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Output SAM-EM capex as 'Total CAPEX' instead of 'Total capital costs' to distinguish from BICYCLE model's substraction of ITC from 'Total capital costs'.
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‎docs/SAM-Economic-Models.md‎

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@@ -20,7 +20,7 @@ The following table describes how GEOPHIRES parameters are transformed into SAM
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| `Maximum Total Electricity Generation` | Generation Profile | `Nameplate capacity` | `Singleowner` | `system_capacity` | .. N/A |
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| `Utilization Factor` | Generation Profile | `Nominal capacity factor` | `Singleowner` | `user_capacity_factor` | .. N/A |
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| `Net Electricity Generation` | AC Degradation | `Annual AC degradation rate` schedule | `Utilityrate5` | `degradation` | Percentage difference of each year's `Net Electricity Generation` from `Maximum Total Electricity Generation` is input as SAM as the degradation rate schedule in order to match SAM's generation profile to GEOPHIRES |
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| `Total Capital Cost` + `Investment Tax Credit Value` + (`Inflation Rate During Construction` × `Total Capital Cost`) | Installation Costs | `Total Installed Cost` | `Singleowner` | `total_installed_cost` | ITC, if present, is added to GEOPHIRES total capital cost since SAM handles ITC credits in cash flow analysis. Inflation during construction is treated as an indirect EPC capital cost percentage. |
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| `Total CAPEX` × (1 + `Inflation Rate During Construction`) | Installation Costs | `Total Installed Cost` | `Singleowner` | `total_installed_cost` | Inflation during construction is treated as an indirect EPC capital cost percentage. Note that unlike the BICYCLE Economic Model's `Total capital costs`, SAM Economic Model's `Total CAPEX` is the total installed cost and does not subtract ITC value (if present). |
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| `Total O&M Cost`, `Inflation Rate` | Operating Costs | `Fixed operating cost`, `Escalation rate` set to `Inflation Rate` × -1 | `Singleowner` | `om_fixed`, `om_fixed_escal` | .. N/A |
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| `Plant Lifetime` | Financial Parameters → Analysis Parameters | `Analysis period` | `CustomGeneration`, `Singleowner` | `CustomGeneration.analysis_period`, `Singleowner.term_tenor` | .. N/A |
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| `Inflation Rate` | Financial Parameters → Analysis Parameters | `Inflation rate` | `Utilityrate5` | `inflation_rate` | .. N/A |
@@ -56,7 +56,8 @@ The following table describes how GEOPHIRES parameters are transformed into SAM
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## Using SAM Economic Models with Existing GEOPHIRES Inputs
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In many cases, all you need to do to use SAM Economic Models for your existing GEOPHIRES inputs is to change the `Economic Model` parameter value.
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In many cases, all you need to do to use SAM Economic Models for your existing GEOPHIRES inputs is to change the
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`Economic Model` parameter value.
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For example, if your GEOPHIRES `.txt` file contained the following:
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```
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Plant Lifetime, 30
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```
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Change `Economic Model` and replace `Inflated Equity Interest Rate` with a suitable `Discount Rate` and `Inflation Rate`:
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Change `Economic Model` and replace `Inflated Equity Interest Rate` with a suitable `Discount Rate` and
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`Inflation Rate`:
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```
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# *** Financial Parameters ***

‎src/geophires_x/Economics.py‎

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non_calculated_output_placeholder_val = -1
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if self.econmodel.value == EconomicModel.SAM_SINGLE_OWNER_PPA:
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self.sam_economics_calculations = calculate_sam_economics(model)
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# Distinguish capex from default display name of 'Total capital costs' since SAM Economic Model doesn't
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# subtract ITC from this value.
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self.CCap.display_name = 'Total CAPEX'
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self.CCap.value = self.sam_economics_calculations.capex.quantity().to(self.CCap.CurrentUnits.value).magnitude
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self.wacc.value = self.sam_economics_calculations.wacc.value
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self.nominal_discount_rate.value = self.sam_economics_calculations.nominal_discount_rate.value
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self.ProjectNPV.value = self.sam_economics_calculations.project_npv.quantity().to(

‎src/geophires_x/EconomicsSam.py‎

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itc = econ.RITCValue.quantity()
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total_capex = econ.CCap.quantity() + itc
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# 'Inflation Rate During Construction'
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construction_additional_cost = econ.inflrateconstruction.value * total_capex
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ret['total_installed_cost'] = (total_capex + construction_additional_cost).to('USD').magnitude
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ret['total_installed_cost'] = (total_capex * (1 + econ.inflrateconstruction.value)).to('USD').magnitude
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opex_musd = econ.Coam.value
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ret['om_fixed'] = [opex_musd * 1e6]

‎src/geophires_x/Outputs.py‎

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f.write(f' Stimulation costs (for redrilling): {model.economics.Cstim.value:10.2f} ' + model.economics.Cstim.CurrentUnits.value + NL)
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if model.economics.RITCValue.value:
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f.write(f' {model.economics.RITCValue.display_name}: {-1*model.economics.RITCValue.value:10.2f} {model.economics.RITCValue.CurrentUnits.value}\n')
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f.write(f' {model.economics.CCap.display_name}: {model.economics.CCap.value:10.2f} {model.economics.CCap.CurrentUnits.value}\n')
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capex_label = Outputs._field_label(econ.CCap.display_name, 50)
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f.write(f' {capex_label}{econ.CCap.value:10.2f} {econ.CCap.CurrentUnits.value}\n')
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if model.economics.econmodel.value == EconomicModel.FCR:
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f.write(f' Annualized capital costs: {(model.economics.CCap.value*(1+model.economics.inflrateconstruction.value)*model.economics.FCR.value):10.2f} ' + model.economics.CCap.CurrentUnits.value + NL)
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‎tests/examples/Fervo_Project_Cape-4.out‎

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----------------------
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GEOPHIRES Version: 3.9.11
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Simulation Date: 2025-05-27
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Simulation Time: 09:32
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Calculation Time: 1.055 sec
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Simulation Time: 10:11
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Calculation Time: 1.040 sec
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***SUMMARY OF RESULTS***
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Total surface equipment costs: 1601.68 MUSD
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Exploration costs: 30.00 MUSD
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Investment Tax Credit: -678.02 MUSD
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Total capital costs: 1582.04 MUSD
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Total CAPEX: 2373.06 MUSD
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***OPERATING AND MAINTENANCE COSTS (M$/yr)***

‎tests/examples/example_SAM-single-owner-PPA-2.out‎

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Simulation Metadata
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----------------------
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GEOPHIRES Version: 3.9.10
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Simulation Date: 2025-05-23
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Simulation Time: 12:57
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Calculation Time: 0.879 sec
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GEOPHIRES Version: 3.9.11
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Simulation Date: 2025-05-27
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Simulation Time: 10:11
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Calculation Time: 0.908 sec
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***SUMMARY OF RESULTS***
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Total surface equipment costs: 969.26 MUSD
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Exploration costs: 30.00 MUSD
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Investment Tax Credit: -459.83 MUSD
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Total capital costs: 1072.95 MUSD
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Total CAPEX: 1609.42 MUSD
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***OPERATING AND MAINTENANCE COSTS (M$/yr)***

‎tests/examples/example_SAM-single-owner-PPA.out‎

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Simulation Metadata
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----------------------
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GEOPHIRES Version: 3.9.10
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Simulation Date: 2025-05-23
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Simulation Time: 12:57
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Calculation Time: 1.052 sec
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GEOPHIRES Version: 3.9.11
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Simulation Date: 2025-05-27
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Simulation Time: 10:10
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Calculation Time: 1.053 sec
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***SUMMARY OF RESULTS***
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Total surface equipment costs: 189.88 MUSD
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Exploration costs: 3.89 MUSD
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Investment Tax Credit: -75.60 MUSD
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Total capital costs: 176.40 MUSD
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Total CAPEX: 264.61 MUSD
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***OPERATING AND MAINTENANCE COSTS (M$/yr)***

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