IEC 63402-2-2:2026

• Abstract:

  IEC 63402-2-2:2026 specifies the fundamental aspects of semantic interoperability for the S2 interface and the related data exchange between a CEM and the resource managers within the premises. It provides a technology independent set of data models and interaction patterns in order to enable applications for energy management within the premises. This document does not include:; – mappings to concrete data representations (XML, JSON and similar);; – mappings to application protocols for the message passing;; – security related aspects.; This group EE publication is primarily intended to be used as an EE standard for the products mentioned in the scope, but is also intended to be used by TCs in the preparation of publications for products which are included in the boundary mentioned in the scope of this document

• Status: Published
• Publication Date: 24-Aug-2026
• ICS: 03.100.70 - Management systems
• ICS: 27.015 - Energy efficiency. Energy conservation in general
• ICS: 29.020 - Electrical engineering in general
• Technical Committee: SC 23K - Electrical Energy Efficiency products
• Drafting Committee: WG 3 - TC 23/SC 23K/WG 3
• Current Stage: PPUB - Publication issued
• Start Date: 25-Aug-2026
• Completion Date: 31-Jul-2026

Overview

IEC 63402-2-2:2026 is an international standard developed by the International Electrotechnical Commission (IEC). This standard addresses energy efficiency in customer energy management systems (CEMs), focusing on the data model and messaging interface (S2 interface) between the customer energy manager and resource managers within a premises.

Its primary aim is to define the fundamentals of semantic interoperability for data exchange, facilitating communication and interaction between the CEM and various resource managers (e.g., energy producers, storage systems, appliances). The standard is technology-independent and strictly addresses data models and interaction patterns, excluding specific data representations (such as XML or JSON), application protocol mappings, and security considerations.

Key Topics

• Semantic Interoperability: Ensures consistent understanding of information exchanged between CEMs and resource managers by specifying shared data models and interaction semantics.
• Data Models and Types: Provides a comprehensive set of data types relevant for energy management-such as power forecasting, power measurement, control types, roles (producers, consumers, storage), and events (status updates, transitions).
• Interaction Patterns: Defines generic tasks and communication procedures for updating resource manager details, activating and updating control types, communicating measurements, and handling power forecasts.
• Control Mechanisms: Describes multiple control paradigms, including:
  • Power envelope-based control
  • Power profile-based control
  • Mode of operation-based control
  • Fill level/rate of charge control
  • Demand-driven control
• Communication Tasks: Outlines how CEMs and resource managers exchange and update information regarding constraints, profiles, statuses, commands, and forecasts.
• Use Cases: The annex includes high-level use cases for configuration, planning, and operational management, supporting practical energy optimization strategies within premises.

Applications

IEC 63402-2-2:2026 is widely applicable to stakeholders in the smart energy and building management ecosystem:

• Manufacturers of Energy Management Systems (EMS): Reference for designing interoperable CEMs and resource controllers, enabling seamless integration of diverse equipment (e.g., HVAC, home automation, EV chargers).
• Building Automation Integrators: Foundation for implementing semantic data exchange in commercial, residential, or industrial buildings aiming for efficient energy use.
• Grid Operators and Aggregators: Supports demand-side management, load balancing, and integration of distributed energy resources by ensuring reliable interface standards.
• Developers of Smart Appliances: Ensures their products can participate in energy management schemes for smarter, optimized operations.
• Standards Committees and Regulatory Bodies: Provides a base standard to harmonize energy-related communication across different device types and applications.

By enabling technology-agnostic interfaces, IEC 63402-2-2 supports multi-vendor environments and future-proofs energy management applications.

Related Standards

• IEC 63402 Series: The broader standard series addressing various aspects of customer energy management.
• ISO 15118: Covers vehicle-to-grid communication interface, relevant for electric vehicle integration cases mentioned in the use cases.
• IEC 61850: Focuses on communication networks and systems for power utility automation, offering complementary definitions for substation and distributed energy resource integration.
• IEC 61968/61970: Addresses application integration at electric utilities, particularly distribution management.
• IEC Common Data Dictionaries (CDD, Electropedia): For standardized terminology, critical for semantic interoperability.

Keywords

IEC 63402-2-2, energy efficiency standard, customer energy management system, CEM, resource manager interface, data model, semantic interoperability, S2 interface, energy management, smart grid, building automation, energy control, power forecasting, IEC standards, energy data exchange, smart premises.