Hydrogen projects / Energiepark Mainz Overview Status Operational Source Landeshauptstadt Mainz Close
Country · region Germany Source Mainzer Stadtwerke AG Close Technology Water electrolysis Source European Clean Hydrogen Partnership · as of 2025 Close
Capacity 6 MW Source European Clean Hydrogen Partnership · as of 2025 Close
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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 Components Electrolyser (PEM) Source Mainzer Stadtwerke AG Close
Project Type hydrogen production facility Source Mainzer Stadtwerke AG Close
Location & names Site Name Mainz-Hechtsheim Source Mainzer Stadtwerke AG Close
Official Name Energiepark Mainz Source Mainzer Stadtwerke AG Close
Timeline First production : 2015-07-02 Source Siemens AG Close Sources & record history Sources 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 Energiepark Mainz View exact value Energiepark MainzMainzer Stadtwerke AG (https://www.mainzer-stadtwerke.de/aktuelles/aktuelle-meldungen/2025/08/energiepark-2) ; Siemens AG (https://press.siemens.com/global/en/feature/kick-worlds-largest-electrolysis-system-mainz) ; Landeshauptstadt Mainz (https://www.mainz.de/microsite/klimaneutral/medien/bindata/260513_Bericht-KWP-Mainz-final.pdf) ; H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200)Older value Site Name Mainz-Hechtsheim View exact value Mainz-HechtsheimMainzer Stadtwerke AG (https://www.mainzer-stadtwerke.de/aktuelles/aktuelle-meldungen/2025/08/energiepark-2) ; Siemens AG (https://press.siemens.com/global/en/feature/kick-worlds-largest-electrolysis-system-mainz) ; Landeshauptstadt Mainz (https://www.mainz.de/microsite/klimaneutral/medien/bindata/260513_Bericht-KWP-Mainz-final.pdf) ; H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200)Older value Country Germany View exact value DEUMainzer Stadtwerke AG (https://www.mainzer-stadtwerke.de/aktuelles/aktuelle-meldungen/2025/08/energiepark-2) ; Siemens AG (https://press.siemens.com/global/en/feature/kick-worlds-largest-electrolysis-system-mainz) ; Landeshauptstadt Mainz (https://www.mainz.de/microsite/klimaneutral/medien/bindata/260513_Bericht-KWP-Mainz-final.pdf) ; H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200)Older value Official Name Energiepark Mainz View exact value [{"lang":"de","name":"Energiepark Mainz","evidence":["E-01"]}]Mainzer Stadtwerke AG (https://www.mainzer-stadtwerke.de/aktuelles/aktuelle-meldungen/2025/08/energiepark-2) ; Siemens AG (https://press.siemens.com/global/en/feature/kick-worlds-largest-electrolysis-system-mainz) ; Landeshauptstadt Mainz (https://www.mainz.de/microsite/klimaneutral/medien/bindata/260513_Bericht-KWP-Mainz-final.pdf) ; H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200)Older value Components Electrolyser (PEM) View exact value {"kind":"전해조","tech":"PEM","tech_raw":"highly dynamic PEM high-pressure electrolysis","component_id":"CMP-1"}Mainzer Stadtwerke AG (https://www.mainzer-stadtwerke.de/aktuelles/aktuelle-meldungen/2025/08/energiepark-2) ; Siemens AG (https://press.siemens.com/global/en/feature/kick-worlds-largest-electrolysis-system-mainz) ; Landeshauptstadt Mainz (https://www.mainz.de/microsite/klimaneutral/medien/bindata/260513_Bericht-KWP-Mainz-final.pdf) ; H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200)Older value Project Type hydrogen production facility View exact value hydrogen_production_facilityMainzer Stadtwerke AG (https://www.mainzer-stadtwerke.de/aktuelles/aktuelle-meldungen/2025/08/energiepark-2) ; Siemens AG (https://press.siemens.com/global/en/feature/kick-worlds-largest-electrolysis-system-mainz) ; Landeshauptstadt Mainz (https://www.mainz.de/microsite/klimaneutral/medien/bindata/260513_Bericht-KWP-Mainz-final.pdf) ; H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200)Older value Technology Water electrolysis View exact value Water electrolysisEuropean Hydrogen Observatory projects Dec2025 — — Capacity 6 MW View exact value 6 MWEuropean Hydrogen Observatory projects Dec2025 — — Event First production : 2015-07-02 View exact value {"date":"2015-07-02","tags":{"as_of":"2015-07-02","source":"Siemens feature","evidence":["E-04"],"judged_by":"transcription","confidence":"high","accessed_at":"2026-08-17T17:56:35Z"},"ev_type":"EV-12","event_id":"V-01","raw_date_text":"officially launched a hydrogen production plant at the Energiepark Mainz on July 2, 2015","date_precision":"day"}Siemens AG (https://press.siemens.com/global/en/feature/kick-worlds-largest-electrolysis-system-mainz) ; H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200)Older value Progress Status Operational View exact value OperationalLandeshauptstadt Mainz (https://www.mainz.de/microsite/klimaneutral/medien/bindata/260513_Bericht-KWP-Mainz-final.pdf) ; Mainzer Stadtwerke AG (https://www.mainzer-stadtwerke.de/aktuelles/aktuelle-meldungen/2020/10/energiepark-besuch-durch-olaf-scholz) ; H2Prism earlier record (SRC-C-P200); H2Prism earlier record (SRC-C-P200)Older value
Record history 0 current sourced values · 9 older values · Record updated 26 Sep 2026