Gigastack-Hornsea 2, phase II
Overview
StatusFeasibilityGigastack consortium
Country · regionUnited KingdomDepartment for Business, Energy & Industrial Strategy / GOV.UK
TechnologyPEMInternational Energy Agency · as of 2026
ProductH2International Energy Agency · as of 2026
Capacity900 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.
Details
Technology & product
Componentselectrolyser (PEM)Department for Business, Energy & Industrial Strategy / GOV.UK
Project GroupGigastack (Phase 2)Department for Business, Energy & Industrial Strategy / GOV.UK
Project Typehydrogen production facilityDepartment for Business, Energy & Industrial Strategy / GOV.UK
Location & names
Site NamePhillips 66 Humber RefineryDepartment for Business, Energy & Industrial Strategy / GOV.UK
AliasGigastack-Hornsea 2, phase IIDepartment for Business, Energy & Industrial Strategy / GOV.UK
Official NameGigastack Phase 2Department for Business, Energy & Industrial Strategy / GOV.UK
Additional project information
Administrative AreaCost location close to Hornsea 2International Energy Agency · as of 2026
CountryUnited KingdomInternational Energy Agency · as of 2026
Progress StatusCancelledInternational Energy Agency · as of 2026
Capacity (Announced Size)1 GWInternational Energy Agency · as of 2026
Capacity (Nm³ H₂/h)173,077 Nm³ H₂/hInternational Energy Agency · as of 2026
Capacity (kt H2/y)135 kt H2/yInternational Energy Agency · as of 2026
Timeline
- FEED completed : 2021-11Gigastack consortium
- Suspension start : 2023-08-18Offshore Energy
Sources & record history
Sources
- IEA Hydrogen Projects dataset Shared by 10 fields: Snapshot 2026-06-18 · Confidence: reported · Older value (2026)
- Department for Business, Energy & Industrial Strategy / GOV.UK Department for Business, Energy & Industrial Strategy / GOV.UK (https://www.gov.uk/government/publications/hydrogen-supply-competition/hydrogen-supply-programme-successful-projects-phase-2)
- Gigastack consortium Gigastack consortium (https://gigastack.co.uk/about/)
- H2Prism earlier record (SRC-C-P200)
- Offshore Energy Offshore Energy (https://www.offshore-energy.biz/two-offshore-wind-to-hydrogen-projects-withdraw-from-uks-first-electrolytic-allocation-round/)
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 | Gigastack-Hornsea 2, phase II | View exact valueGigastack-Hornsea 2, phase II | IEA Hydrogen Projects dataset | — | — |
| Site Name | Phillips 66 Humber Refinery | View exact valuePhillips 66 Humber Refinery | Department for Business, Energy & Industrial Strategy / GOV.UK (https://www.gov.uk/government/publications/hydrogen-supply-competition/hydrogen-supply-programme-successful-projects-phase-2); Gigastack consortium (https://gigastack.co.uk/about/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Alias | Gigastack-Hornsea 2, phase II | View exact value[{"kind":"source_label","name":"Gigastack-Hornsea 2, phase II"}] | Department for Business, Energy & Industrial Strategy / GOV.UK (https://www.gov.uk/government/publications/hydrogen-supply-competition/hydrogen-supply-programme-successful-projects-phase-2); Gigastack consortium (https://gigastack.co.uk/about/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Country | United Kingdom | View exact valueGBR | Department for Business, Energy & Industrial Strategy / GOV.UK (https://www.gov.uk/government/publications/hydrogen-supply-competition/hydrogen-supply-programme-successful-projects-phase-2); Gigastack consortium (https://gigastack.co.uk/about/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Official Name | Gigastack Phase 2 | View exact value[{"lang":"en","name":"Gigastack Phase 2","evidence":["E-02"]}] | Department for Business, Energy & Industrial Strategy / GOV.UK (https://www.gov.uk/government/publications/hydrogen-supply-competition/hydrogen-supply-programme-successful-projects-phase-2); Gigastack consortium (https://gigastack.co.uk/about/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Components | electrolyser (PEM) | View exact value{"kind":"electrolyser","tech":"PEM","tech_raw":"polymer electrolyte membrane (PEM) electrolysers","component_id":"CMP-1"} | Department for Business, Energy & Industrial Strategy / GOV.UK (https://www.gov.uk/government/publications/hydrogen-supply-competition/hydrogen-supply-programme-successful-projects-phase-2); Gigastack consortium (https://gigastack.co.uk/about/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Product | H2 | View exact valueH2 | IEA Hydrogen Projects dataset | — | — |
| Project Group | Gigastack (Phase 2) | View exact value{"exists":true,"evidence":["E-02"],"group_name":"Gigastack","phase_name":"Phase 2","phase_order":2} | Department for Business, Energy & Industrial Strategy / GOV.UK (https://www.gov.uk/government/publications/hydrogen-supply-competition/hydrogen-supply-programme-successful-projects-phase-2); Gigastack consortium (https://gigastack.co.uk/about/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Project Type | hydrogen production facility | View exact valuehydrogen_production_facility | Department for Business, Energy & Industrial Strategy / GOV.UK (https://www.gov.uk/government/publications/hydrogen-supply-competition/hydrogen-supply-programme-successful-projects-phase-2); Gigastack consortium (https://gigastack.co.uk/about/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Technology | PEM | View exact valuePEM | IEA Hydrogen Projects dataset | — | — |
| Capacity | 900 MW | View exact value900 MW | IEA Hydrogen Projects dataset | — | — |
| Event | FEED completed : 2021-11 | View exact value{"date":"2021-11","tags":{"as_of":"2021-11","source":"Gigastack consortium website","evidence":["E-02"],"judged_by":"worker_review","confidence":"high","accessed_at":"2026-08-17T23:19:43Z"},"ev_type":"EV-03","event_id":"V-01","raw_date_text":"The Gigastack Phase 2 public report was completed and published in November 2021","date_precision":"month"} | Gigastack consortium (https://gigastack.co.uk/about/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Event | Suspension start : 2023-08-18 | View exact value{"date":"2023-08-18","tags":{"as_of":"2023-08-18","source":"Offshore Energy quoting Phillips 66 Ltd and Ørsted spokesperson","evidence":["E-03"],"judged_by":"worker_review","confidence":"medium","accessed_at":"2026-08-17T23:19:43Z"},"ev_type":"EV-15","event_id":"V-02","raw_date_text":"We have made a joint decision to withdraw our bid from the funding process and pause the Gigastack project.","date_precision":"day"} | Offshore Energy (https://www.offshore-energy.biz/two-offshore-wind-to-hydrogen-projects-withdraw-from-uks-first-electrolytic-allocation-round/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Progress Status | Feasibility | View exact valueFeasibility study | Gigastack consortium (https://gigastack.co.uk/about/); Offshore Energy (https://www.offshore-energy.biz/two-offshore-wind-to-hydrogen-projects-withdraw-from-uks-first-electrolytic-allocation-round/); H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200) | Older value | |
| Administrative Area | Cost location close to Hornsea 2 | View exact valueCost location close to Hornsea 2 | IEA Hydrogen Projects dataset | — | — |
| Country | United Kingdom | View exact valueUnited Kingdom | IEA Hydrogen Projects dataset | — | — |
| Progress Status | Cancelled | View exact valueCancelled | IEA Hydrogen Projects dataset | — | — |
| Capacity (Announced Size) | 1 GW | View exact value1 GW | IEA Hydrogen Projects dataset | — | — |
| Capacity (Nm³ H₂/h) | 173,077 Nm³ H₂/h | View exact value173076.9230769231 Nm³ H₂/h | IEA Hydrogen Projects dataset | — | — |
| Capacity (kt H2/y) | 135 kt H2/y | View exact value134.93769230769232 kt H2/y | IEA Hydrogen Projects dataset | — | — |
Record history
0 current sourced values · 13 older values · Record updated