REopt® is a publicly available web tool that helps federal agencies identify the most cost-effective on-site energy technology mix, sizing, and operations to achieve federal cost savings and resilience goals. This workshop will start with an overview of Report's capabilities and then focus on hands-on exercises for attendees--covering the basics for new users and introducing new and advanced capabilities for experienced users. Participants should expect to leave the workshop armed with knowledge, resources, and confidence to use the tool effectively on their own in service of site and agency objectives.