In the past years, standardization in IoT has largely focused at the technical communication level, leading to a large number of different solutions based on various standards and protocols, with limited attention to the common semantics contained in the message data structures exchanged at the technical level. As a result, there is widespread fragmentation in current market and technology, characterized by non-interoperable concepts. The Smart Appliances REFerence ontology (SAREF) is a shared model of consensus developed in close interaction with the industry and with the support of the European Commission. It is published as a technical specification by ETSI (TS 103 264 - V1.1.1) and provides an important contribution to achieve semantic interoperability for smart appliances. This presentation builds on the success achieved in standardizing SAREF and presents SAREF4EE, an extension of SAREF to fully support demand/response use cases in the Energy domain, created in collaboration with the EEBus and Energy@Home industry associations to interconnect their (different) data models. By using SAREF4EE, smart appliances from manufacturers that use the Energy@Home or EEBus standards can easily communicate with each other and associate into single device-application-platform ecosystems. Further extensions of SAREF will be created to support use cases in different domains.