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This document has been published by the TSO to provide clarity on the electromagnetic transient (EMT) modelling requirements for Battery Energy Storage System (BESS) Power Park Modules (PPM) in Ireland, as specified in Grid Code clause PC.A8 (Modelling Requirements for Users) [1.], in compliance with European legislation EU 2016/631 reflected in the Network Code for grid connection of generators (Requirements for Generators (RfG) [2.]). The contents of this document are also in alignment with the recommended amendments to the existing Network Codes submitted by ACER to the European Commission in December 2023 (RfG 2.0) [3.], and expected to be approved in 2025.