Document Fervo_Project_Cape-4 construction time = 3 years

Author: softwareengineerprogrammer

docs/Fervo_Project_Cape-4.md

@@ -61,6 +61,7 @@ in source code for the full set of inputs.
 | Parameter                     | Input Value(s)             | Source                                                                                                                                                                                                                                                                                                                                         |
 |-------------------------------|----------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | Plant Lifetime                | 30 years                   | 30-year well life per Fervo Energy, 2025 (Geothermal Mythbusting: Water Use and Impacts).                                                                                                                                                                                                                                                      |
+| Construction time             | 3 years                    | Based on 2-6 year construction time for a 1 GW plant (Yusifov & Enriquez, 2025).                                                                                                                                                                                                                                                               |
 | Well diameter                 | 9⅝ inches                  | Next standard size up from 7", implied by announcement of "increasing casing diameter"                                                                                                                                                                                                                                                         |
 | Flow Rate per Production Well | 107 kg/s                   | Fercho et al, 2025 models reservoir performance using 100 kg/s per well. The announced increased casing diameter implies higher flow rates, so the case study uses the maximum flow rate achieved at Cape Station of 107 kg/s per Fervo Energy, 2024.                                                                                          |
 | Number of Doublets            | 59                         | Estimate based on extrapolation from previous case studies including [Project Red](https://gtp.scientificwebservices.com/geophires/?geophires-example-id=Fervo_Norbeck_Latimer_2023) and [Fervo_Project_Cape-3](https://gtp.scientificwebservices.com/geophires/?geophires-example-id=Fervo_Project_Cape-3)                                    |
@@ -161,3 +162,6 @@ System. https://doi.org/10.31223/X52X0B
 
 US DOE. (2021). Combined Heat and Power Technology Fact Sheet Series: Waste Heat to
 Power. https://betterbuildingssolutioncenter.energy.gov/sites/default/files/attachments/Waste_Heat_to_Power_Fact_Sheet.pdf
+
+Yusifov, M., & Enriquez, N. (2025, July). From Core to Code: Powering the Al Revolution with Geothermal Energy.
+Project InnerSpace. https://projectinnerspace.org/resources/Powering-the-AI-Revolution.pdf