Recalibrate field gathering costs to approximately 2% of capex

Author: softwareengineerprogrammer

docs/Fervo_Project_Cape-4.md

@@ -61,14 +61,14 @@ in source code for the full set of inputs.
 
 | Metric                               | Result Value                                              | Reference Value(s)                                 | Reference Source                                                                                                                                                                                                                                                                                                                                               |
 |--------------------------------------|-----------------------------------------------------------|----------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| LCOE                                 | $83.5/MWh                                                 | $80/MWh                                            | Horne, R., Genter, A., McClure, M. et al. Enhanced geothermal systems for clean firm energy generation. Nat. Rev. Clean Technol. 1, 148–160 (2025). https://doi.org/10.1038/s44359-024-00019-9                                                                                                                                                                 |
-| Project capital costs                | ~$4600/kW (based on maximum total electricity generation) | $4500/kW, $3000–$6000/kW                           | Horne, R., Genter, A., McClure, M. et al. Enhanced geothermal systems for clean firm energy generation. Nat. Rev. Clean Technol. 1, 148–160 (2025). https://doi.org/10.1038/s44359-024-00019-9; Latimer, T. (2025, February 12). Catching up with enhanced geothermal (D. Roberts, Interviewer). https://www.volts.wtf/p/catching-up-with-enhanced-geothermal. |
+| LCOE                                 | $83.8/MWh                                                 | $80/MWh                                            | Horne, R., Genter, A., McClure, M. et al. Enhanced geothermal systems for clean firm energy generation. Nat. Rev. Clean Technol. 1, 148–160 (2025). https://doi.org/10.1038/s44359-024-00019-9                                                                                                                                                                 |
+| Project capital costs                | ~$4650/kW (based on maximum total electricity generation) | $4500/kW, $3000–$6000/kW                           | Horne, R., Genter, A., McClure, M. et al. Enhanced geothermal systems for clean firm energy generation. Nat. Rev. Clean Technol. 1, 148–160 (2025). https://doi.org/10.1038/s44359-024-00019-9; Latimer, T. (2025, February 12). Catching up with enhanced geothermal (D. Roberts, Interviewer). https://www.volts.wtf/p/catching-up-with-enhanced-geothermal. |
 | Maximum Total Electricity Generation | 615 MW                                                    |                                                    | Actual maximum total generation may be bounded or constrained by modular power plant design not modeled in this case study. For example, a modular design with 50MW units may constrain maximum total generation to 600 MW.                                                                                                                                    |
 | Minimum Net Electricity Generation   | 500 MW                                                    | 500 MW                                             | https://fervoenergy.com/fervo-energy-announces-31-mw-power-purchase-agreement-with-shell-energy/. The 500 MW PPA is interpreted to mean that Cape Station's net electricity generation must never fall below 500 MWe.                                                                                                                                          |
 | Average Production Temperature       | 198.9℃                                                    | 204℃, 190.6–198.6℃ (optimal plant operating range) | https://jpt.spe.org/fervo-and-forge-report-breakthrough-test-results-signaling-more-progress-for-enhanced-geothermal; https://eartharxiv.org/repository/view/7665/.                                                                                                                                                                                            |
 | Well Drilling and Completion Cost    | $3.96M/well                                               | $<4M/well                                          | Latimer, T. (2025, February 12). Catching up with enhanced geothermal (D. Roberts, Interviewer). https://www.volts.wtf/p/catching-up-with-enhanced-geothermal                                                                                                                                                                                                  |
 | WACC                                 | 8.3%                                                      | 8.3%                                               | https://www.linkedin.com/pulse/fervo-energy-technology-day-2024-entering-geothermal-decade-matson-n4stc                                                                                                                                                                                                                                                        |
-| After-tax IRR                        | 24.36%                                                    | 15–25%                                             | Typical levered returns for energy projects                                                                                                                                                                                                                                                                                                                    |
+| After-tax IRR                        | 24.07%                                                    | 15–25%                                             | Typical levered returns for energy projects                                                                                                                                                                                                                                                                                                                    |
 | Number of times redrilling           | 2                                                         | 1–4                                                | Redrilling expected to be required within 5–10 years of project start                                                                                                                                                                                                                                                                                          |
 
 See [Fervo_Project_Cape-4.out](https://github.com/softwareengineerprogrammer/GEOPHIRES/blob/main/tests/examples/Fervo_Project_Cape-4.out)