As Great Britain’s power system progresses towards net zero, the growing use of inverter-based resources (IBRs) brings complex dynamics that traditional models can’t adequately capture. Detailed Electromagnetic Transient (EMT) models are crucial for understanding fast control interactions, fault responses, and low-inertia system behaviour, which are vital for planning and system security. To ensure secure and stable operations with more IBRs in the future, the National Energy System Operator (NESO) has tasked the National HVDC Centre with developing a high-quality EMT model for the Western HVDC link. This model aims to capture its fast switching and flexible operation, vitally contributing to system stability. This initiative involves input from Transmission Owners and is part of NESO’s efforts to establish a robust EMT simulation environment, essential for future grid studies and readiness.