ISO 50002-1:2025
(Main)Energy audits — Part 1: General requirements with guidance for use
Energy audits — Part 1: General requirements with guidance for use
This document specifies: — the principles of carrying out energy audits; — the process requirements for carrying out an energy audit in relation to energy performance; — the roles and responsibilities of the organization and the energy auditor; — deliverables for energy audits. It gives guidance on determining and/or evaluating the competence of the energy auditor. This document is applicable to any organization regardless of its size, complexity, geographical location, organizational culture or the products and services it provides, irrespective of the quantity, use or types of energy used. This document does not apply to selecting and evaluating the competence of bodies providing energy audit services. It also does not apply to auditing an organization’s energy management system (EnMS), as this is described in ISO 50003. Additional documents provide information guidance on applying the energy audit process to buildings (see ISO 50002-2), processes (see ISO 50002-3) and other applications or uses.
Audits énergétiques — Partie 1: Exigences et recommandations de mise en œuvre
General Information
Relations
Standards Content (Sample)
International
Standard
ISO 50002-1
First edition
Energy audits —
2025-06
Part 1:
General requirements with
guidance for use
Audits énergétiques —
Partie 1: Exigences et recommandations de mise en œuvre
Reference number
© ISO 2025
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principles of energy auditing . 6
4.1 General .6
4.2 Competency .6
4.3 Confidentiality .6
4.4 Objectivity .6
4.5 Access to equipment, resources and information .6
4.6 Evidence-based approach .6
4.7 Risk-based approach .7
4.8 Communication .7
5 Performing an energy audit . 7
5.1 General .7
5.2 Planning .8
5.3 Opening meeting .10
5.4 Data collection .11
5.5 Measurement plan . 12
5.6 Site visit . . 13
5.7 Analysis .14
5.7.1 General .14
5.7.2 Analysis of current energy performance .14
5.7.3 Identification of energy performance improvement opportunities .14
5.7.4 Evaluation of energy performance improvement opportunities . 15
5.7.5 Prioritization of energy performance improvement actions . . 15
5.8 Reporting .16
5.8.1 General .16
5.8.2 Report content .16
5.9 Closing meeting .17
6 Competence of the energy auditor .18
6.1 General .18
6.2 Generic competence of energy auditors .18
6.2.1 General .18
6.2.2 Energy audit principles, processes and methods .18
6.2.3 Energy audit standards and other references.18
6.2.4 Organization and its context .19
6.2.5 Applicable legal requirements and other requirements .19
6.3 Energy specific competence of energy auditors .19
6.4 Generic competence of a lead energy auditor . 20
Annex A (informative) Guidance on the use of this document .21
Annex B (informative) Applicability of this document to other International Standards .32
Annex C (informative) Sampling .36
Bibliography .37
iii
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 Technical Committee ISO/TC 301, Energy management and energy savings.
This first edition cancels and replaces ISO 50002:2014, which has been technically revised.
The main changes are as follows:
— the terms and definitions have been aligned with ISO 50001:2018;
— new principles have been added;
— decarbonization options have been included in improvement opportunities (renewable energy and
achievement of net zero);
— energy auditor competencies have been clarified.
A list of all parts in the ISO 50002 series can be found on the ISO website.
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
Introduction
0.1 Background
An energy audit comprises multiple yet interlinked activities and processes ranging from establishing the
scope of the energy audit, collecting and measuring the appropriate data, analysing the energy performance
of an organization, building(s), equipment, system(s) and/or process(es), site observations and using the
information to draw conclusions about energy performance improvement actions (EPIAs). The intended
result of energy audits is to use a structured and planned process to identify and prioritize EPIAs, which will
help reduce wasted energy and can obtain related environmental benefits.
Audit outputs include information on current energy use and performance, and they provide ranked
recommendations for improvement that are relevant and practicable. The benefits of carrying out an energy
audit include:
— reduced energy consumption;
— economic and financial benefits;
— reduced CO emissions and greenhouse gas (GHG) reduction arising from energy use;
2e
— related environmental benefits (e.g. air quality, water reduction);
— distribution of energy use and GHG emissions among various energy systems;
— benchmarking of energy use;
— assessment of energy performance of specific energy systems;
— other benefits (e.g. production efficiencies, maintenance, training).
0.2 ISO 50002series
The ISO 50002 series was revised using ISO 50002:2014 and EN 16247-1:2022 as the starting point. It allows
for differences in approach and in terms of scope, boundary and audit objective, and seeks to harmonize
common aspects of energy auditing in order to enhance clarity and transparency.
The ISO 50002 series includes the following parts:
— This document provides the principles and defines the common set of requirements for conducting
energy audits for buildings, equ
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