Geographic information science encompasses several technologies that enable the examination and analysis of phenomena over both time and space. This presentation will focus on the use of one of these technologies, Geographic Information Systems (GIS). At the National Renewable Energy Laboratory, GIS is used to support analysis activities targeting renewable energy resource characterization and technology development. GIS also offers unique capabilities to respond more thoroughly to analytical questions by evaluating multiple layers of geographic and time-dependent information simultaneously. The seminar will encompass several applications at NREL where GIS has been used to supplement analysis and provide information to a cross-section of stakeholders. The presentation also will discuss areas where GIS can be used to more effectively explore questions that are important to the United States' energy future and security. Liz Brady Sabeff is a Scientist II specializing in Geographic Information Systems within the Distributed Energy Resources Center at NREL. She has been with NREL since 1993, providing Laboratory-wide consultation and support in GIS.