diff --git a/Documentation/ProjectFile/prj/processes/process/THERMO_MECHANICS/nonequilibrium_state_variables/i_nonequilibrium_state_variables.md b/Documentation/ProjectFile/prj/processes/process/THERMO_MECHANICS/nonequilibrium_state_variables/i_nonequilibrium_state_variables.md
deleted file mode 100644
index 23309741b0fc69b07f22ace849a85fc90aaab4e8..0000000000000000000000000000000000000000
--- a/Documentation/ProjectFile/prj/processes/process/THERMO_MECHANICS/nonequilibrium_state_variables/i_nonequilibrium_state_variables.md
+++ /dev/null
@@ -1,3 +0,0 @@
-Non-equilibrium initial state variables which are not explicitly in equilibrium
-with any boundary conditions. They are not considered in the weak form but
-affect the constitutive behaviour of the materials.
diff --git a/Documentation/ProjectFile/prj/processes/process/THERMO_MECHANICS/nonequilibrium_state_variables/t_stress.md b/Documentation/ProjectFile/prj/processes/process/THERMO_MECHANICS/nonequilibrium_state_variables/t_stress.md
deleted file mode 100644
index ff6539590e8b21ae4131c798c01d301c47f42b9d..0000000000000000000000000000000000000000
--- a/Documentation/ProjectFile/prj/processes/process/THERMO_MECHANICS/nonequilibrium_state_variables/t_stress.md
+++ /dev/null
@@ -1 +0,0 @@
-Non-equilibrium stress.
diff --git a/ProcessLib/ThermoMechanics/CreateThermoMechanicsProcess.cpp b/ProcessLib/ThermoMechanics/CreateThermoMechanicsProcess.cpp
index a46fad8bee6c0120cf7e0e0e2521d34b184b8f3e..7b30e5574a9aa30ea83c66cbb9d21ff8f274a814 100644
--- a/ProcessLib/ThermoMechanics/CreateThermoMechanicsProcess.cpp
+++ b/ProcessLib/ThermoMechanics/CreateThermoMechanicsProcess.cpp
@@ -166,27 +166,13 @@ std::unique_ptr<Process> createThermoMechanicsProcess(
 
         std::copy_n(b.data(), b.size(), specific_body_force.data());
     }
-    // Non-equilibrium variables
-    ParameterLib::Parameter<double> const* nonequilibrium_stress = nullptr;
-    const auto& nonequilibrium_state_variables_config =
-        //! \ogs_file_param{prj__processes__process__THERMO_MECHANICS__nonequilibrium_state_variables}
-        config.getConfigSubtreeOptional("nonequilibrium_state_variables");
-    if (nonequilibrium_state_variables_config)
-    {
-        nonequilibrium_stress = &ParameterLib::findParameter<double>(
-            *nonequilibrium_state_variables_config,
-            //! \ogs_file_param_special{prj__processes__process__THERMO_MECHANICS__nonequilibrium_state_variables__stress}
-            "stress", parameters,
-            MathLib::KelvinVector::KelvinVectorDimensions<
-                DisplacementDim>::value);
-    }
 
     ThermoMechanicsProcessData<DisplacementDim> process_data{
-        materialIDs(mesh),       std::move(solid_constitutive_relations),
-        reference_solid_density, linear_thermal_expansion_coefficient,
-        specific_heat_capacity,  thermal_conductivity,
-        specific_body_force,     nonequilibrium_stress,
-        mechanics_process_id,    heat_conduction_process_id};
+        materialIDs(mesh),         std::move(solid_constitutive_relations),
+        reference_solid_density,   linear_thermal_expansion_coefficient,
+        specific_heat_capacity,    thermal_conductivity,
+        specific_body_force,       mechanics_process_id,
+        heat_conduction_process_id};
 
     SecondaryVariableCollection secondary_variables;
 
diff --git a/ProcessLib/ThermoMechanics/ThermoMechanicsFEM.h b/ProcessLib/ThermoMechanics/ThermoMechanicsFEM.h
index 4c45008c62f9970610ec39871a7b57ddff054cf1..3bfa7c764febba50bace5c6d798f66ed535288fe 100644
--- a/ProcessLib/ThermoMechanics/ThermoMechanicsFEM.h
+++ b/ProcessLib/ThermoMechanics/ThermoMechanicsFEM.h
@@ -52,12 +52,6 @@ struct IntegrationPointData final
     // mechanical strain
     typename BMatricesType::KelvinVectorType eps_m, eps_m_prev;
 
-    // Non-equilibrium initial stress.
-    typename BMatricesType::KelvinVectorType sigma_neq =
-        BMatricesType::KelvinVectorType::Zero(
-            MathLib::KelvinVector::KelvinVectorDimensions<
-                DisplacementDim>::value);
-
     MaterialLib::Solids::MechanicsBase<DisplacementDim> const& solid_material;
     std::unique_ptr<typename MaterialLib::Solids::MechanicsBase<
         DisplacementDim>::MaterialStateVariables>
diff --git a/ProcessLib/ThermoMechanics/ThermoMechanicsProcessData.h b/ProcessLib/ThermoMechanics/ThermoMechanicsProcessData.h
index 8b9488481551942d828bf253b9506404e6938290..eee568d37a9230ef556b8385e80385d6684d670e 100644
--- a/ProcessLib/ThermoMechanics/ThermoMechanicsProcessData.h
+++ b/ProcessLib/ThermoMechanics/ThermoMechanicsProcessData.h
@@ -44,7 +44,6 @@ struct ThermoMechanicsProcessData
     ParameterLib::Parameter<double> const&
         thermal_conductivity;  // TODO To be changed as a matrix type variable.
     Eigen::Matrix<double, DisplacementDim, 1> const specific_body_force;
-    ParameterLib::Parameter<double> const* const nonequilibrium_stress;
 
     /// ID of the mechanical process.
     int const mechanics_process_id;