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This article describes the experience and motivation that drove the specific solutions developed for LIPA's EIM and data management strategy. LIPA's EIM has at its core a common information model (CIM)-based enterprise semantic model (ESM), a customized software development life cycle (SDLC), process templates, and LIPA's IT technical architecture design. Data modeling and technical architecture are based wherever possible on open design concepts with standards-based solutions that aim to achieve near plug-and-play interoperability for future data and systems integration. The development of technology and requirements for future IT projects is supported with a process-and governance structure and includes centralized management of both the enterprise wide data model and architecture development. We discuss some of the lessons learned from this significant implementation to support energy trading along with our continued work in implementing LIPA's EIM concepts for system operation and asset maintenance.