SIST EN ISO 24078:2025
(Main)Hydrogen in energy systems - Vocabulary (ISO 24078:2025)
Hydrogen in energy systems - Vocabulary (ISO 24078:2025)
This document establishes the terms, definitions, symbols and abbreviations used in the fields related to hydrogen in energy systems.
This document is not applicable to the following fields:
— biological methanation,
— reactors for hydrogen production from other sources,
— road, maritime and aviation transport,
— aeronautics and space.
Note These fields are foreseen to be covered in future editions of this document.
This document does not apply to carbon capture, storage and utilisation, as well as services.
Wasserstoff in Energiesystemen - Vokabular (ISO 24078:2025)
Hydrogène dans les systèmes énergétiques - Vocabulaire (ISO 24078:2025)
Le présent document établit les termes, définitions, symboles et abréviations utilisés dans les domaines liés à l'hydrogène dans les systèmes énergétiques.
Le présent document ne s'applique pas aux domaines suivants:
— méthanisation naturelle;
— réacteur destiné à la production d'hydrogène à partir d'autres sources;
— transport routier, maritime et aérien;
— aéronautique et spatial.
Note Il est prévu que ces domaines soient couverts dans des éditions futures du présent document.
Le présent document ne s'applique pas à la séquestration et au stockage de carbone et à son utilisation, ni aux services.
Vodik v energijskih sistemih - Slovar (ISO 24078:2025)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2025
Vodik v energijskih sistemih - Slovar (ISO 24078:2025)
Hydrogen in energy systems - Vocabulary (ISO 24078:2025)
Wasserstoff in Energiesystemen - Vokabular (ISO 24078:2025)
Hydrogène dans les systèmes énergétiques - Vocabulaire (ISO 24078:2025)
Ta slovenski standard je istoveten z: EN ISO 24078:2025
ICS:
01.040.27 Prenos energije in toplote Energy and heat transfer
(Slovarji) engineering (Vocabularies)
27.075 Tehnologija vodika Hydrogen technologies
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 24078
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2025
EUROPÄISCHE NORM
ICS 27.075; 01.040.27
English Version
Hydrogen in energy systems - Vocabulary (ISO
24078:2025)
Hydrogène dans les systèmes énergétiques - Wasserstoff in Energiesystemen - Vokabular (ISO
Vocabulaire (ISO 24078:2025) 24078:2025)
This European Standard was approved by CEN on 24 June 2025.
CEN and CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical
references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to
any CEN and CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN and CENELEC member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austria, Belgium,
Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia,
Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 24078:2025 E
CEN/CENELEC worldwide for CEN national Members and for CENELEC Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 24078:2025) has been prepared by Technical Committee ISO/TC 197
"Hydrogen technologies" in collaboration with Technical Committee CEN-CENELEC/ JTC 6 “Hydrogen in
energy systems” the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by January 2026, and conflicting national standards shall
be withdrawn at the latest by January 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN-CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN and CENELEC
websites.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 24078:2025 has been approved by CEN-CENELEC as EN ISO 24078:2025 without any
modification.
International
Standard
ISO 24078
First edition
Hydrogen in energy systems —
2025-06
Vocabulary
Hydrogène dans les systèmes énergétiques — Vocabulaire
Reference number
ISO 24078:2025(en) © ISO 2025
ISO 24078:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
ISO 24078:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Energy .1
3.2 Energy system and market .5
3.3 Electric Power Network .9
3.4 Hydrogen production system .10
3.5 Hydrogen production equipment . 13
3.6 Hydrogen infrastructure .14
3.6.1 General .14
3.6.2 Components . 15
3.6.3 Stations and plants .16
3.7 Hydrogen storage .17
3.8 Hydrogen fuelled heat and power generation devices .19
3.9 Hydrogen-to-X . 22
3.10 Gas mixture . 23
3.11 Safety. 25
3.12 Risk reduction measure .27
3.13 Hydrogen detection .31
3.14 Metrology .31
3.15 Quality of energy carriers .32
3.16 Testing . 34
3.17 Certification . 35
3.18 Materials compatibility . . 36
Bibliography .38
Index .42
iii
ISO 24078:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by ISO TC 197, Hydrogen Technologies, in collaboration with Technical
Committee CEN-CENELEC/JTC 6, Hydrogen in Energy Systems, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO 24078:2025(en)
Introduction
In this document, terms and definitions have been identified, reviewed and proposed to cover technical
aspects for hydrogen
...
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