Version 1.0 (V1.0) of NIST Interagency Report (NISTIR) 7628, Guidelines for Smart Grid Cyber Security, is the Smart Grid Interoperability Panel-Cyber Security Working Group's (SGIP-CSWG's) report for individuals and organizations who will be addressing cyber security for Smart Grid systems. This includes, for example, vendors, manufacturers, utilities, system operators, researchers, and network specialists; and individuals and organizations representing the IT, telecommunications, and electric sectors. This report assumes readers have a functional knowledge of the electric sector and a functional understanding of cyber security.