oSIST prEN ISO 19870-1:2025
(Main)Hydrogen technologies - Methodology for determining the greenhouse gas emissions associated with the hydrogen supply chain - Part 1: Emissions associated with the production of hydrogen to production gate (ISO/DIS 19870-1:2025)
Hydrogen technologies - Methodology for determining the greenhouse gas emissions associated with the hydrogen supply chain - Part 1: Emissions associated with the production of hydrogen to production gate (ISO/DIS 19870-1:2025)
ISO 14044 requires the goal and scope of an LCA to be clearly defined and be consistent with the intended application. Due to the iterative nature of LCA, it is possible that the LCA scope needs to be refined during the study.
This document specifies methodologies that can be applied to determine the carbon footprint of a product (CFP) or partial CFP of a hydrogen product in line with ISO 14067. The goals and scopes of the methodologies correspond to either approach a) or b), given below, that ISO 14040:2006, A.2 gives as two possible approaches to LCA.
a) An approach that assigns elementary flows and potential environmental impacts to a specific product system, typically as an account of the history of the product.
b) An approach that studies the environmental consequences of possible (future) changes between alternative product systems.
Approaches a) and b) have become known as attributional and consequential, respectively, with complementary information accessible in the ILCD handbook.[1]
There are numerous pathways to produce hydrogen from various primary energy sources. This document describes the requirements and evaluation methods applied to several hydrogen production pathways of interest: electrolysis, steam methane reforming (with carbon capture and storage), co-production and coal gasification (with carbon capture and storage), auto-thermal reforming (with carbon capture and storage), hydrogen as a co-product in industrial applications and hydrogen from biomass waste as feedstock.
This document also considers the GHG emissions due to the conditioning or conversion of hydrogen into different physical forms and chemical carriers:
— hydrogen liquefaction;
— production, transport and cracking of ammonia as a hydrogen carrier;
— hydrogenation, transport and dehydrogenation of liquid organic hydrogen carriers (LOHCs).
This document considers the GHG emissions due to hydrogen and/or hydrogen carriers’ transport up to the consumption gate.
It is possible that future revisions of this document will consider additional hydrogen production, conditioning, conversion and transport methods.
This document applies to and includes every delivery along the supply chain up to the final delivery to the consumption gate (see Figure 2 in the Introduction).
This document also provides additional information related to evaluation principles, system boundaries and expected reported metrics in the form of Annexes A to K, that are accessible via the online ISO portal (https://standards.iso.org/iso/ts/19870/ed-1/en).
Technologies de l'hydrogène - Méthodologie pour déterminer les émissions de gaz à effet de serre associées à la chaîne d'approvisionnement en hydrogène - Partie 1: Émissions associées à la production d'hydrogène jusqu'au point de production (ISO/DIS 19870-1:2025)
[Not translated]
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2025
[Not translated]
Hydrogen technologies - Methodology for determining the greenhouse gas emissions
associated with the hydrogen supply chain - Part 1: Emissions associated with the
production of hydrogen to production gate (ISO/DIS 19870-1:2025)
Technologies de l'hydrogène - Méthodologie pour déterminer les émissions de gaz à
effet de serre associées à la chaîne d'approvisionnement en hydrogène - Partie 1:
Émissions associées à la production d'hydrogène jusqu'au point de production (ISO/DIS
19870-1:2025)
Ta slovenski standard je istoveten z: prEN ISO 19870-1
ICS:
13.020.40 Onesnaževanje, nadzor nad Pollution, pollution control
onesnaževanjem in and conservation
ohranjanje
27.075 Tehnologija vodika Hydrogen technologies
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
International
Standard
ISO/DIS 19870-1
ISO/TC 197/SC 1
Hydrogen technologies —
Secretariat: SCC
Methodology for determining
Voting begins on:
the greenhouse gas emissions
2025-05-05
associated with the hydrogen
Voting terminates on:
supply chain —
2025-07-28
Part 1:
Emissions associated with
the production of hydrogen to
production gate
ICS: 27.075; 13.020.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
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This document is circulated as received from the committee secretariat.
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Reference number
ISO/DIS 19870-1:2025(en)
DRAFT
ISO/DIS 19870-1:2025(en)
International
Standard
ISO/DIS 19870-1
ISO/TC 197/SC 1
Hydrogen technologies —
Secretariat: SCC
Methodology for determining
Voting begins on:
the greenhouse gas emissions
associated with the hydrogen
Voting terminates on:
supply chain —
Part 1:
Emissions associated with
the production of hydrogen to
production gate
ICS: 27.075; 13.020.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
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Published in Switzerland Reference number
ISO/DIS 19870-1:2025(en)
ii
ISO/DIS 19870-1:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 2
3.1 Quantification of the Carbon Footprint of a Product .2
3.2 Products, product systems and processes .4
3.3 Life Cycle Assessment .8
3.4 Organizations .11
3.5 Data and Data Quality .11
3.6 Abbreviated Terms . 12
4 Evaluation Methods .12
4.1 Evaluation Basis . 12
4.1.1 General Principles . 12
4.1.2 Attributional approach . 13
4.1.3 Consequential approach . 13
4.2 Product reporting .14
4.2.1 Product System Boundary .14
4.2.2 Selected Cut-Off Criteria . 15
4.2.3 Evaluation Elements . 15
4.2.4 Evaluation cycle .16
4.3 Quantification of GHG emissions .16
4.3.1 Process description and data quality .16
4.3.2 Emissions inventory .17
4.3.3 Emissions allocation . 22
4.4 CFP study report . 26
5 Critical review .26
Annex A (Normative) Hydrogen Purity .27
Annex B (informative) Consequential Approach—Examples for Hydrogen Production .31
Annex C Feedstocks for Hydrogen Production .35
Annex D Hydrogen Production Pathway – Methane Reforming (with or without Carbon Capture
and Storage) .42
Annex E Hydrogen Production Pathway – Water Electrolysis .58
Annex F Hydrogen Production Pathway – Chlor-alkali .63
Annex G Hydrogen Production Pathway – Steam cracking .70
Annex H Hydrogen Production Pathway – Gasification with or without carbon capture .77
Annex I Hydrogen Production Pathway – Methane pyrolysis .85
Annex J Hydrogen Production Pathway – Chemical Looping Water Splitting with or without
carbon capture .93
Annex K Hydrogen Production Pathway – Geologic Hydrogen Production .100
Annex L Hydrogen Production Pathway – Catalytic Naphtha Reforming .110
Bibliography .116
iii
ISO/DIS 19870-1:2025(en)
Foreword
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This document was prepared by Technical Committee ISO/TC 197, Hydrogen technologies, Subcommittee SC
1, Hydrogen at scale and horizontal energy systems.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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