Energy Management has been around for many years, at least realized with KNX. The presentation will provide technical details on how energy management is typically realized today with KNX Classic, after which the speaker will give an insight into the objectives of the EN 50491-12-2 standard, which hopes to standardize energy flexibilities between a central customer energy manager and devices or systems in a home or building. While explaining the EN50491-12-2, it will be clarified how these concepts could be realized with traditional KNX system features, with forthcoming KNX IoT features and how the current and future KNX devices will then interact.