The Smart Grid is being constructed of out systems old and new, from creaking mainframes, to shiny new ones that live in the clouds, and everything in between. Utilities professionals, and those who serve them, need to ensure that they are secure so that we can build out and operate the future grid with confidence. This short presentation, the 3rd in a 10 part series on Smart Grid security, offers an easy to digest, business-level introduction to the topic.