--- a/documentation/source/fusion-devices/stellarator.md
+++ b/documentation/source/fusion-devices/stellarator.md
@@ -223,7 +223,7 @@ A reasonable set of input parameters for the stellarator coil module is the foll
 i_tf_sc_mat = 8 * Switch for superconductor material in tf coils;
 sig_tf_wp_max = 4.e8 * Maximal allowable Stress level on Ground insulation for a simple stellarator coil stress module (Pa)
 f_a_tf_turn_cable_copper = 0.7 *Copper fraction of cable conductor (TF coils), Schauer: 900 SCU strands, 522 Copper strands. Value for 0.4 Helium
-tftmp = 4.75 *Peak helium coolant temperature in TF coils and PF coils (K)
+temp_tf_operating = 4.75 *Peak helium coolant temperature in TF coils and PF coils (K)
 temp_tf_cryo = 4.75 * Temperature in TF coils, required for plant efficiency (K)
 f_a_tf_turn_cable_space_extra_void = 0.3 *Coolant fraction of TF coil leg (itfsup=0) this is the same for conductor and strand!
 f_j_tf_wp_critical_max = 0.78 * Fraction TF coil critical current to operation current (constraint margin)
diff --git a/examples/data/large_tokamak_IN.DAT b/examples/data/large_tokamak_IN.DAT
index cc19dd2588..900cd37977 100644
--- a/examples/data/large_tokamak_IN.DAT
+++ b/examples/data/large_tokamak_IN.DAT
@@ -557,7 +557,7 @@ dx_tf_wp_insulation = 0.008
 dia_tf_turn_coolant_channel = 0.01
 
 * Helium coolant temperature [K]
-tftmp = 4.75
+temp_tf_operating = 4.75
 
 * Coolant fraction of TF cable [-]
 f_a_tf_turn_cable_space_extra_void = 0.3
diff --git a/examples/data/large_tokamak_eval_IN.DAT b/examples/data/large_tokamak_eval_IN.DAT
index 4d1db75a9f..2b3fd57df1 100644
--- a/examples/data/large_tokamak_eval_IN.DAT
+++ b/examples/data/large_tokamak_eval_IN.DAT
@@ -377,7 +377,7 @@ i_tf_sc_mat = 1 * Switch for superconductor material in TF coils;
 ripple_b_tf_plasma_edge_max   = 0.6 * maximum allowable toroidal field ripple amplitude at plasma edge (%)
 t_tf_superconductor_quench   = 17.97282589344206 * fast discharge time for TF coil in event of quench (s) (`iteration variable 56`)
 n_tf_coils     = 16 * Number of TF coils (default = 50 for stellarators); Number of TF coils outer legs for ST
-tftmp    = 4.75 * peak helium coolant temperature in TF coils and PF coils (K)
+temp_tf_operating    = 4.75 * peak helium coolant temperature in TF coils and PF coils (K)
 dr_tf_nose_case   = 0.2816873221155309 * inboard TF coil case outer (non-plasma side) thickness (m) (`iteration variable 57`)
 dr_tf_wp_with_insulation = 0.5153787768966674 * radial thickness of winding pack (m) (issue #514)
 dx_tf_turn_steel = 0.008012110032981922 * TF coil conduit case thickness (m) (`iteration variable 58`)
diff --git a/examples/data/large_tokamak_varied_min_net_electric_IN.DAT b/examples/data/large_tokamak_varied_min_net_electric_IN.DAT
index 432d68ae6e..e4ae9af9ba 100644
--- a/examples/data/large_tokamak_varied_min_net_electric_IN.DAT
+++ b/examples/data/large_tokamak_varied_min_net_electric_IN.DAT
@@ -561,7 +561,7 @@ dx_tf_wp_insulation = 0.008
 dia_tf_turn_coolant_channel = 0.01
 
 * Helium coolant temperature [K]
-tftmp = 4.75
+temp_tf_operating = 4.75
 
 * Coolant fraction of TF cable [-]
 f_a_tf_turn_cable_space_extra_void = 0.3
diff --git a/examples/data/large_tokamak_varyrun_IN.DAT b/examples/data/large_tokamak_varyrun_IN.DAT
index 75e2a2759f..97c578c255 100644
--- a/examples/data/large_tokamak_varyrun_IN.DAT
+++ b/examples/data/large_tokamak_varyrun_IN.DAT
@@ -562,7 +562,7 @@ dx_tf_wp_insulation = 0.008
 dia_tf_turn_coolant_channel = 0.01
 
 * Helium coolant temperature [K]
-tftmp = 4.75
+temp_tf_operating = 4.75
 
 * Coolant fraction of TF cable [-]
 f_a_tf_turn_cable_space_extra_void = 0.3
diff --git a/examples/data/scan_example_file_IN.DAT b/examples/data/scan_example_file_IN.DAT
index 323c0321ca..732a770227 100644
--- a/examples/data/scan_example_file_IN.DAT
+++ b/examples/data/scan_example_file_IN.DAT
@@ -567,7 +567,7 @@ dx_tf_wp_insulation = 0.008
 dia_tf_turn_coolant_channel = 0.01
 
 * Helium coolant temperature [K]
-tftmp = 4.75
+temp_tf_operating = 4.75
 
 * Coolant fraction of TF cable [-]
 f_a_tf_turn_cable_space_extra_void = 0.3
diff --git a/process/core/data_structure/obsolete_vars.py b/process/core/data_structure/obsolete_vars.py
index 78b331d72f..271100841d 100644
--- a/process/core/data_structure/obsolete_vars.py
+++ b/process/core/data_structure/obsolete_vars.py
@@ -482,6 +482,7 @@
     "temp_plasma_pedestal_kev": "temp_plasma_pedestal_electron_kev",
     "temp_plasma_separatrix_kev": "temp_plasma_separatrix_electron_kev",
     "iohcl": "i_cs_use",
+    "tftmp": "temp_tf_operating",
 }
 
 OBS_VARS_HELP = {
diff --git a/process/core/init.py b/process/core/init.py
index 922a360825..cd2ceb5533 100644
--- a/process/core/init.py
+++ b/process/core/init.py
@@ -1179,10 +1179,10 @@ def check_process(inputs, data):  # noqa: ARG001
     if (
         SuperconductorModel(data.tfcoil.i_tf_sc_mat).sc_type
         == SuperconductorType.LOW_TEMPERATURE
-        and data.tfcoil.tftmp > 10.0
+        and data.tfcoil.temp_tf_operating > 10.0
     ):
         raise ProcessValidationError(
-            "The LTS conductor temperature (tftmp) has to be lower than 10"
+            "The LTS conductor temperature (temp_tf_operating) has to be lower than 10"
         )
 
     # PF coil resistivity is zero if superconducting
@@ -1310,8 +1310,10 @@ def check_process(inputs, data):  # noqa: ARG001
         )
 
     # Cold end of the cryocooler should be colder than the TF
-    if data.tfcoil.temp_tf_cryo > data.tfcoil.tftmp:
-        raise ProcessValidationError("temp_tf_cryo should be lower than tftmp")
+    if data.tfcoil.temp_tf_cryo > data.tfcoil.temp_tf_operating:
+        raise ProcessValidationError(
+            "temp_tf_cryo should be lower than temp_tf_operating"
+        )
 
     # Cannot use TF coil strain limit if i_str_wp is off:
     if (
diff --git a/process/core/input.py b/process/core/input.py
index c288a0fc58..b00bf16b65 100644
--- a/process/core/input.py
+++ b/process/core/input.py
@@ -833,7 +833,7 @@ def bounds(self) -> tuple[NumberType | None, NumberType | None]:
     "tfcbv": InputVariable("buildings", float, range=(10000.0, 1000000.0)),
     "dx_tf_wp_insertion_gap": InputVariable("tfcoil", float, range=(1e-10, 0.1)),
     "f_dr_tf_outboard_inboard": InputVariable("build", float, range=(0.2, 5.0)),
-    "tftmp": InputVariable("tfcoil", float, range=(0.01, 293.0)),
+    "temp_tf_operating": InputVariable("tfcoil", float, range=(0.01, 293.0)),
     "temp_cs_superconductor_operating": InputVariable(
         "pf_coil", float, range=(0.01, 293.0)
     ),
diff --git a/process/core/io/mfile/comparison.py b/process/core/io/mfile/comparison.py
index c5577cda73..a444b30f5e 100644
--- a/process/core/io/mfile/comparison.py
+++ b/process/core/io/mfile/comparison.py
@@ -181,7 +181,7 @@
     "b_tf_inboard_peak_symmetric",
     "iooic",
     "tmarg",
-    "tftmp",
+    "temp_tf_operating",
     "qtarget",
     "qtargetcomplete",
     "totalpowerlost",
diff --git a/process/core/io/plot/summary/api.py b/process/core/io/plot/summary/api.py
index b5e807ec71..3b85019ce3 100644
--- a/process/core/io/plot/summary/api.py
+++ b/process/core/io/plot/summary/api.py
@@ -647,7 +647,7 @@ def _add_page(name: str | None = None):
                 f_a_cable_space_helium=m_file.get(
                     "f_a_tf_turn_cable_space_cooling", scan=scan
                 ),
-                temp_he_peak=m_file.get("tftmp", scan=scan),
+                temp_he_peak=m_file.get("temp_tf_operating", scan=scan),
                 temp_quench_max=m_file.get("temp_tf_conductor_quench_max", scan=scan),
                 cu_rrr=m_file.get("rrr_tf_cu", scan=scan),
                 t_quench_detection=m_file.get("t_tf_quench_detection", scan=scan),
diff --git a/process/core/io/plot/summary/magnets/tf.py b/process/core/io/plot/summary/magnets/tf.py
index e500550f05..78f0ce000b 100644
--- a/process/core/io/plot/summary/magnets/tf.py
+++ b/process/core/io/plot/summary/magnets/tf.py
@@ -1958,7 +1958,7 @@ def _pack_strands_rectangular_with_obstacles(
         f" {mfile.get('b_tf_superconductor_critical_zero_temp_strain', scan=scan):.4f}"
         " T\nCritical temperature at\nzero field and strain:"
         f" {mfile.get('temp_tf_superconductor_critical_zero_field_strain', scan=scan):.4f}"  # noqa: E501
-        f" K\nTemperature at conductor: {mfile.get('tftmp', scan=scan):.4f}"
+        f" K\nTemperature at conductor: {mfile.get('temp_tf_operating', scan=scan):.4f}"
         " K\nField at conductor:"
         f" {mfile.get('b_tf_inboard_peak_with_ripple', scan=scan):.4f}"
         " T\nSuperconductor critical current density at\noperating"
@@ -2196,7 +2196,7 @@ def plot_tf_croco_turn(axis: plt.Axes, fig, mfile: MFile, scan: int):
         f" {mfile.get('b_tf_superconductor_critical_zero_temp_strain', scan=scan):.4f}"
         " T\nCritical temperature at\nzero field and strain:"
         f" {mfile.get('temp_tf_superconductor_critical_zero_field_strain', scan=scan):.4f}"  # noqa: E501
-        f" K\nTemperature at conductor: {mfile.get('tftmp', scan=scan):.4f}"
+        f" K\nTemperature at conductor: {mfile.get('temp_tf_operating', scan=scan):.4f}"
         " K\nField at conductor:"
         f" {mfile.get('b_tf_inboard_peak_with_ripple', scan=scan):.4f}"
         " T\nSuperconductor critical current density at\noperating"
diff --git a/process/data_structure/tfcoil_variables.py b/process/data_structure/tfcoil_variables.py
index 1e9bdb5a55..86566f757b 100644
--- a/process/data_structure/tfcoil_variables.py
+++ b/process/data_structure/tfcoil_variables.py
@@ -628,8 +628,8 @@ class TFData:
     tfsao: float = 0.0
     """area of the outboard TF coil legs (m2)"""
 
-    tftmp: float = 4.5
-    """peak helium coolant temperature in TF coils and PF coils (K)"""
+    temp_tf_operating: float = 4.5
+    """Operating temperature of the TF coil [K]"""
 
     dx_tf_inboard_out_toroidal: float = 1.0
     """Inboard leg toroidal thickness at outer edge (m)"""
diff --git a/process/models/pfcoil.py b/process/models/pfcoil.py
index 3f0be2c320..2b3e4da4d4 100644
--- a/process/models/pfcoil.py
+++ b/process/models/pfcoil.py
@@ -897,7 +897,7 @@ def pfcoil(self):
                             isumat=self.data.pf_coil.i_pf_superconductor,
                             fhts=self.data.tfcoil.fhts,
                             strain=self.data.tfcoil.str_pf_con_res,
-                            temp_pf_peak_field=self.data.tfcoil.tftmp,
+                            temp_pf_peak_field=self.data.tfcoil.temp_tf_operating,
                             bcritsc=self.data.tfcoil.bcritsc,
                             tcritsc=self.data.tfcoil.tcritsc,
                             dr_hts_tape=self.data.superconducting_tfcoil.dr_tf_hts_tape,
diff --git a/process/models/stellarator/coils/calculate.py b/process/models/stellarator/coils/calculate.py
index 151e34abc5..0104529d3c 100644
--- a/process/models/stellarator/coils/calculate.py
+++ b/process/models/stellarator/coils/calculate.py
@@ -417,7 +417,7 @@ def winding_pack_total_size(
         # jcrit for this bmax:
         jcrit_vector[k] = jcrit_from_material(
             b_max_k[k],
-            data.tfcoil.tftmp + data.tfcoil.tmargmin,
+            data.tfcoil.temp_tf_operating + data.tfcoil.tmargmin,
             data.tfcoil.i_tf_sc_mat,
             data.tfcoil.bcritsc,
             data.tfcoil.f_a_tf_turn_cable_copper,
diff --git a/process/models/stellarator/coils/quench.py b/process/models/stellarator/coils/quench.py
index 1b0c1b1667..b8894bc749 100644
--- a/process/models/stellarator/coils/quench.py
+++ b/process/models/stellarator/coils/quench.py
@@ -61,7 +61,7 @@ def calculate_quench_protection(coilcurrent, data: DataStructure):
         t_detect=data.tfcoil.t_tf_quench_detection,
         f_cu=data.tfcoil.f_a_tf_turn_cable_copper,
         f_cond=1 - data.tfcoil.f_a_tf_turn_cable_space_extra_void,
-        temp=data.tfcoil.tftmp,
+        temp=data.tfcoil.temp_tf_operating,
         a_cable=data.tfcoil.a_tf_turn_cable_space_no_void,
         a_turn=data.tfcoil.dx_tf_turn_general**2,
     )
diff --git a/process/models/tfcoil/superconducting.py b/process/models/tfcoil/superconducting.py
index 34fcfa3d97..009ba7f86f 100644
--- a/process/models/tfcoil/superconducting.py
+++ b/process/models/tfcoil/superconducting.py
@@ -974,8 +974,8 @@ def output_tf_superconductor_info(self):
         po.ovarre(
             self.outfile,
             "TF coil temperature at peak field (K)",
-            "(tftmp)",
-            self.data.tfcoil.tftmp,
+            "(temp_tf_operating)",
+            self.data.tfcoil.temp_tf_operating,
         )
         po.ovarre(
             self.outfile,
@@ -2720,7 +2720,7 @@ def run(self, output: bool = False):
                 j_tf_wp=self.data.tfcoil.j_tf_wp,
                 i_tf_superconductor=self.data.tfcoil.i_tf_sc_mat,
                 f_strain_scale=self.data.tfcoil.fhts,
-                temp_tf_coolant_peak_field=self.data.tfcoil.tftmp,
+                temp_tf_coolant_peak_field=self.data.tfcoil.temp_tf_operating,
                 bcritsc=self.data.tfcoil.bcritsc,
                 tcritsc=self.data.tfcoil.tcritsc,
                 data=self.data,
@@ -2760,7 +2760,7 @@ def run(self, output: bool = False):
                 bc20m=d_sc_tf.b_tf_superconductor_critical_zero_temp_strain,
                 tc0m=d_sc_tf.temp_tf_superconductor_critical_zero_field_strain,
                 c0=1.0e10,
-                temp_tf_coolant_peak_field=self.data.tfcoil.tftmp,
+                temp_tf_coolant_peak_field=self.data.tfcoil.temp_tf_operating,
                 data=self.data,
             )
         )
@@ -2786,7 +2786,7 @@ def run(self, output: bool = False):
                 t_tf_quench_dump=self.data.tfcoil.t_tf_superconductor_quench,
                 f_a_tf_turn_cable_copper=self.data.tfcoil.f_a_tf_turn_cable_copper,
                 f_a_tf_turn_cable_space_cooling=d_sc_tf.f_a_tf_turn_cable_space_cooling,
-                temp_tf_coolant_peak_field=self.data.tfcoil.tftmp,
+                temp_tf_coolant_peak_field=self.data.tfcoil.temp_tf_operating,
                 temp_tf_conductor_quench_max=self.data.tfcoil.temp_tf_conductor_quench_max,
                 b_tf_inboard_peak=self.data.tfcoil.b_tf_inboard_peak_with_ripple,
                 cu_rrr=self.data.tfcoil.rrr_tf_cu,
@@ -3991,7 +3991,7 @@ def run(self, output: bool = False):
             a_tf_turn=self.data.tfcoil.a_tf_turn,
             b_tf_inboard_peak=self.data.tfcoil.b_tf_inboard_peak_with_ripple,
             cur_tf_turn=self.data.tfcoil.c_tf_turn,
-            temp_tf_peak=self.data.tfcoil.tftmp,
+            temp_tf_peak=self.data.tfcoil.temp_tf_operating,
             i_tf_superconductor=self.data.tfcoil.i_tf_sc_mat,
             dr_tf_hts_tape=d_sc_tf.dr_tf_hts_tape,
             dx_tf_hts_tape_rebco=d_sc_tf.dx_tf_hts_tape_rebco,
@@ -4035,7 +4035,7 @@ def run(self, output: bool = False):
                 bc20m=d_sc_tf.b_tf_superconductor_critical_zero_temp_strain,
                 tc0m=d_sc_tf.temp_tf_superconductor_critical_zero_field_strain,
                 c0=1.0e10,
-                temp_tf_coolant_peak_field=self.data.tfcoil.tftmp,
+                temp_tf_coolant_peak_field=self.data.tfcoil.temp_tf_operating,
                 data=self.data,
             )
         )
@@ -4249,7 +4249,7 @@ def run(self, output: bool = False):
                 t_tf_quench_dump=self.data.tfcoil.t_tf_superconductor_quench,
                 f_a_tf_turn_cable_space_cooling=d_sc_tf.f_a_tf_turn_cable_space_cooling,
                 f_a_tf_turn_cable_copper=self.data.tfcoil.f_a_tf_turn_cable_copper,
-                temp_tf_coolant_peak_field=self.data.tfcoil.tftmp,
+                temp_tf_coolant_peak_field=self.data.tfcoil.temp_tf_operating,
                 temp_tf_conductor_quench_max=self.data.tfcoil.temp_tf_conductor_quench_max,
                 b_tf_inboard_peak=self.data.tfcoil.b_tf_inboard_peak_with_ripple,
                 cu_rrr=self.data.tfcoil.rrr_tf_cu,
diff --git a/tests/integration/data/large_tokamak_IN.DAT b/tests/integration/data/large_tokamak_IN.DAT
index 16230592e5..7eb764a9bd 100644
--- a/tests/integration/data/large_tokamak_IN.DAT
+++ b/tests/integration/data/large_tokamak_IN.DAT
@@ -561,7 +561,7 @@ dx_tf_wp_insulation = 0.008
 dia_tf_turn_coolant_channel = 0.01
 
 * Helium coolant temperature [K]
-tftmp = 4.75
+temp_tf_operating = 4.75
 
 * Coolant fraction of TF cable [-]
 f_a_tf_turn_cable_space_extra_void = 0.3
diff --git a/tests/integration/data/large_tokamak_eval.IN.DAT b/tests/integration/data/large_tokamak_eval.IN.DAT
index 29ccd473a4..da81aaf4a1 100644
--- a/tests/integration/data/large_tokamak_eval.IN.DAT
+++ b/tests/integration/data/large_tokamak_eval.IN.DAT
@@ -373,7 +373,7 @@ i_tf_sc_mat = 1 * Switch for superconductor material in TF coils;
 ripple_b_tf_plasma_edge_max   = 0.6 * maximum allowable toroidal field ripple amplitude at plasma edge (%)
 t_tf_superconductor_quench   = 17.97282589344206 * fast discharge time for TF coil in event of quench (s) (`iteration variable 56`)
 n_tf_coils     = 16 * Number of TF coils (default = 50 for stellarators); Number of TF coils outer legs for ST
-tftmp    = 4.75 * peak helium coolant temperature in TF coils and PF coils (K)
+temp_tf_operating    = 4.75 * peak helium coolant temperature in TF coils and PF coils (K)
 dr_tf_nose_case   = 0.2816873221155309 * inboard TF coil case outer (non-plasma side) thickness (m) (`iteration variable 57`)
 dr_tf_wp_with_insulation = 0.5153787768966674 * radial thickness of winding pack (m) (issue #514)
 dx_tf_turn_steel = 0.008012110032981922 * TF coil conduit case thickness (m) (`iteration variable 58`)
diff --git a/tests/regression/input_files/helias_5b.IN.DAT b/tests/regression/input_files/helias_5b.IN.DAT
index c364f1b694..ee71578696 100644
--- a/tests/regression/input_files/helias_5b.IN.DAT
+++ b/tests/regression/input_files/helias_5b.IN.DAT
@@ -163,7 +163,7 @@ runtitle = HELIAS-5B
 
 f_a_tf_turn_cable_copper  = 0.69         *Copper fraction of cable conductor (TF coils)
 i_tf_sc_mat = 1         *Switch for superconductor material in tf coils (1: ITER Nb3Sn)
-tftmp     = 4.2         *Peak helium coolant temperature in TF coils and PF coils (k)
+temp_tf_operating     = 4.2         *Peak helium coolant temperature in TF coils and PF coils (k)
 temp_tf_cryo    = 4.2         *Coil temperature for cryogenic plant power calculation (K)
 dx_tf_turn_general = 0.056       *Dimension conductor area including steel and insulation.
 dx_tf_turn_insulation  = 0.002       *Conduit insulation thickness (m)
diff --git a/tests/regression/input_files/large_tokamak_eval.IN.DAT b/tests/regression/input_files/large_tokamak_eval.IN.DAT
index d9128b7218..2980495ab4 100644
--- a/tests/regression/input_files/large_tokamak_eval.IN.DAT
+++ b/tests/regression/input_files/large_tokamak_eval.IN.DAT
@@ -376,7 +376,7 @@ i_tf_sc_mat = 1 * Switch for superconductor material in TF coils;
 ripple_b_tf_plasma_edge_max   = 0.6 * maximum allowable toroidal field ripple amplitude at plasma edge (%)
 t_tf_superconductor_quench   = 17.97282589344206 * fast discharge time for TF coil in event of quench (s) (`iteration variable 56`)
 n_tf_coils     = 16 * Number of TF coils (default = 50 for stellarators); Number of TF coils outer legs for ST
-tftmp    = 4.75 * peak helium coolant temperature in TF coils and PF coils (K)
+temp_tf_operating    = 4.75 * peak helium coolant temperature in TF coils and PF coils (K)
 dr_tf_nose_case   = 0.2816873221155309 * inboard TF coil case outer (non-plasma side) thickness (m) (`iteration variable 57`)
 dr_tf_wp_with_insulation = 0.5153787768966674 * radial thickness of winding pack (m) (issue #514)
 dx_tf_turn_steel = 0.008012110032981922 * TF coil conduit case thickness (m) (`iteration variable 58`)
diff --git a/tests/regression/input_files/large_tokamak_nof.IN.DAT b/tests/regression/input_files/large_tokamak_nof.IN.DAT
index 203363dad0..f16a487f5f 100644
--- a/tests/regression/input_files/large_tokamak_nof.IN.DAT
+++ b/tests/regression/input_files/large_tokamak_nof.IN.DAT
@@ -570,7 +570,7 @@ dx_tf_wp_insulation = 0.008
 dia_tf_turn_coolant_channel = 0.01
 
 * Helium coolant temperature [K]
-tftmp = 4.75
+temp_tf_operating = 4.75
 
 * Coolant fraction of TF cable [-]
 f_a_tf_turn_cable_space_extra_void = 0.3
diff --git a/tests/regression/input_files/low_aspect_ratio_DEMO.IN.DAT b/tests/regression/input_files/low_aspect_ratio_DEMO.IN.DAT
index af4872e2a9..b5ec0dcc86 100644
--- a/tests/regression/input_files/low_aspect_ratio_DEMO.IN.DAT
+++ b/tests/regression/input_files/low_aspect_ratio_DEMO.IN.DAT
@@ -928,7 +928,7 @@ dia_tf_turn_coolant_channel = 0.010
 * DESCRIPTION:   diameter of He coil in TF winding (m)
 * JUSTIFICATION: 
 
-tftmp = 4.750
+temp_tf_operating = 4.750
 * DESCRIPTION:   Peak helium coolant temperature in tf coils and pf coils (k)
 * JUSTIFICATION: 
 
diff --git a/tests/regression/input_files/spherical_tokamak_eval.IN.DAT b/tests/regression/input_files/spherical_tokamak_eval.IN.DAT
index 55d139b8c0..9e917d4502 100644
--- a/tests/regression/input_files/spherical_tokamak_eval.IN.DAT
+++ b/tests/regression/input_files/spherical_tokamak_eval.IN.DAT
@@ -358,7 +358,7 @@ eyoung_res_tf_buck = 205.0e9 * Resistive TF magnets bucking cylinder young modul
 ripple_b_tf_plasma_edge_max   = 1.0 * maximum allowable toroidal field ripple amplitude at plasma edge (%)
 i_cp_joints = 0 * Switch for CP demoutable joints type
 n_tf_coils     = 12 * Number of TF coils (default = 50 for stellarators); Number of TF coils outer legs for ST
-tftmp    = 20.0 * peak helium coolant temperature in TF coils and PF coils (K)
+temp_tf_operating    = 20.0 * peak helium coolant temperature in TF coils and PF coils (K)
 dr_tf_nose_case   = 0.1293140904093427 * inboard TF coil case outer (non-plasma side) thickness (m) (`iteration variable 57`)
 dr_tf_wp_with_insulation = 0.6044340543574178 * radial thickness of winding pack (m) (`iteration variable 140`) (issue #514)
 temp_tf_cryo   = 20.0 * coil temperature for cryogenic plant power calculation (K)
diff --git a/tests/regression/input_files/st_regression.IN.DAT b/tests/regression/input_files/st_regression.IN.DAT
index b3da2cd28e..c1a763f344 100644
--- a/tests/regression/input_files/st_regression.IN.DAT
+++ b/tests/regression/input_files/st_regression.IN.DAT
@@ -1330,7 +1330,7 @@ temp_tf_cryo = 20.0
 * DESCRIPTION:   Coil temperature for cryogenic plant power calculation (K)
 * JUSTIFICATION: 
 
-tftmp = 20.0 
+temp_tf_operating = 20.0 
 * DESCRIPTION:   Peak helium coolant temperature in TF coils and PF coils [K]
 * JUSTIFICATION: TF coil joints much easier at 20 K.
 *                We set the temperature at 19.9K for run convergence issues
diff --git a/tests/regression/input_files/stellarator_helias.IN.DAT b/tests/regression/input_files/stellarator_helias.IN.DAT
index 73480c5d80..5081668a78 100644
--- a/tests/regression/input_files/stellarator_helias.IN.DAT
+++ b/tests/regression/input_files/stellarator_helias.IN.DAT
@@ -233,7 +233,7 @@ runtitle = SQuID
 *-----------------Tfcoil Variables-----------------*
 
 i_tf_sc_mat = 1         * Switch for superconductor material in tf coils (1: ITER Nb3Sn)
-tftmp     = 4.5         * Peak helium coolant temperature in TF coils and PF coils (K)
+temp_tf_operating     = 4.5         * Peak helium coolant temperature in TF coils and PF coils (K)
 tmargmin = 1.5          * Temperature margin for superconductor current density calculation (K)
 temp_tf_cryo = 4.5      * Coil temperature for cryogenic plant power calculation (K)
 dx_tf_turn_general = 0.056                * Dimension conductor area including steel and insulation.
diff --git a/tests/unit/data/large_tokamak_IN.DAT b/tests/unit/data/large_tokamak_IN.DAT
index 16230592e5..7eb764a9bd 100644
--- a/tests/unit/data/large_tokamak_IN.DAT
+++ b/tests/unit/data/large_tokamak_IN.DAT
@@ -561,7 +561,7 @@ dx_tf_wp_insulation = 0.008
 dia_tf_turn_coolant_channel = 0.01
 
 * Helium coolant temperature [K]
-tftmp = 4.75
+temp_tf_operating = 4.75
 
 * Coolant fraction of TF cable [-]
 f_a_tf_turn_cable_space_extra_void = 0.3
diff --git a/tests/unit/models/test_costs_1990.py b/tests/unit/models/test_costs_1990.py
index 6516137dc9..6bf28717d9 100644
--- a/tests/unit/models/test_costs_1990.py
+++ b/tests/unit/models/test_costs_1990.py
@@ -124,7 +124,7 @@ def test_acc2263(monkeypatch, costs):
     monkeypatch.setattr(costs.data.costs, "fkind", 1)
     monkeypatch.setattr(costs.data.costs, "lsa", 4)
     monkeypatch.setattr(costs.data.costs, "uccry", 9.3e4)
-    monkeypatch.setattr(costs.data.tfcoil, "tftmp", 4.5)
+    monkeypatch.setattr(costs.data.tfcoil, "temp_tf_operating", 4.5)
     monkeypatch.setattr(costs.data.heat_transport, "helpow", 80.980e3)
 
     costs.acc2263()
diff --git a/tests/unit/models/test_pfcoil.py b/tests/unit/models/test_pfcoil.py
index 63b7638a9b..0a7a9ecb84 100644
--- a/tests/unit/models/test_pfcoil.py
+++ b/tests/unit/models/test_pfcoil.py
@@ -2465,7 +2465,7 @@ class PFCoilParam(NamedTuple):
     aspect: Any = None
     itart: Any = None
     beta_poloidal_vol_avg: Any = None
-    tftmp: Any = None
+    temp_tf_operating: Any = None
     dcond: Any = None
     fhts: Any = None
     tcritsc: Any = None
@@ -2538,7 +2538,7 @@ class PFCoilParam(NamedTuple):
             aspect=3.1,
             itart=0,
             beta_poloidal_vol_avg=6.313e-1,
-            tftmp=4.750,
+            temp_tf_operating=4.750,
             dcond=np.full(9, 9.0e3),
             fhts=0.5,
             tcritsc=1.6e1,
@@ -2644,7 +2644,7 @@ def test_pfcoil(monkeypatch, pfcoil, pfcoilparam):
         monkeypatch.setattr(pfcoil.data.physics, field, getattr(pfcoilparam, field))
 
     for field in [
-        "tftmp",
+        "temp_tf_operating",
         "dcond",
         "fhts",
         "tcritsc",
@@ -2709,7 +2709,7 @@ class OhCalcParam(NamedTuple):
     n_pf_coil_turns: Any = None
     m_pf_coil_structure: Any = None
     dcond: Any = None
-    tftmp: Any = None
+    temp_tf_operating: Any = None
     tcritsc: Any = None
     str_cs_con_res: Any = None
     fhts: Any = None
@@ -2762,7 +2762,7 @@ class OhCalcParam(NamedTuple):
             n_pf_coil_turns=np.full(22, 0.0),
             m_pf_coil_structure=np.full(22, 0.0),
             dcond=np.full(9, 9.0e3),
-            tftmp=4.750,
+            temp_tf_operating=4.750,
             tcritsc=1.6e1,
             str_cs_con_res=-5.000e-3,
             fhts=0.5,
@@ -2838,7 +2838,7 @@ def test_ohcalc(monkeypatch, reinitialise_error_module, cs_coil, ohcalcparam):
 
     for field in [
         "dcond",
-        "tftmp",
+        "temp_tf_operating",
         "tcritsc",
         "str_cs_con_res",
         "fhts",
diff --git a/tracking/tracking_data.py b/tracking/tracking_data.py
index 17572bce5b..48198435b9 100644
--- a/tracking/tracking_data.py
+++ b/tracking/tracking_data.py
@@ -138,7 +138,7 @@
     "HeatTransport.p_plant_electric_net_mw",
     "HeatTransport.eta_turbine",
     "HeatTransport.p_plant_electric_gross_mw",
-    "TFCoil.tftmp",
+    "TFCoil.temp_tf_operating",
     "TFCoil.n_tf_coils",
     "TFCoil.b_tf_inboard_peak_symmetric",
     "PFCoil.vs_cs_pf_total_pulse",