ISO 50049:2020
Calculation methods for energy efficiency and energy consumption variations at country, region and city levels
This document gives guidelines for methods for analysing changes in energy efficiency and energy consumption, and for measuring energy efficiency progress, for countries, regions and cities. It is composed of three different calculation methods:
— evaluation of structure effects in the variation of energy intensity;
— calculation of energy efficiency indices;
— decomposition analysis of energy consumption variation.
This document is applicable to providing an aggregated statistical evaluation for a country, region or city. It does not apply to calculating changes in the energy consumption or in energy efficiency at the individual consumer's level (e.g. households, organizations, companies).
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Factors to be calculated
4.1 General
4.1.1 Overview of methods included in the document
4.1.2 Objectives of calculations
4.1.3 Types of explanatory factors to be calculated
4.2 Indicators, methods and applications
4.2.1 Indicators
4.2.2 Types of data used
4.2.3 Structure effects
4.2.4 Indicator choice for energy efficiency and energy savings calculation
4.2.5 Climatic corrections of energy consumption
5 Evaluation of structure effects in the variation of energy intensity
5.1 General
5.2 Calculation methods
5.2.1 Introduction to the calculation of structure effect
5.2.2 Decomposition of the energy intensity variation with the Divisia method
5.3 Calculation issues related to structure effects
5.3.1 General
5.3.2 Options of calculation of the Divisia decomposition
5.3.3 Disaggregation level
5.3.4 Chained or unchained calculation
6 Calculation of energy efficiency indices
6.1 Objective and overview of calculation
6.2 General calculation
6.2.1 General
6.2.2 Step 1: Selection of subsectors or energy uses
6.2.3 Step 2: Choice of indicators
6.2.4 Step 3: Calculation of indicator values
6.2.5 Step 4: Calculation of indicator trends as index
6.2.6 Step 5: Calculation of weighting factors
6.2.7 Step 6: Calculation of energy efficiency indices by sector
6.2.8 Step 7: Calculation of an overall energy efficiency index
6.3 Computational issues in the calculation of the energy efficiency indices
6.3.1 General
6.3.2 Options for calculation
6.3.3 Indicators resulting in negative energy efficiency improvement
6.4 Reliability of energy efficiency indices
6.4.1 General
6.4.2 Status of data sources
6.4.3 Appropriateness of the indicator
6.4.4 Length of period
7 Decomposition analysis of energy consumption variation
7.1 Objective and overview of calculation
7.2 General calculation
7.2.1 General
7.2.2 Definition of explanatory factors
7.2.3 Calculation of the activity factor
7.2.4 Calculation of the energy savings factor
7.2.5 Calculation of structure effects
7.2.6 Calculation of other factors
7.3 Other issues related to the decomposition of the energy consumption variation
7.3.1 General
7.3.2 Calculation over a period
7.3.3 Indicators resulting in negative energy efficiency improvement
Annex A (informative) Calculation of structure effects
Annex B (informative) Examples of energy efficiency indicators
Annex C (informative) Examples of explanatory factors
Annex D (informative) Climatic corrections of energy consumption
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Factors to be calculated
4.1 General
4.1.1 Overview of methods included in the document
4.1.2 Objectives of calculations
4.1.3 Types of explanatory factors to be calculated
4.2 Indicators, methods and applications
4.2.1 Indicators
4.2.2 Types of data used
4.2.3 Structure effects
4.2.4 Indicator choice for energy efficiency and energy savings calculation
4.2.5 Climatic corrections of energy consumption
5 Evaluation of structure effects in the variation of energy intensity
5.1 General
5.2 Calculation methods
5.2.1 Introduction to the calculation of structure effect
5.2.2 Decomposition of the energy intensity variation with the Divisia method
5.3 Calculation issues related to structure effects
5.3.1 General
5.3.2 Options of calculation of the Divisia decomposition
5.3.3 Disaggregation level
5.3.4 Chained or unchained calculation
6 Calculation of energy efficiency indices
6.1 Objective and overview of calculation
6.2 General calculation
6.2.1 General
6.2.2 Step 1: Selection of subsectors or energy uses
6.2.3 Step 2: Choice of indicators
6.2.4 Step 3: Calculation of indicator values
6.2.5 Step 4: Calculation of indicator trends as index
6.2.6 Step 5: Calculation of weighting factors
6.2.7 Step 6: Calculation of energy efficiency indices by sector
6.2.8 Step 7: Calculation of an overall energy efficiency index
6.3 Computational issues in the calculation of the energy efficiency indices
6.3.1 General
6.3.2 Options for calculation
6.3.3 Indicators resulting in negative energy efficiency improvement
6.4 Reliability of energy efficiency indices
6.4.1 General
6.4.2 Status of data sources
6.4.3 Appropriateness of the indicator
6.4.4 Length of period
7 Decomposition analysis of energy consumption variation
7.1 Objective and overview of calculation
7.2 General calculation
7.2.1 General
7.2.2 Definition of explanatory factors
7.2.3 Calculation of the activity factor
7.2.4 Calculation of the energy savings factor
7.2.5 Calculation of structure effects
7.2.6 Calculation of other factors
7.3 Other issues related to the decomposition of the energy consumption variation
7.3.1 General
7.3.2 Calculation over a period
7.3.3 Indicators resulting in negative energy efficiency improvement
Annex A (informative) Calculation of structure effects
Annex B (informative) Examples of energy efficiency indicators
Annex C (informative) Examples of explanatory factors
Annex D (informative) Climatic corrections of energy consumption
Bibliography