NatLabRockies · softwareengineerprogrammer · Jul 6, 2026 · Jun 18, 2026 · Jun 18, 2026 · Jun 18, 2026
diff --git a/.bumpversion.cfg b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 3.14.1
+current_version = 3.15.2
 commit = True
 tag = True
 

diff --git a/.cookiecutterrc b/.cookiecutterrc
@@ -54,7 +54,7 @@ default_context:
     sphinx_doctest: "no"
     sphinx_theme: "sphinx-py3doc-enhanced-theme"
     test_matrix_separate_coverage: "no"
-    version: 3.14.1
+    version: 3.15.2
     version_manager: "bump2version"
     website: "https://github.com/NREL"
     year_from: "2023"

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
@@ -5,6 +5,11 @@ Changelog
 GEOPHIRES v3 (2023-2026)
 ------------------------
 
+3.15
+^^^^
+
+3.15: `Calculate S-DAC carbon revenue (BICYCLE); Reservoir Stimulation Capital Cost per Fracture Surface Area <https://github.com/NREL/GEOPHIRES-X/pull/510>`__ | `release <https://github.com/NREL/GEOPHIRES-X/releases/tag/v3.15.2>`__ | **Changed:** S-DAC carbon revenue is now calculated. See `the tracking issue <https://github.com/NatLabRockies/GEOPHIRES-X/issues/341>`__ for details.
+
 3.14
 ^^^^
 

diff --git a/README.rst b/README.rst
@@ -58,9 +58,9 @@ Free software: `MIT license <LICENSE>`__
     :alt: Supported implementations
     :target: https://pypi.org/project/geophires-x
 
-.. |commits-since| image:: https://img.shields.io/github/commits-since/softwareengineerprogrammer/GEOPHIRES-X/v3.14.1.svg
+.. |commits-since| image:: https://img.shields.io/github/commits-since/softwareengineerprogrammer/GEOPHIRES-X/v3.15.2.svg
     :alt: Commits since latest release
-    :target: https://github.com/softwareengineerprogrammer/GEOPHIRES-X/compare/v3.14.1...main
+    :target: https://github.com/softwareengineerprogrammer/GEOPHIRES-X/compare/v3.15.2...main
 
 .. |docs| image:: https://readthedocs.org/projects/GEOPHIRES-X/badge/?style=flat
     :target: https://softwareengineerprogrammer.github.io/GEOPHIRES
@@ -176,22 +176,70 @@ Example-specific web interface deeplinks are listed in the Link column.
      - `Fervo_Project_Cape-6.txt <tests/examples/Fervo_Project_Cape-6.txt>`__
      - `.out <tests/examples/Fervo_Project_Cape-6.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=Fervo_Project_Cape-6>`__
+   * -  
+     -  
+     -  
+     -  
    * - Example 1: EGS Electricity
      - `example1.txt <tests/examples/example1.txt>`__
      - `.out <tests/examples/example1.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example1>`__
+   * - SAM Single Owner PPA: 50 MWe (`documentation <https://softwareengineerprogrammer.github.io/GEOPHIRES/SAM-Economic-Models.html>`__)
+     - `example_SAM-single-owner-PPA.txt <tests/examples/example_SAM-single-owner-PPA.txt>`__
+     - `.out <tests/examples/example_SAM-single-owner-PPA.out>`__
+     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA>`__
    * - Example 1 with Add-Ons
      - `example1_addons.txt <tests/examples/example1_addons.txt>`__
      - `.out <tests/examples/example1_addons.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example1_addons>`__
+   * - SAM Single Owner PPA: 50 MWe with Add-ons
+     - `example_SAM-single-owner-PPA-3.txt <tests/examples/example_SAM-single-owner-PPA-3.txt>`__
+     - `.out <tests/examples/example_SAM-single-owner-PPA-3.out>`__
+     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-3>`__
+   * -  
+     -  
+     -  
+     -  
    * - Example 2: EGS Direct-Use Heat
      - `example2.txt <tests/examples/example2.txt>`__
      - `.out <tests/examples/example2.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example2>`__
+   * - SAM Single Owner PPA: Direct-Use Heat
+     - `example_SAM-single-owner-PPA-8_heat.txt <tests/examples/example_SAM-single-owner-PPA-8_heat.txt>`__
+     - `.out <tests/examples/example_SAM-single-owner-PPA-8_heat.out>`__
+     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-8_heat>`__
+   * -  
+     -  
+     -  
+     -  
    * - Example 3: EGS Co-generation
      - `example3.txt <tests/examples/example3.txt>`__
      - `.out <tests/examples/example3.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example3>`__
+   * - SAM Single Owner PPA: CHP
+     - `example_SAM-single-owner-PPA-7_chp.txt <tests/examples/example_SAM-single-owner-PPA-7_chp.txt>`__
+     - `.out <tests/examples/example_SAM-single-owner-PPA-7_chp.out>`__
+     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-7_chp>`__
+   * - SAM Single Owner PPA: CHP with Carbon Credits
+     - `example_SAM-single-owner-PPA-7b_chp-cc.txt <tests/examples/example_SAM-single-owner-PPA-7b_chp-cc.txt>`__
+     - `.out <tests/examples/example_SAM-single-owner-PPA-7b_chp-cc.out>`__
+     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-7b_chp-cc>`__
+   * - SAM Single Owner PPA: CHP with Surface Plant Capital Cost
+     - `example_SAM-single-owner-PPA-7c.txt <tests/examples/example_SAM-single-owner-PPA-7c.txt>`__
+     - `.out <tests/examples/example_SAM-single-owner-PPA-7c.out>`__
+     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-7c>`__
+   * - SAM Single Owner PPA: CHP: Bottoming Cycle
+     - `example_SAM-single-owner-PPA-7d_chp-bottoming.txt <tests/examples/example_SAM-single-owner-PPA-7d_chp-bottoming.txt>`__
+     - `.out <tests/examples/example_SAM-single-owner-PPA-7d_chp-bottoming.out>`__
+     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-7d_chp-bottoming>`__
+   * - SAM Single Owner PPA: CHP: Parallel Cycle
+     - `example_SAM-single-owner-PPA-7e_chp-parallel.txt <tests/examples/example_SAM-single-owner-PPA-7e_chp-parallel.txt>`__
+     - `.out <tests/examples/example_SAM-single-owner-PPA-7e_chp-parallel.out>`__
+     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-7e_chp-parallel>`__
+   * -  
+     -  
+     -  
+     -  
    * - Example 4: Hydrothermal Electricity
      - `example4.txt <tests/examples/example4.txt>`__
      - `.out <tests/examples/example4.out>`__
@@ -200,6 +248,10 @@ Example-specific web interface deeplinks are listed in the Link column.
      - `example4.txt <tests/examples/example4b_drawdown-schedule.txt>`__
      - `.out <tests/examples/example4b_drawdown-schedule.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example4b_drawdown-schedule>`__
+   * -  
+     -  
+     -  
+     -  
    * - Example 5: User-Provided Reservoir Data (File Parameter)
      - `example5.txt <tests/examples/example5.txt>`__
      - `.out <tests/examples/example5.out>`__
@@ -208,6 +260,10 @@ Example-specific web interface deeplinks are listed in the Link column.
      - `example5b.txt <tests/examples/example5b.txt>`__
      - `.out <tests/examples/example5b.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example5b>`__
+   * -  
+     -  
+     -  
+     -  
    * - Example 6: TOUGH2 (Multiple Gradients)
      - `example6.txt <tests/examples/example6.txt>`__
      - `.out <tests/examples/example6.out>`__
@@ -216,6 +272,10 @@ Example-specific web interface deeplinks are listed in the Link column.
      - `example7.txt <tests/examples/example7.txt>`__
      - `.out <tests/examples/example7.out>`__
      - \*
+   * -  
+     -  
+     -  
+     -  
    * - Example 8: Cornell Direct-Use Heat
      - `example8.txt <tests/examples/example8.txt>`__
      - `.out <tests/examples/example8.out>`__
@@ -224,18 +284,38 @@ Example-specific web interface deeplinks are listed in the Link column.
      - `example9.txt <tests/examples/example9.txt>`__
      - `.out <tests/examples/example9.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example9>`__
+   * -  
+     -  
+     -  
+     -  
    * - Example 10: Heat Pump
      - `example10_HP.txt <tests/examples/example10_HP.txt>`__
      - `.out <tests/examples/example10_HP.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example10_HP>`__
+   * -  
+     -  
+     -  
+     -  
    * - Example 11: Absorption Chiller
      - `example11_AC.txt <tests/examples/example11_AC.txt>`__
      - `.out <tests/examples/example11_AC.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example11_AC>`__
+   * - SAM Single Owner PPA: Cooling
+     - `example_SAM-single-owner-PPA-9_cooling.txt <tests/examples/example_SAM-single-owner-PPA-9_cooling.txt>`__
+     - `.out <tests/examples/example_SAM-single-owner-PPA-9_cooling.out>`__
+     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-9_cooling>`__
+   * -  
+     -  
+     -  
+     -  
    * - Example 12: District Heating
      - `example12_DH.txt <tests/examples/example12_DH.txt>`__
      - `.out <tests/examples/example12_DH.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example12_DH>`__
+   * -  
+     -  
+     -  
+     -  
    * - Example 13: Redrilling due to Drawdown
      - `example13.txt <tests/examples/example13.txt>`__
      - `.out <tests/examples/example13.out>`__
@@ -244,10 +324,18 @@ Example-specific web interface deeplinks are listed in the Link column.
      - `example13.txt <tests/examples/example13b_well-integrity.txt>`__
      - `.out <tests/examples/example13b_well-integrity.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example13b_well-integrity>`__
+   * -  
+     -  
+     -  
+     -  
    * - Example 14: Data Center
      - `example14_data-center.txt <tests/examples/example14_data-center.txt>`__
      - `.out <tests/examples/example14_data-center.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example14_data-center>`__
+   * -  
+     -  
+     -  
+     -  
    * - CLGS: Coaxial sCO2: Heat
      - `[...]Coaxial_sCO2_heat.txt <tests/examples/Beckers_et_al_2023_Tabulated_Database_Coaxial_sCO2_heat.txt>`__
      - `.out <tests/examples/Beckers_et_al_2023_Tabulated_Database_Coaxial_sCO2_heat.out>`__
@@ -284,6 +372,10 @@ Example-specific web interface deeplinks are listed in the Link column.
      - `example_SBT_ULoop.txt <tests/examples/example_SBT_ULoop.txt>`__
      - `.out <tests/examples/example_SBT_ULoop.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SBT_ULoop>`__
+   * -  
+     -  
+     -  
+     -  
    * - SUTRA Example 1
      - `SUTRAExample1.txt <tests/examples/SUTRAExample1.txt>`__
      - `.out <tests/examples/SUTRAExample1.out>`__
@@ -300,6 +392,10 @@ Example-specific web interface deeplinks are listed in the Link column.
      - `example_PTC.txt <tests/examples/example_PTC.txt>`__
      - `.out <tests/examples/example_PTC.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_PTC>`__
+   * -  
+     -  
+     -  
+     -  
    * - Fervo Project Red (2023)
      - `Fervo_Norbeck_Latimer_2023.txt <tests/examples/Fervo_Norbeck_Latimer_2023.txt>`__
      - `.out <tests/examples/Fervo_Norbeck_Latimer_2023.out>`__
@@ -324,6 +420,10 @@ Example-specific web interface deeplinks are listed in the Link column.
      - `Fervo_Project_Cape-4.txt <tests/examples/Fervo_Project_Cape-4.txt>`__
      - `.out <tests/examples/Fervo_Project_Cape-4.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=Fervo_Project_Cape-4>`__
+   * -  
+     -  
+     -  
+     -  
    * - Superhot Rock (SHR) Example 1
      - `example_SHR-1.txt <tests/examples/example_SHR-1.txt>`__
      - `.out <tests/examples/example_SHR-1.out>`__
@@ -336,18 +436,14 @@ Example-specific web interface deeplinks are listed in the Link column.
      - `example_SHR-3.txt <tests/examples/example_SHR-3.txt>`__
      - `.out <tests/examples/example_SHR-3.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SHR-3>`__
-   * - SAM Single Owner PPA: 50 MWe (`documentation <https://softwareengineerprogrammer.github.io/GEOPHIRES/SAM-Economic-Models.html>`__)
-     - `example_SAM-single-owner-PPA.txt <tests/examples/example_SAM-single-owner-PPA.txt>`__
-     - `.out <tests/examples/example_SAM-single-owner-PPA.out>`__
-     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA>`__
+   * -  
+     -  
+     -  
+     -  
    * - SAM Single Owner PPA: 400 MWe BICYCLE Comparison
      - `example_SAM-single-owner-PPA-2.txt <tests/examples/example_SAM-single-owner-PPA-2.txt>`__
      - `.out <tests/examples/example_SAM-single-owner-PPA-2.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-2>`__
-   * - SAM Single Owner PPA: 50 MWe with Add-ons
-     - `example_SAM-single-owner-PPA-3.txt <tests/examples/example_SAM-single-owner-PPA-3.txt>`__
-     - `.out <tests/examples/example_SAM-single-owner-PPA-3.out>`__
-     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-3>`__
    * - SAM Single Owner PPA: 50 MWe with Royalties
      - `example_SAM-single-owner-PPA-4.txt <tests/examples/example_SAM-single-owner-PPA-4.txt>`__
      - `.out <tests/examples/example_SAM-single-owner-PPA-4.out>`__
@@ -364,34 +460,6 @@ Example-specific web interface deeplinks are listed in the Link column.
      - `example_SAM-single-owner-PPA-6_carbon-revenue.txt <tests/examples/example_SAM-single-owner-PPA-6_carbon-revenue.txt>`__
      - `.out <tests/examples/example_SAM-single-owner-PPA-6_carbon-revenue.out>`__
      - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-6_carbon-revenue>`__
-   * - SAM Single Owner PPA: CHP
-     - `example_SAM-single-owner-PPA-7_chp.txt <tests/examples/example_SAM-single-owner-PPA-7_chp.txt>`__
-     - `.out <tests/examples/example_SAM-single-owner-PPA-7_chp.out>`__
-     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-7_chp>`__
-   * - SAM Single Owner PPA: CHP with Carbon Credits
-     - `example_SAM-single-owner-PPA-7b_chp-cc.txt <tests/examples/example_SAM-single-owner-PPA-7b_chp-cc.txt>`__
-     - `.out <tests/examples/example_SAM-single-owner-PPA-7b_chp-cc.out>`__
-     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-7b_chp-cc>`__
-   * - SAM Single Owner PPA: CHP with Surface Plant Capital Cost
-     - `example_SAM-single-owner-PPA-7c.txt <tests/examples/example_SAM-single-owner-PPA-7c.txt>`__
-     - `.out <tests/examples/example_SAM-single-owner-PPA-7c.out>`__
-     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-7c>`__
-   * - SAM Single Owner PPA: CHP: Bottoming Cycle
-     - `example_SAM-single-owner-PPA-7d_chp-bottoming.txt <tests/examples/example_SAM-single-owner-PPA-7d_chp-bottoming.txt>`__
-     - `.out <tests/examples/example_SAM-single-owner-PPA-7d_chp-bottoming.out>`__
-     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-7d_chp-bottoming>`__
-   * - SAM Single Owner PPA: CHP: Parallel Cycle
-     - `example_SAM-single-owner-PPA-7e_chp-parallel.txt <tests/examples/example_SAM-single-owner-PPA-7e_chp-parallel.txt>`__
-     - `.out <tests/examples/example_SAM-single-owner-PPA-7e_chp-parallel.out>`__
-     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-7e_chp-parallel>`__
-   * - SAM Single Owner PPA: Direct-Use Heat
-     - `example_SAM-single-owner-PPA-8_heat.txt <tests/examples/example_SAM-single-owner-PPA-8_heat.txt>`__
-     - `.out <tests/examples/example_SAM-single-owner-PPA-8_heat.out>`__
-     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-8_heat>`__
-   * - SAM Single Owner PPA: Cooling
-     - `example_SAM-single-owner-PPA-9_cooling.txt <tests/examples/example_SAM-single-owner-PPA-9_cooling.txt>`__
-     - `.out <tests/examples/example_SAM-single-owner-PPA-9_cooling.out>`__
-     - `link <https://gtp.scientificwebservices.com/geophires?geophires-example-id=example_SAM-single-owner-PPA-9_cooling>`__
 .. raw:: html
 
    <embed>

diff --git a/docs/Fervo_Project_Cape-5.md.jinja b/docs/Fervo_Project_Cape-5.md.jinja
@@ -321,6 +321,7 @@ See [GEOPHIRES Economic Outputs documentation](parameters.html#economic-paramete
 | Maximum Net Electricity Generation   | {{ max_net_generation_mwe}} MW | | |
 | Maximum Total Electricity Generation | {{ max_total_generation_mwe }} MW | Upper bound: 600 MW  | Combined nameplate capacity of 10×60 MWe Gen 2 ORCs. A total of 8×60 MWe Gen 2 ORCs have been announced for Phase II; 3 from Turboden and 5 from Baker Hughes (Turboden, 2025; Jacobs, 2025). This equates to 480 MW gross capacity for Phase II's 400 MW net capacity. An equivalent SOAK 500 MW project would therefore require 10 Gen 2 ORC units. (Note that the modular Gen 2 ORCs are not individually modeled in this case study, and are assumed to be combined into a single power plant.) |
 | 2-year Average Net Power Production per Production Well | {{ two_year_avg_net_power_mwe_per_production_well }} MW | 7.6–11.5 MW | Figures 4 and 12 (Singh et al., 2025). |
+| Heat to Power Conversion Efficiency  | {{ heat_to_power_conversion_efficiency_pct ~ '%' }} | 19.5% (Likely omits internal plant parasitic loads, such as condenser fans, which GEOPHIRES explicitly accounts for.) | DeGolyer and MacNaughton, 2024. |
 | Injection Pumping Parasitic Load <br/> ({Average Pumping Power}/{Average Total Electricity Generation}) | {{ parasitic_loss_pct ~ '%' }}  | Upper bound: 16.7% | The Phase II procurement strategy (480 MW gross / 400 MW net) implies a design ceiling of 16.7% for total on-site consumption (including injection pumping). Current SOAK targets for parasitic consumption range from 15–20%, reflecting a planned reduction from the ~25–30% observed in Phase I operations (Norbeck, 2026). |
 | Total fracture surface area per well | {{ total_fracture_surface_area_per_well_mm2 }}×10⁶ m² <br/> ({{ total_fracture_surface_area_per_well_mft2 }} million ft²) | Project Red: 2.787×10⁶ m² <br/> (30 million ft²) | Greater fracture surface area expected than Project Red (Fercho et al., 2025). |
 | Reservoir Volume | {{ reservoir_volume_m3 }} m³ | | Calculated from fracture area × fracture separation × number of fractures per well × number of wells |
@@ -567,6 +568,11 @@ https://www.baytexenergy.com/content/uploads/2024/04/24-04-Baytex-Eagle-Ford-Pre
 Beckers, K., McCabe, K. (2019) GEOPHIRES v2.0: updated geothermal techno-economic simulation tool. Geotherm Energy
 7,5. https://doi.org/10.1186/s40517-019-0119-6
 
+DeGolyer and MacNaughton. (2024, September 24).
+Report as of June 30, 2024 on Heat Initially In Place associated with the Project Cape Area prepared for Fervo Energy.
+Securities and Exchange Commission, Exhibit 99.1.
+https://www.sec.gov/Archives/edgar/data/1853868/000162828026025821/exhibit991-sx1.htm
+
 Fercho, S., Matson, G., McConville, E., Rhodes, G., Jordan, R., Norbeck, J.. (2024, February 12).
 Geology, Temperature, Geophysics, Stress Orientations, and Natural Fracturing in the Milford
 Valley, UT Informed by the Drilling Results of the First Horizontal Wells at the Cape Modern

diff --git a/docs/_images/fervo_project_cape-5-power-production.png b/docs/_images/fervo_project_cape-5-power-production.png
diff --git a/docs/_images/fervo_project_cape-5-production-temperature.png b/docs/_images/fervo_project_cape-5-production-temperature.png
diff --git a/docs/_images/fervo_project_cape-5-sensitivity-analysis-irr.png b/docs/_images/fervo_project_cape-5-sensitivity-analysis-irr.png
-Original file line number
+Diff line change
@@ Expand Up / @@ -5,6 +5,11 @@ Changelog @@
     GEOPHIRES v3 (2023-2026)
     ------------------------
+.15
+    ^^^^
+.15: `Calculate S-DAC carbon revenue (BICYCLE); Reservoir Stimulation Capital Cost per Fracture Surface Area <https://github.com/NREL/GEOPHIRES-X/pull/510>`__ | `release <https://github.com/NREL/GEOPHIRES-X/releases/tag/v3.15.2>`__ | **Changed:** S-DAC carbon revenue is now calculated. See `the tracking issue <https://github.com/NatLabRockies/GEOPHIRES-X/issues/341>`__ for details.
 .14
     ^^^^
@@ Expand Down @@