| Electrolyzer Foundation | Number | CY | Required | CostPerInstallUnit |
| Electrolyzer — Set | Integer | units | Required | CostPerInstallUnit |
| Electrolyzer Type | Enum | PEM/Alkaline/SOEC | Required | — |
| Electrolyzer — Rating | Number | MW | Required | — |
| Water Purification (DI/RO) | Enum | N/S / Installed / Tested | Required | — |
| Power Supply / Rectifier | Integer | units | Required | — |
| H2 Purification (PSA/membrane) | Enum | N/S / Installed / Tested | Required | — |
| Compressor (H2) — Set | Integer | units | Required | CostPerInstallUnit |
| Compressor — Alignment | Enum | N/T / Pass / Fail | Required | InspectionFirstPassRate |
| Process Piping (ASME B31.12) | Number | LF | Required | CostPerInstallUnit |
| Piping — Material (SS/special alloy) | Text | — | Required (H2 embrittlement) | — |
| Weld — RT/UT | Integer | welds | Required | InspectionFirstPassRate |
| Gas Storage Tank (high pressure) | Integer | tanks | Required | CostPerInstallUnit |
| Tank — Pressure Rating | Number | PSI | Required | — |
| Tank — Volume | Number | kg H2 | Required | — |
| Tube Trailer / MEGC Storage | Integer | units | Required (if applicable) | — |
| Liquid H2 Tank (cryogenic) | Enum | N/A / Set / Insulated / Tested | Required (if LH2) | — |
| Underground Storage (cavern) | Enum | N/A / Drilling / Complete | Best Practice | — |
| H2 Leak Detector | Integer | sensors | Required (NFPA 2) | — |
| Flame Detector (UV/IR) | Integer | sensors | Required (H2 flame invisible) | — |
| Ventilation — H2 Area | Enum | N/S / Installed / Tested | Required (NFPA 2) | — |
| Explosion-Proof Equipment | Integer | items verified | Required (NEC 500/505) | — |
| Emergency Shutdown (ESD) | Enum | N/S / Installed / Tested | Required | — |
| Vent Stack / Flare | Enum | N/S / Installed / Tested | Required | — |
| Safety Distance Verified (NFPA 2) | Boolean | Y/N | Required | InspectionFirstPassRate |
| HV Power Cable | Number | LF | Required | CostPerInstallUnit |
| Substation / Transformer | Integer | units | Required | — |
| Switchgear / MCC | Integer | units | Required | — |
| PLC / SCADA | Integer | cabinets | Required | — |
| Grid Interconnection (if renewable) | Enum | N/A / In Progress / Energized | Required | — |