The TROLIE Working Group was started to address the interoperability challenges brought on by FERC Order 881. The TROLIE 1.0 project scope addresses the key use cases for the exchange of transmission ratings and limits necessary to ensure compliance and reliable operations. In this webinar, the TROLIE maintainers will explore these use cases and highlight how the TROLIE OpenAPI specification addresses them. Attendees will gain insights into the concepts that the TROLIE project identified when articulating solutions to the 881 use cases, as well as how to make effective use of the project documentation and the specification itself. The presentation will focus on ensuring the audience is prepared to implement their respective interoperability use cases. Accordingly, this will be a fast-paced, in-depth tour of all that the project has produced as it nears completion.