Add Inflation Cost During Construction output parameter for SAM econ models - Total CAPEX can now be summed from displayed capital cost line items (yay)

Author: softwareengineerprogrammer

src/geophires_x/Economics.py

@@ -9,7 +9,7 @@
 from geophires_x.EconomicsSam import calculate_sam_economics, SamEconomicsCalculations
 from geophires_x.EconomicsUtils import BuildPricingModel, wacc_output_parameter, nominal_discount_rate_parameter, \
     real_discount_rate_parameter, after_tax_irr_parameter, moic_parameter, project_vir_parameter, \
-    project_payback_period_parameter
+    project_payback_period_parameter, inflation_cost_during_construction_output_parameter
 from geophires_x.GeoPHIRESUtils import quantity
 from geophires_x.OptionList import Configuration, WellDrillingCostCorrelation, EconomicModel, EndUseOptions, PlantType, \
     _WellDrillingCostCorrelationCitation
@@ -1980,6 +1980,9 @@ def __init__(self, model: Model):
                         f'if {self.inflrateconstruction.Name} is not provided.'
         )
 
+        self.inflation_cost_during_construction = self.OutputParameterDict[
+            self.inflation_cost_during_construction.Name] = inflation_cost_during_construction_output_parameter()
+
         self.after_tax_irr = self.OutputParameterDict[self.after_tax_irr.Name] = (
             after_tax_irr_parameter())
         self.real_discount_rate = self.OutputParameterDict[self.real_discount_rate.Name] = (

src/geophires_x/EconomicsSam.py

@@ -37,6 +37,7 @@
     moic_parameter,
     project_vir_parameter,
     project_payback_period_parameter,
+    inflation_cost_during_construction_output_parameter,
 )
 from geophires_x.GeoPHIRESUtils import is_float, is_int, sig_figs, quantity
 from geophires_x.OptionList import EconomicModel, EndUseOptions
@@ -370,6 +371,11 @@ def _get_single_owner_parameters(model: Model) -> dict[str, Any]:
         .magnitude
     )
 
+    econ.inflation_cost_during_construction.value = (
+        (total_capex * (inflation_during_construction_factor - 1))
+        .to(econ.inflation_cost_during_construction.CurrentUnits)
+        .magnitude
+    )
     ret['total_installed_cost'] = (total_capex * inflation_during_construction_factor).to('USD').magnitude
 
     opex_musd = econ.Coam.value

src/geophires_x/EconomicsUtils.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from geophires_x.Parameter import OutputParameter
-from geophires_x.Units import Units, PercentUnit, TimeUnit
+from geophires_x.Units import Units, PercentUnit, TimeUnit, CurrencyUnit
 
 
 def BuildPricingModel(plantlifetime: int, StartPrice: float, EndPrice: float,
@@ -121,3 +121,13 @@ def wacc_output_parameter() -> OutputParameter:
         CurrentUnits=PercentUnit.PERCENT,
         PreferredUnits=PercentUnit.PERCENT,
     )
+
+
+def inflation_cost_during_construction_output_parameter() -> OutputParameter:
+    return OutputParameter(
+        Name='Inflation Cost During Construction',
+        UnitType=Units.CURRENCY,
+        PreferredUnits=CurrencyUnit.MDOLLARS,
+        CurrentUnits=CurrencyUnit.MDOLLARS,
+        ToolTipText='The calculated amount of cost escalation due to inflation over the construction period.'
+    )

src/geophires_x/Outputs.py

@@ -495,6 +495,11 @@ def PrintOutputs(self, model: Model):
                         #  expenditure.
                         pass
 
+                if model.economics.econmodel.value == EconomicModel.SAM_SINGLE_OWNER_PPA:
+                    # TODO calculate & display for other economic models
+                    icc_label = Outputs._field_label(econ.inflation_cost_during_construction.display_name, 48)
+                    f.write(f'         {icc_label}{econ.inflation_cost_during_construction.value:10.2f} {econ.inflation_cost_during_construction.CurrentUnits.value}\n')
+
                 capex_label = Outputs._field_label(econ.CCap.display_name, 50)
                 f.write(f'      {capex_label}{econ.CCap.value:10.2f} {econ.CCap.CurrentUnits.value}\n')
 

src/geophires_x_schema_generator/geophires-result.json

@@ -92,7 +92,7 @@
         },
         "Accrued financing during construction": {
           "type": "number",
-          "description": "The total accrued inflation on total capital costs over the construction period, as defined by Inflation Rate During Construction. For SAM Economic Models, this is calculated automatically by compounding Inflation Rate over Construction Years if Inflation Rate During Construction is not provided.",
+          "description": "The accrued inflation on total capital costs over the construction period, as defined by Inflation Rate During Construction. For SAM Economic Models, this is calculated automatically by compounding Inflation Rate over Construction Years if Inflation Rate During Construction is not provided.",
           "units": "%"
         },
         "Project lifetime": {},

tests/examples/Fervo_Project_Cape-4.out

@@ -6,8 +6,8 @@ Simulation Metadata
 ----------------------
  GEOPHIRES Version: 3.9.40
  Simulation Date: 2025-07-26
- Simulation Time:  13:07
- Calculation Time:      1.733 sec
+ Simulation Time:  13:51
+ Calculation Time:      1.723 sec
 
                            ***SUMMARY OF RESULTS***
 
@@ -104,6 +104,7 @@ Simulation Metadata
          Field gathering system costs:                       56.44 MUSD
          Total surface equipment costs:                    1560.49 MUSD
          Exploration costs:                                  30.00 MUSD
+         Inflation Cost During Construction:                 344.27 MUSD
       Total CAPEX:                                         2639.39 MUSD