The SERC Engineering Committee (EC) Intra-Regional Long-Term Working Group (LTWG) coordinates, updates and prepares the most up-to-date models of the SERC Region and conducts long term intra-regional reliability assessment studies to assist SERC in performing its delegated functions. SERC stakeholders, primarily Transmission Planners and Planning Coordinators, rely on the deliverables from the Long-Term Working Group for deriving starting models for their in house planning studies in order to comply with respective NERC standards, coordinating with neighbors in updating study models and performing long term planning assessments with more up to date data that is only available through the SERC Long-Term Working Group coordination.