SA1· NEM — 5-min dispatch intervals
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South Australia is at the forefront of FCAS market evolution in the NEM. With the highest renewable penetration of any mainland region, SA frequently operates with minimal synchronous generation, creating sustained demand for fast frequency response and regulation services.
The Hornsdale Power Reserve and other battery installations in SA are dominant FCAS providers, regularly setting marginal prices for regulation and 6-second contingency services. When the Heywood interconnector to Victoria is constrained, SA can become an isolated FCAS island with significantly elevated prices.
SA's FCAS markets provide valuable insights into how ancillary service pricing behaves under high-renewable, low-inertia conditions — a situation that other NEM regions are expected to face increasingly as the energy transition progresses.