Energy Smart Environments: Emergence and Interoperability beyond the Constituent Smart Systems Unified as Complex Adaptive Systems of Systems

The present paper examines Energy Smart Environments (ESE) as a conceptual framework that integrates a wide variety of smart domains-also known as Smart Systems (Xs)-into a complex adaptive system of systems (CASoS). Smart systems such as smart grids, smart homes, smart cities, smart transportation, smart agriculture, and smart wearables have traditionally operated in isolated silos. However, an epistemic gap exists between these systems. ESE, conceptualized as a CASoS, is proposed as an umbrella term encompassing all Smart Xs. It constitutes a reinforced ecosystem of interconnected smart systems designed to share energy and information, enabling intelligence to flow upward from field devices to management, while command and control flow downward. The newly developed academic field titled "Energy Smart Environments" aims to translate the theoretical foundations of Smart X integration into a practical, interdisciplinary common ground. This framework positions energy as the ontological glue binding constituent systems and domains, leading to emergent characteristics such as synergistic emergence, interoperability, energyawareness, and human-cyber-physical integration. As an established academic discipline, Energy Smart Environments offers a comprehensive approach to smart energy education, integrating technical, environmental, economic, societal, and urban perspectives. A dedicated newsletter and podcast further promote public engagement with the ESE concept. Moreover, as a result of this academic initiative, the first author has been invited to teach a graduate-level course titled "Energy Management in Architecture and Urbanism", which exemplifies the integration of smart home, smart city, and smart grid domains around the energy concept. These educational efforts demonstrate how ESE functions as a systemic platform for unifying smart domains, with implications for both pedagogical advancement and the developmental evolution of sustainable energy-smart environments.