IEC TR 62746-2:2025

IEC TR 62746-2 ®
Edition 2.0 2025-11
TECHNICAL
REPORT
Systems interface between customer energy management system and the power
management system -
Part 2: Use cases
ICS 33.200  ISBN 978-2-8327-0814-9

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CONTENTS
FOREWORD. 5
INTRODUCTION . 7
1 Scope . 10
2 Normative references . 11
3 Terms, definitions and abbreviated terms . 11
3.1 Terms and definitions . 11
3.2 Abbreviated terms . 17
4 Guidelines . 18
4.1 Common architecture model – Architectural criteria . 18
4.2 SG CP (Smart Grid Connection Point) . 23
4.2.1 Overview . 23
4.2.2 Definition of SG CP (Smart Grid Connection Point) . 24
4.2.3 Purpose of definition of SG CP (Smart Grid Connection Point) . 24
4.2.4 Target of demand / supply of power and information that is sent and
received . 25
4.2.5 Functional criteria of SG CP (Smart Grid Connection Point) . 25
4.3 The Communication of the Smart Grid and the Smart Grid Connection Point
(interface into the premises) . 26
4.4 Common messages – information to be exchanged . 27
4.4.1 General . 27
4.4.2 Intention of user stories and use cases . 27
4.4.3 Relationship of user stories and use cases . 29
4.4.4 Criteria for information exchange . 29
4.4.5 Energy management concepts . 32
4.4.6 Function-specific profiles . 34
4.4.7 Comfort, management and status information . 40
4.4.8 Upcoming profiles for new service criteria . 40
Annex A (informative) User stories and use cases collection . 41
A.1 User stories . 41
A.1.1 General . 41
A.1.2 JWG1 Flex start washing machine . 41
A.1.3 JWG2 Flex start EV charging . 42
A.1.4 JWG3 Severe grid stability issues . 43
A.1.5 JWG4 Power limitation PV . 43
A.1.6 JWG5 CEM manages devices. 44
A.1.7 JWG6 Customer sells flexibility . 44
A.1.8 JWG7 Customer sells decentralized energy . 45
A.1.9 JWG8 Grid-related emergency situations . 45
A.1.10 JWG9 Customer connects new smart device . 46
A.1.11 JWG10 Energy consumption information . 46
A.1.12 JWG11 Unexpected disconnect . 46
A.1.13 JWG12 Expected Yearly Costs of Smart Device . 46
A.1.14 JWG13 Energy storage and feed in based on tariff. 47
A.1.15 JWG14 Energy Consumption Management From External . 47
A.1.16 JWG15 Manage in-premises battery system . 48
A.1.17 JWG16 Manage DER . 48
A.1.18 JWG17 Peak shift contribution by battery aggregation . 49
A.1.19 JWG18 Control appliances based on price information . 49
A.1.20 JWG19 Control appliances based on energy savings signal . 50
A.1.21 JWG20 Control appliances before power cut . 50
A.1.22 JWG21 Control appliances in case of natural disaster . 51
A.1.23 JWG22 Bilateral DR-negawatt . 51
A.1.24 JWG23 User story lighting . 52
A.1.25 JWG24 Energy market flexibility management . 53
A.1.26 Japanese building scenarios on energy management . 54
A.2 User stories and use case mapping table . 57
A.3 Use case descriptions . 66
A.3.1 Overview . 66
A.3.2 High level use case (JWG1100) Flexible start of a smart device (SD) . 66
A.3.3 Specialized use case (JWG1110) Control of Smart home appliances
based on price information by time slot . 76
A.3.4 High level use case (JWG112x) Manage mixed energy system like heat
pumps with PV, storage battery . 82
A.3.5 High level use case (JWG113x) Log mixed energy system events of
heat pumps with pv, storage battery . 89
A.3.6 High level use case (JWG120x) Provide local power managing
capabilities . 96
A.3.7 High level use case (JWG121x) Provide local power managing
capabilities . 102
A.3.8 High level use case (JWG2002) District Energy Management . 108
A.3.9 High level use case (WGSP 211x) Exchanging information on
consumption, price device status, and warnings with external actors and
within the home . 118
A.3.10 High level use case (JWG212x, based on WGSP212x) Direct load-
generation management (international) . 137
A.3.11 high level use case (WGSP2140) Tariff synchronization . 154
A.3.12 High level use case (JWG3000) Limitation of Power Consumption . 165
A.3.13 High level use case (JWG3001) Limitation of Power Production . 175
A.3.14 High level use case (JWG3002) Monitoring of Grid Connection Points . 186
A.3.15 High level use case (JWG3003) Monitoring of power consumption . 192
A.3.16 high level use case (JWG3004) Time of Use Tariff . 197
A.3.17 high level use case (JWG3005) Power Demand Forecast . 204
A.3.18 high level use case (JWG3006) Power Envelop . 209
A.3.19 high level use case (JWG4000) Residential Home Energy Management
integrating DER flexibility aggregation . 224
Bibliography . 229

Figure 1 – Examples of demand response capabilities . 9
Figure 2 – Smart environment as of today . 10
Figure 3 – Criteria for interoperability . 10
Figure 4 – External actor definition . 13
Figure 5 – Internal actor definition . 14
Figure 6 – Smart Grid Functional Architecture Model . 18
Figure 7 – Neutral interfaces . 20
Figure 8 – Mapping Interface (I/F) structure . 20
Figure 9 – Example of a mapping of messages . 21
Figure 10 – Different CEM configurations see SG-CG/M490 [5] to [9] . 21
Figure 11 – Physical combinations . 22
Figure 12 – Examples of CEM architecture . 23
Figure 13 – "Group of domains” and "Functional Architecture Model” . 24
Figure 14 – Smart Grid Connection Point SG CP . 26
Figure 15 – SG CP (in the case of interruption of electrical power supply from energy
supplier) . 26
Figure 16 – User stories and use cases process . 28
Figure 17 – Relationship user stories and use cases . 29
Figure 18 – Examples of information to be exchanged . 30
Figure 19 – Traffic Light Concept . 33
Figure 20 – Structure of a power profile . 35
Figure 21 – Consumption and generation . 35
Figure 22 – Structure of an easy power profile . 36
Figure 23 – Structure of a price profile . 37
Figure 24 – Structure of a load / generation management profile . 38
Figure 25 – Structure of a temperature profile.
...