HyMarnham
Overview
StatusOperationalH2Prism earlier record
Country · regionUnited KingdomHyMarnham Power
TechnologyOther ElectrolysisInternational Energy Agency · as of 2026
ProductH2International Energy Agency · as of 2026
Capacity15 MWInternational Energy Agency · as of 2026
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
Componentselectrolyser (ALK)HyMarnham Power
Configuration DetailUnknown PtXInternational Energy Agency · as of 2026
Power SourceElectricity from a range of local sources, including a nearby biomass CHP plant (July 2025 announcement)
Project Typehydrogen production facilityHyMarnham Power
Capacity & economics
Total Capex50 million GBP project costHyMarnham Power
Status & timeline
EventAs of the 23 July 2025 announcement, GeoPura reported HyMarnham Power was already producing hydrogen while electrolyser commissioning was underway
Date online (tracker field)2026 (meaning under review)International Energy Agency · as of 2026
Location & names
Site Nameformer High Marnham coal-fired power station siteHyMarnham Power
AliasHyMarnhamHyMarnham Power
Official NameHyMarnham PowerHyMarnham Power
Additional project information
Administrative AreaNewarkInternational Energy Agency · as of 2026
CountryUnited KingdomInternational Energy Agency · as of 2026
Progress StatusFID / ConstructionInternational Energy Agency · as of 2026
Capacity (Announced Size)15 MWInternational Energy Agency · as of 2026
Capacity (kt H2/y)2.6 kt H2/yInternational Energy Agency · as of 2026
Capacity (Nm³ H₂/h)3,333 Nm³ H₂/hInternational Energy Agency · as of 2026
Timeline
- Construction start : 2024-09HyMarnham Power
- Commercial operation : 2026-04Department for Energy Security and Net Zero
Sources & record history
Sources
- IEA Hydrogen Projects dataset Shared by 12 fields: Snapshot 2026-06-18 · Confidence: reported · Older value (2026)
- HyMarnham Power HyMarnham Power (https://hymarnhampower.com/about-us/)
- H2Prism earlier record (SRC-C-P200)
- GeoPura GeoPura and JG Pears Reach Major Infrastructure Milestone at HyMarnham Power Project Shared by 2 fields: Current
- Department for Energy Security and Net Zero Department for Energy Security and Net Zero (https://assets.publishing.service.gov.uk/media/6a16b44e29bb11891b1cf18a/flexibility-in-electrolytic-hydrogen-call-for-evidence.pdf)
- H2Prism earlier record (SRC-S3)
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 | HyMarnham | View exact valueHyMarnham | IEA Hydrogen Projects dataset | — | — |
| Site Name | former High Marnham coal-fired power station site | View exact valueformer High Marnham coal-fired power station site | HyMarnham Power (https://hymarnhampower.com/about-us/); HyMarnham Power (https://hymarnhampower.com/about-us/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Alias | HyMarnham | View exact value[{"kind":"source_label","name":"HyMarnham"}] | HyMarnham Power (https://hymarnhampower.com/about-us/); HyMarnham Power (https://hymarnhampower.com/about-us/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Country | United Kingdom | View exact valueGBR | HyMarnham Power (https://hymarnhampower.com/about-us/); HyMarnham Power (https://hymarnhampower.com/about-us/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Official Name | HyMarnham Power | View exact value[{"lang":"en","name":"HyMarnham Power","evidence":["E-01"]}] | HyMarnham Power (https://hymarnhampower.com/about-us/); HyMarnham Power (https://hymarnhampower.com/about-us/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Components | electrolyser (ALK) | View exact value{"kind":"electrolyser","tech":"ALK","tech_raw":"production of hydrogen gas by alkaline electrolysis of water","component_id":"CMP-1"} | HyMarnham Power (https://hymarnhampower.com/about-us/); HyMarnham Power (https://hymarnhampower.com/about-us/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Configuration Detail | Unknown PtX | View exact valueUnknown PtX | IEA Hydrogen Projects dataset | — | — |
| Power Source | Electricity from a range of local sources, including a nearby biomass CHP plant (July 2025 announcement) | View exact valueElectricity from a range of local sources, including a nearby biomass CHP plant (July 2025 announcement) | GeoPura and JG Pears Reach Major Infrastructure Milestone at HyMarnham Power Project | — | |
| Product | H2 | View exact valueH2 | IEA Hydrogen Projects dataset | — | — |
| Project Type | hydrogen production facility | View exact valuehydrogen_production_facility | HyMarnham Power (https://hymarnhampower.com/about-us/); HyMarnham Power (https://hymarnhampower.com/about-us/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Technology | Other Electrolysis | View exact valueOther Electrolysis | IEA Hydrogen Projects dataset | — | — |
| Capacity | 15 MW | View exact value15 MW | IEA Hydrogen Projects dataset | — | — |
| Total Capex | 50 million GBP project cost | View exact value{"unit":"million GBP","number":50,"of_what":"project cost","raw_text":"Our £50 million project"} | HyMarnham Power (https://hymarnhampower.com/about-us/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Event | Construction start : 2024-09 | View exact value{"date":"2024-09","tags":{"as_of":"2024-09","source":"HyMarnham Power","evidence":["E-04"],"judged_by":"transcription","confidence":"high","accessed_at":"2026-08-18T03:00:00Z"},"ev_type":"EV-10","event_id":"V-01","raw_date_text":"September 2024 ... Construction to transform the brownfield site into a clean energy hub","date_precision":"month"} | HyMarnham Power (https://hymarnhampower.com/about-us/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Event | Commercial operation : 2026-04 | View exact value{"date":"2026-04","tags":{"as_of":"2026-04","source":"Department for Energy Security and Net Zero","evidence":["E-05"],"judged_by":"transcription","confidence":"high","accessed_at":"2026-08-18T03:00:00Z"},"ev_type":"EV-13","event_id":"V-02","raw_date_text":"HyMarnham Power, beginning commercial operations in April 2026","date_precision":"month"} | Department for Energy Security and Net Zero (https://assets.publishing.service.gov.uk/media/6a16b44e29bb11891b1cf18a/flexibility-in-electrolytic-hydrogen-call-for-evidence.pdf); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Event | As of the 23 July 2025 announcement, GeoPura reported HyMarnham Power was already producing hydrogen while electrolyser commissioning was underway | View exact valueAs of the 23 July 2025 announcement, GeoPura reported HyMarnham Power was already producing hydrogen while electrolyser commissioning was underway | GeoPura and JG Pears Reach Major Infrastructure Milestone at HyMarnham Power Project | — | |
| Event | Date online : 2026 | View exact value{"date":"2026","date_precision":"year","event":"Date online","basis":"iea_hydrogen_projects_raw.csv"} | IEA Hydrogen Projects dataset | — | — |
| Progress Status | Operational | View exact valueOperational | H2Prism earlier record (SRC-S3); H2Prism earlier record (SRC-S3) | Older value | |
| Administrative Area | Newark | View exact valueNewark | IEA Hydrogen Projects dataset | — | — |
| Country | United Kingdom | View exact valueUnited Kingdom | IEA Hydrogen Projects dataset | — | — |
| Progress Status | FID / Construction | View exact valueFID/Construction | IEA Hydrogen Projects dataset | — | — |
| Capacity (Announced Size) | 15 MW | View exact value15MW | IEA Hydrogen Projects dataset | — | — |
| Capacity (kt H2/y) | 2.6 kt H2/y | View exact value2.5988 kt H2/y | IEA Hydrogen Projects dataset | — | — |
| Capacity (Nm³ H₂/h) | 3,333 Nm³ H₂/h | View exact value3333.3333333333335 Nm³ H₂/h | IEA Hydrogen Projects dataset | — | — |
Record history
2 current sourced values · 15 older values · Record updated