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This review paper discusses aims, architecture and security issues of smart grid, taking care of the lesson learned at University of Pisa in research projects on smart energy and grid. A key element of smart grid is the energy Home Area Network (HAN), for which an implementation is proposed, dealing with its security aspects, and showing some solutions for realizing a wireless network based on ZigBee. Possible hardware-software architectures and implementations using COTS (Commercial Off The Shelf) components are presented for key building blocks of the energy HAN such as: smart power meters and plugs, and a home smart information box providing energy management policy and supporting user's energy awareness.
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