H2 plant Data center
Overview
StatusConceptInternational Energy Agency · as of 2026
Country · regionUnited StatesInternational Energy Agency · as of 2026 · Mason County, West Virginia
TechnologyFidelisH2: natural gas, renewable energy and CCUS
ProductH2International Energy Agency · as of 2026
CapacityOver 500 metric tons per day per phase (four phases announced)
Capacity values retain their recorded units and scope. MW, kt H₂/y and Nm³ H₂/h are different measures; this page does not convert or add them without a shared operating basis. “Other Electrolysis” and “Unknown PtX” are recorded classifications, not a specific electrolyzer design or power-to-X route.
Details
Technology & product
Configuration DetailUnknown PtXInternational Energy Agency · as of 2026
Status & timeline
EventOn August 16, 2023, Fidelis New Energy announced Mason County, West Virginia as the site of its Mountaineer GigaSystem hydrogen facility and associated Monarch Cloud Campus data centers.
Location & names
Site NameMountaineer GigaSystem
Official NameMountaineer GigaSystem
Additional project information
Administrative AreaRandom location at West VirginiaInternational Energy Agency · as of 2026
TechnologyOther ElectrolysisInternational Energy Agency · as of 2026
Capacity (MWel)1,000 MWelInternational Energy Agency · as of 2026
Capacity (kt H2/y)173 kt H2/yInternational Energy Agency · as of 2026
Capacity (Nm³ H₂/h)222,222 Nm³ H₂/hInternational Energy Agency · as of 2026
Capacity (Announced Size)1 GWInternational Energy Agency · as of 2026
Timeline
No recorded project events.
Sources & record history
Sources
- IEA Hydrogen Projects dataset Shared by 11 fields: Snapshot 2026-06-18 · Confidence: reported · Older value (2026)
- Fidelis New Energy Fidelis New Energy Selects Mason County West Virginia for Lifecycle Carbon Neutral Hydrogen Project, Data Center Campus, and Greenhouse Complex Shared by 2 fields: Current
- West Virginia Economic Development Authority Mountaineer GigaSystem, LLC — Public Information High-Impact Development Project
Field sources
Shared date, confidence and value status appear once with their source above; a dash in the table refers to that source context.
| Field | Shown value | Original value | Source | Date basis | Meaning |
|---|---|---|---|---|---|
| Name | H2 plant Data center | View exact valueH2 plant Data center | IEA Hydrogen Projects dataset | — | — |
| Site Name | Mountaineer GigaSystem | View exact valueMountaineer GigaSystem | Fidelis New Energy Selects Mason County West Virginia for Lifecycle Carbon Neutral Hydrogen Project, Data Center Campus, and Greenhouse Complex; Mountaineer GigaSystem, LLC — Public Information High-Impact Development Project | Current | |
| Administrative Area | Mason County, West Virginia | View exact valueMason County, West Virginia | Fidelis New Energy Selects Mason County West Virginia for Lifecycle Carbon Neutral Hydrogen Project, Data Center Campus, and Greenhouse Complex; Mountaineer GigaSystem, LLC — Public Information High-Impact Development Project | Current | |
| Country | United States | View exact valueUnited States | IEA Hydrogen Projects dataset | — | — |
| Official Name | Mountaineer GigaSystem | View exact valueMountaineer GigaSystem | Fidelis New Energy Selects Mason County West Virginia for Lifecycle Carbon Neutral Hydrogen Project, Data Center Campus, and Greenhouse Complex; Mountaineer GigaSystem, LLC — Public Information High-Impact Development Project | Current | |
| Configuration Detail | Unknown PtX | View exact valueUnknown PtX | IEA Hydrogen Projects dataset | — | — |
| Product | H2 | View exact valueH2 | IEA Hydrogen Projects dataset | — | — |
| Technology | FidelisH2: natural gas, renewable energy and CCUS | View exact valueFidelisH2: natural gas, renewable energy and CCUS | Fidelis New Energy Selects Mason County West Virginia for Lifecycle Carbon Neutral Hydrogen Project, Data Center Campus, and Greenhouse Complex | — | |
| Capacity | Over 500 metric tons per day per phase (four phases announced) | View exact valueOver 500 metric tons per day per phase (four phases announced) | Fidelis New Energy Selects Mason County West Virginia for Lifecycle Carbon Neutral Hydrogen Project, Data Center Campus, and Greenhouse Complex | — | |
| Event | On August 16, 2023, Fidelis New Energy announced Mason County, West Virginia as the site of its Mountaineer GigaSystem hydrogen facility and associated Monarch Cloud Campus data centers. | View exact valueOn August 16, 2023, Fidelis New Energy announced Mason County, West Virginia as the site of its Mountaineer GigaSystem hydrogen facility and associated Monarch Cloud Campus data centers. | Fidelis New Energy Selects Mason County West Virginia for Lifecycle Carbon Neutral Hydrogen Project, Data Center Campus, and Greenhouse Complex; Mountaineer GigaSystem, LLC — Public Information High-Impact Development Project | Current | |
| Progress Status | Concept | View exact valueConcept | IEA Hydrogen Projects dataset | — | — |
| Administrative Area | Random location at West Virginia | View exact valueRandom location at West Virginia | IEA Hydrogen Projects dataset | — | — |
| Technology | Other Electrolysis | View exact valueOther Electrolysis | IEA Hydrogen Projects dataset | — | — |
| Capacity (MWel) | 1,000 MWel | View exact value1000 MWel | IEA Hydrogen Projects dataset | — | — |
| Capacity (kt H2/y) | 173 kt H2/y | View exact value173.25333333333333 kt H2/y | IEA Hydrogen Projects dataset | — | — |
| Capacity (Nm³ H₂/h) | 222,222 Nm³ H₂/h | View exact value222222.22222222225 Nm³ H₂/h | IEA Hydrogen Projects dataset | — | — |
| Capacity (Announced Size) | 1 GW | View exact value1GW | IEA Hydrogen Projects dataset | — | — |
Record history
6 current sourced values · 4 older values · Record updated