On 20 March 2025, AusNet Services submitted an application to the AER under clause 6A.7.3(a1)(1) of the National Electricity Rules (NER), seeking a determination on its phasor measurement unit (PMU) cost pass through application. The application relates to a notice issued by the Australian Energy Market Operator (AEMO) under clause 4.11.1(d) of the NER requiring replacement of the Victorian High Speed Monitoring network with PMUs.