Energiepark Mainz

Germany

Overview

StatusOperational

Country · regionGermany

TechnologyPEM

ProductH2

Capacity6 MW

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)

Project Typehydrogen production facility

Status & timeline

Date online (tracker field)2017 (meaning under review)

Location & names

Site NameMainz-Hechtsheim

Official NameEnergiepark Mainz

Additional project information

Administrative AreaMainz

CountryGermany

Progress StatusOperational

Capacity (Announced Size)6 MW

Capacity (kt H2/y)0.9 kt H2/y

Capacity (Nm³ H₂/h)1,154 Nm³ H₂/h

Timeline

First production : 2015-07-02

Sources & record history

Sources

Mainzer Stadtwerke AG Mainzer Stadtwerke AG (https://www.mainzer-stadtwerke.de/aktuelles/aktuelle-meldungen/2025/08/energiepark-2)
Siemens AG Siemens AG (https://press.siemens.com/global/en/feature/kick-worlds-largest-electrolysis-system-mainz)
Landeshauptstadt Mainz Landeshauptstadt Mainz (https://www.mainz.de/microsite/klimaneutral/medien/bindata/260513_Bericht-KWP-Mainz-final.pdf)
H2Prism earlier record (SRC-C-P200)
International Energy Agency IEA Hydrogen Projects dataset Shared by 10 fields: Snapshot 2026-06-18 · Confidence: reported · Older value (2026)
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	Energiepark Mainz	View exact value `Energiepark Mainz`	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
Site Name	Mainz-Hechtsheim	View exact value `Mainz-Hechtsheim`	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
Country	Germany	View exact value `DEU`	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
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
Product	H2	View exact value `H2`	IEA Hydrogen Projects dataset	—	—
Project Type	hydrogen production facility	View exact value `hydrogen_production_facility`	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
Technology	PEM	View exact value `PEM`	IEA Hydrogen Projects dataset	—	—
Capacity	6 MW	View exact value `6 MW`	IEA Hydrogen Projects dataset	—	—
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
Event	Date online : 2017	View exact value `{"date":"2017","date_precision":"year","event":"Date online","basis":"iea_hydrogen_projects_raw.csv"}`	IEA Hydrogen Projects dataset	—	—
Progress Status	Operational	View exact value `Operational`	H2Prism earlier record (SRC-S3); H2Prism earlier record (SRC-S3)		Older value
Administrative Area	Mainz	View exact value `Mainz`	IEA Hydrogen Projects dataset	—	—
Country	Germany	View exact value `Germany`	IEA Hydrogen Projects dataset	—	—
Progress Status	Operational	View exact value `Operational`	IEA Hydrogen Projects dataset	—	—
Capacity (Announced Size)	6 MW	View exact value `6 MW`	IEA Hydrogen Projects dataset	—	—
Capacity (kt H2/y)	0.9 kt H2/y	View exact value `0.8995846153846152 kt H2/y`	IEA Hydrogen Projects dataset	—	—
Capacity (Nm³ H₂/h)	1,154 Nm³ H₂/h	View exact value `1153.8461538461538 Nm³ H₂/h`	IEA Hydrogen Projects dataset	—	—

Record history

0 current sourced values · 11 older values · Record updated 26 Sep 2026