ISO 50002-1-2025 PDF

Full title and description

St ISO 50002-1-2025 — Energy audits — Part 1: General requirements with guidance for use. This international standard defines general requirements, principles and practical guidance for planning, conducting, reporting and following up energy audits across buildings, processes, systems and transport. It establishes a consistent, scalable audit methodology (including audit levels) to identify opportunities for improving energy performance and to support integration with energy management systems such as ISO 50001.

Abstract

ISO 50002-1:2025 provides a structured framework for energy audits, covering the audit process from initiation and planning through data collection, analysis, measurement and verification, reporting and recommendations. The document sets out competence expectations for auditors, defines common audit levels (walk-through, detailed survey, comprehensive analysis), and offers guidance on applying audit results to prioritize energy-saving measures, estimate savings and support organisational decision-making and decarbonization strategies. It replaces ISO 50002:2014 and is designed to be used standalone or alongside ISO 50001 and related energy management standards.

General information

• Status: Published
• Publication date: June 2, 2025
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 27.015 (Energy conservation, energy management)
• Edition / version: Edition 1 (2025)
• Number of pages: 37

Scope

The standard specifies principles and process requirements for carrying out energy audits in relation to energy performance. It applies to organisations of any size, type or sector and covers audits performed as standalone activities or as part of an energy management system. The scope includes audit planning, determination of audit level and boundaries, data collection and metering, development and use of energy performance indicators and baselines, analysis and quantification of opportunities, reporting, and recommendations for measurement and verification and follow-up.

Key topics and requirements

• Definition of audit objectives, scope, boundaries and levels (Level 1: walk-through; Level 2: detailed survey; Level 3: comprehensive technical analysis)
• Audit planning and stakeholder engagement, including roles and responsibilities
• Requirements for data collection, energy accounting and use of EnPIs and EnBs
• Guidance on measurement, monitoring and verification (M&V) approaches and uncertainty assessment
• Competence, qualifications and impartiality expectations for auditors and audit teams
• Analysis methods to identify and evaluate energy-saving opportunities and estimate potential savings and payback
• Reporting content and presentation of findings, recommendations and prioritized action plans
• Integration with ISO 50001 energy reviews and linkage to energy management processes
• Consideration of lifecycle, decarbonization and non-energy benefits where relevant

Typical use and users

Used by energy managers, internal audit teams, external energy auditors and consultants, energy service companies (ESCOs), facility and operations managers, sustainability and capital-investment decision makers, regulators and policy bodies. It is suitable for organisations commissioning audits, organisations conducting internal audits to inform energy management, and training/education programmes for energy professionals.

Related standards

Frequently used alongside or referenced with: ISO 50001 (Energy management systems), ISO 50002-2:2025 (energy audits — guidance for buildings), ISO 50002-3:2025 (energy audits — guidance for processes), ISO 50003 (requirements for bodies providing audit and certification of energy management systems), ISO 50004 (guidance for implementing an EnMS), ISO 50006 (energy performance indicators and baselines) and ISO 50015 (measurement and verification of energy performance). It formally replaces ISO 50002:2014.

Keywords

energy audit, ISO 50002-1:2025, EnPI, energy baseline, M&V, energy performance, audit levels, energy management, ISO 50001, energy efficiency, decarbonization, ESCO, auditor competence

FAQ

Q: What is this standard?

A: ISO 50002-1:2025 is an international standard that specifies general requirements and guidance for conducting energy audits to assess and improve organisational energy performance.

Q: What does it cover?

A: It covers audit planning, determination of audit level and boundaries, data collection and analysis, use of energy performance indicators and baselines, measurement and verification guidance, auditor competence, reporting and follow-up actions to prioritize energy-saving opportunities.

Q: Who typically uses it?

A: Energy managers, internal and external auditors, consultants, ESCOs, facility managers, sustainability teams, and organisations seeking to identify cost-effective energy and carbon reduction measures or to support ISO 50001 processes.

Q: Is it current or superseded?

A: It is current. ISO 50002-1:2025 was published on June 2, 2025 and replaces the previous ISO 50002:2014 edition.

Q: Is it part of a series?

A: Yes. It is Part 1 of the ISO 50002 series; companion parts provide detailed guidance for specific sectors (for example, Part 2 for buildings and Part 3 for processes) and the series complements the ISO 50000-family (ISO 50001, ISO 50003, ISO 50004, ISO 50006, ISO 50015, etc.).

Q: What are the key keywords?

A: Energy audit, energy performance, EnPI, EnB, measurement and verification, audit levels, ISO 50002-1, energy management, energy efficiency, auditor competence.