This podcast focuses on buildings as dynamic network participants in the orchestra of cross-sectoral use cases at the interface between energy and the smart home environment. We explore how an interoperable data ecosystem opens up new avenues for energy efficiency, transparency, and municipal planning. The focus is on data-driven use cases that demonstrate how data spaces enable the secure and standardized exchange of energy-related information as a foundation for agent-based AI. We also discuss the energy efficiency data portal as a central platform for municipal heat planning and the fulfillment of public sector transparency obligations under the Energy Efficiency Act. Visionary minds from various "X-projects" (including SmartLivingNEXT and Energy Data-X) provide insights into how interoperable data spaces foster innovation, support legal requirements, and pave the way for a sustainable, AI-supported future of living. A podcast for everyone who understands data as the key to the energy transition.