ISO 50046-2019 PDF

Full title and description

ISO 50046:2019 — General methods for predicting energy savings. This International Standard specifies general, measure‑based (bottom‑up / energy performance improvement actions, EPIAs) methods to calculate predicted energy savings (PrES), and provides guidance on method selection, documentation, validation and quality assurance for predicted savings across sectors and levels of aggregation.

Abstract

This document describes general methods for calculating predicted energy savings (PrES) using measure‑based calculation methods (EPIA‑based or bottom‑up). It excludes indicator‑based and total‑consumption‑based approaches (covered elsewhere) and gives principles for choosing appropriate methods according to context, required accuracy and available resources. It covers calculation of PrES for any end‑use, sector, measure type and stakeholder, and allows results to be expressed in primary or final (delivered) energy.

General information

• Status: Published (International Standard; confirmed in ISO systematic review process).
• Publication date: February 2019.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 27.015 — Energy efficiency. Energy conservation in general.
• Edition / version: Edition 1 (2019‑02).
• Number of pages: 53 (ISO edition).

Key bibliographic and status information above is taken from the ISO bibliographic record for ISO 50046:2019 and corroborated by national adopters and standards sellers.

Scope

ISO 50046:2019 applies to the calculation of predicted energy savings (PrES) using measure‑based methods (bottom‑up, EPIA‑based). It does not cover indicator‑based calculation methods or total‑consumption (top‑down) methods; those are treated in other standards. The standard is applicable to any type of energy performance improvement action, any energy end‑use, any sector and any aggregation level (individual measures up to programmes or policies), and describes how to calculate PrES over a defined prediction period in terms of primary or delivered energy.

Key topics and requirements

• Definition and classification of measure‑based (EPIA) approaches for predicted energy savings.
• Guidance on selecting an appropriate calculation method based on context, target accuracy and available data/resources.
• Requirements for baselines, unit savings, adjustments (e.g., for weather, activity), and aggregation of measure effects.
• Documentation, transparency, quality assurance and validation practices to ensure reproducible and credible PrES results.
• Statement of exclusions (indicator‑based and total‑consumption methods) and cross‑references to related ISO standards for those methods.

Typical use and users

Typical users include energy managers, energy auditors, evaluators, energy service companies (ESCOs), equipment and technology suppliers, programme designers, policy makers and analysts who need standardized methods to estimate the expected energy savings from discrete measures, projects or aggregated programmes. The standard is used for ex‑ante (predicted) savings calculations and to support planning, cost‑benefit analysis, reporting and funding decisions.

Related standards

Standards directly referenced or commonly used alongside ISO 50046 include: ISO 17742 (energy efficiency and savings calculation — indicator‑ and measure‑based approaches), ISO 50047 (determination of energy savings in organisations), ISO 17743 (methodological framework for calculation and reporting on energy savings) and terminology/units standards referenced in the ISO suite. These documents supply complementary methods, reporting rules and definitions used with ISO 50046.

Keywords

Predicted energy savings, PrES, measure‑based methods, bottom‑up, EPIA, energy savings calculation, baseline, validation, energy auditing, energy management.

FAQ

Q: What is this standard?

A: ISO 50046:2019 is an ISO International Standard that specifies general methods for predicting energy savings using measure‑based (EPIA / bottom‑up) calculation approaches.

Q: What does it cover?

A: It covers principles, method selection, calculation rules and quality requirements for computing predicted energy savings from specific measures, actions, programmes or policies. It explicitly excludes indicator‑based and total‑consumption top‑down methods (covered in other ISO standards).

Q: Who typically uses it?

A: Energy managers, auditors, ESCOs, programme designers, policy makers and evaluators who need standardized, transparent methods to estimate ex‑ante (predicted) energy savings for projects or aggregated initiatives.

Q: Is it current or superseded?

A: ISO 50046:2019 was published in February 2019 (Edition 1). It is an active International Standard and is subject to ISO's periodic review process (standards are reviewed at least every 5 years); its ISO bibliographic record shows it as published/confirmed in the ISO lifecycle. Users should check the ISO catalogue or their national standards body for any amendments or newer editions.

Q: Is it part of a series?

A: Yes — ISO 50046 is part of the broader ISO work programme on energy savings and energy management. It is intended to be used alongside related standards such as ISO 17742 (indicator‑ and measure‑based calculation methods), ISO 50047 (determination of energy savings in organisations) and ISO 17743 (methodological framework).

Q: What are the key keywords?

A: Predicted energy savings (PrES), measure‑based, bottom‑up, EPIA, baseline, unit savings, validation, energy savings calculation, energy efficiency.