New FCAS Resources Dominate Enabled Levels in 2025

Why It Matters

The shift reshapes revenue streams for generators, accelerates investment in battery storage, and alters grid reliability dynamics across the National Electricity Market.

Key Takeaways

• Batteries now supply majority of FCAS capacity
• Ancillary service units hold significant raise market share
• Large solar presence remains marginal across FCAS services
• Traditional generators' FCAS participation continues to decline
• Inverter‑based resources reshape ancillary market dynamics

Pulse Analysis

The Australian National Electricity Market (NEM) has long relied on conventional generators to provide Frequency Control Ancillary Services (FCAS). However, the latest Generator Statistical Digest 2025 reveals a decisive pivot: inverter‑based resources, primarily grid‑scale batteries, now dominate enablement across all FCAS products. This transition reflects the accelerated deployment of battery storage over the past decade, driven by falling technology costs, policy incentives, and the need for rapid response capabilities that batteries uniquely offer.

For market participants, the dominance of batteries and ancillary‑service units reshapes revenue models and competitive dynamics. Traditional coal and gas plants see their FCAS income erode as they are out‑bid by faster, more cost‑effective storage assets. Simultaneously, the rise of "Electricity" classified ancillary units—often aggregations of smaller batteries or virtual power plants—introduces new pricing patterns, especially in raise regulation markets where they now hold a substantial share. Grid operators must adapt to increased variability in bid behavior, while investors are incentivized to prioritize flexible, inverter‑based technologies.

Looking ahead, the continued growth of battery storage is likely to deepen its market share, potentially offsetting the modest contributions from large solar and other renewables. Policy frameworks that reward fast‑acting resources and streamline VPP participation will further entrench this trend. Stakeholders should monitor emerging technologies such as hybrid battery‑solar sites and advanced control algorithms, as they could expand the definition of "new" FCAS resources and drive the next wave of ancillary service innovation.