[v3.11.4] Fervo_Project_Cape-5: Multi-Year Construction Timeline and Reservoir Engineering updates; SAM-EM Payback Period; SAM-EM ITC

[softwareengineerprogrammer]

Description

1. Addresses Project Cape Construction Timelines & Reservoir Engineering Updates NatLabRockies/GEOPHIRES-X#443
2. Addresses Remove or clarify SAM-EM project payback period NatLabRockies/GEOPHIRES-X#413 (8764602)
3. Addresses SAM Economic Models ITC should be derived from cash flow NatLabRockies/GEOPHIRES-X#404 (SAM-EM ITC output #124)

Web interface links:

1. Fervo_Project_Cape-5 (500 MW/Phases I & II): https://gtp.scientificwebservices.com/geophires/?shared-geophires-result-id=5d331dd4-8cc3-497f-8197-0ef21116b4cb
2. Fervo_Project_Cape-6 (100 MW/Phase I): https://gtp.scientificwebservices.com/geophires/?shared-geophires-result-id=ab59f0ab-133b-4d5f-b0da-c7d9699dafc0

TODO

Deferred to main repo and/or follow-up PR

1. 🚧 SME review (reservoir engineering)
   1. Explore recalibration to 2 redrillings instead of 3 - either via more stimulated fracture surface area or custom reservoir profile based on Singh et al.
2. 🚧 Calibrate Fervo_Project_Cape-6: 866b4c8, d7bcda0
   1. Strip (irrelevant) param comments: 632e6b4
3. Confirm levelized cost metrics per SAM-EM Multiple Construction Years: SAM SME Design Review NatLabRockies/GEOPHIRES-X#444: 44b9bf1
4. Sensitivity analysis chart tweaks:
   1. Flow rate text overlap
   2. Link titles (on hover)
5. Remove preview designation (867e7c1)
6. Add a CHANGELOG entry for 3.11.4
7. Document inflation rate assumption is higher than ATB (or use ATB value)
8. Add relevant reservoir design figures from https://www.resfrac.com/wp-content/uploads/2025/06/Singh-2025-Fervo-Project-Cape.pdf
   1. 
   2. 
   3. 

Completed

1. Fix layout.html changes relevant to ‼️ Organization name change has broken documentation links NatLabRockies/GEOPHIRES-X#454:
2. Clarify : 5fe4429
3. Clarify 103 kg/s flow rate (Avg net retune closer to 500 MW [2026-01-19] #127): 5c48513
4. Incorporate ATB updates: https://atb.nrel.gov/electricity/2024b/geothermal
5. Royalties (BLM): 469b250
6. Sensitivity analysis: address why higher flow rates != better economics: 632e79e
7. Reference https://www.resfrac.com/wp-content/uploads/2025/06/Singh-2025-Fervo-Project-Cape.pdf: 0b7da6c
8. Calibrate exploration cost to https://atb.nrel.gov/electricity/2024b/geothermal: b94b01f
   1. Created tracking issue to update GEOPHIRES correlation :Update exploration cost correlation according to 2024b ATB NatLabRockies/GEOPHIRES-X#447
9. Documentation and references
   1. Drilling & stim costs clarifications in Inputs: 64da798, 77e5fd2
   2. Clarify calibration of drawdown/redrilling wrt 1-2% expected annual decline: Technical results graphs #125, Production temperature technical results graph #126
   3. Construction CAPEX schedule
   4. Approach & Methodology update: Clarify SOAK vs. FOAK vs. NOAK: 1e960e4
   5. Describe case study use cases e.g. as a template for custom modeling: 1e960e4
   6. ITC
   7. TOD/ambient temp: 3f96592
   8. OCC vs total capex: a791d54
10. Sensitivity analysis: https://github.com/scientific-web-services/geophires-fpc4-sensitivity-analysis
11. Surface temperature fine-tune based on Project InnerSpace GeoMap: 9af9f1d
12. Multiple construction years: Update Fervo_Project_Cape-4 based on publicly stated timelines - https://fervoenergy.com/fervo-energy-raises-462-million-series-e-to-accelerate-geothermal-development-and-meet-surging-energy-demand-with-clean-firm-power/
    1. Phase II: 500 MW: Fervo_Project_Cape-4
    2. Phase I: 100 MW: Fervo_Project_Cape-5: 71607b7
13. Reservoir engineering updates
    1. ~8.5" ID
    2. Flow rate
    3. Fracture surface area
    4. PI/II instead of impedance
    5. Number of Fractures per Stimulated Well
    6. Increased lateral length (adjust fracture separation accordingly)
14. Higher discount & bond rates

Testing & Verification

1. Unit tests added: Retains test for previous version: https://github.com/softwareengineerprogrammer/GEOPHIRES/pull/117/changes#diff-77443b51920606ff05244e83370cb4bbd78fb8ee13076d9356d5051c2c9fbef5
2. Unit tests updated: https://github.com/softwareengineerprogrammer/GEOPHIRES/pull/117/changes#diff-35ea0c0b80463f35958a7d1d7396bad7ad397a7c8e8d96a49da5b90e756c7c7c
3. Manually tested

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Change Checklist:

Observe the following checklist items if your change includes a new version (see versioning notes and version management docs).

After merging:

1. Push tag(s) to GitHub: git push origin refs/tags/vM.m.P
2. Post a change announcement to the GEOPHIRES Change Announcements Discussion (example). Markdown template:

M.m.p: [TITLE](https://github.com/NREL/GEOPHIRES-X/pull/PR-NUMBER) | [release](https://github.com/NREL/GEOPHIRES-X/releases/tag/vM.m.P)