The National Institute of Standards and Technology (NIST) seeks comments on draft NISTIR 7628, Smart Grid Cyber Security Strategy and Requirements. This initial draft of the document contains the overall security strategy for the Smart Grid. Contents include: Development of vulnerability classes, identification of well-understood security problems that need to be addressed, selection and development of security-relevant use cases, initial privacy impact assessment, identification and analysis of interfaces identified in six functional priority areas, advanced metering infrastructure (AMI) security requirements, and selection of a suite of security documents that will be used as the base for determining and tailoring security requirements. This is the first draft of NISTIR 7628; NIST plans to post a subsequent draft of this report for additional public comments.