UCA International Users Group completed its work on the second  version of the Open Home Area Network (Open HAN) System Requirement Specification (SRS) at its face to face meeting in Detroit at the end of July. The document defines the system requirements for an open standard Home Area Network system and promotes open standards to foster interoperability for home area network smart grid products. The most notable change from the first version is a new focus on security in the HAN environment.  The document provides mapping from home area network requirements to various functions and devices, including home energy management systems, load control capability and plug in hybrid vehicles. The mappings define the interfaces, and security levels for HAN communications. The document is being edited and once approved by the UCAIug board, will be released for public review.