The document describes the EMPOWER architecture for local energy markets. It defines the relationships between different agents in local smart grids through a mapping of technical, business, and market models. The architecture includes a control cloud, market cloud, and communication infrastructure to enable negotiation and trading of energy between consumers, producers, storage units, and the distribution system operator. It applies the SGAM model to specify the control, market and communication interactions between these entities at different zones and domains. Finally, it outlines the overall EMPOWER architecture linking field devices and flexibility services to the SESP platform and external information providers.