Balancing services · Historical case study
What is a battery actually paid for? An Australian revenue example
Published:
Case period: 2019-12-14–2020-06-14
The familiar battery business story is simple: charge when electricity is cheaper and discharge when it is more expensive. That explanation does not reveal the full service picture. A useful next step is to open an operating project’s report and read its revenue lines separately, rather than combine them into a single figure labelled profit.
What the report actually measures
For 14 December 2019–14 June 2020, ESCRI’s technical report records approximately AUD 15.6 million in FCAS revenue, AUD 102,000 in discharge revenue and AUD 76,000 in charging costs. FCAS means Frequency Control Ancillary Services. These are Australian dollars for one historical project and reporting period.
ARENA’s 2021 review places the result in a wider account of the project. Here, we also use the original operating report’s categories and exact reporting dates. This matters because even an accurate figure can become misleading if its label or period changes when the story is retold.
Energy revenue and service revenue
The discharge revenue line records revenue received for energy delivered. It does not, by itself, include every expense and is not a net profit measure. Subtracting the stated charging cost would still leave the question of which other project costs should be included. We therefore do not present the difference between those two lines as an investment return.
The FCAS line directs attention to a different question: which system service does the asset provide? It is useful to distinguish the quantity of electricity from the ability to respond. The financial categories show how different operating objectives can sit alongside one another, even when the same physical equipment serves them.
Why this particular period stood out
The operating report links unusually high FCAS revenue to South Australia’s separation from Victoria on 31 January 2020 and the subsequent need for local services. It also explains that energy arbitrage took a lower priority than maintaining availability for contingency frequency response.
That context helps us read the result as a combination of market conditions and operating choices. Taking an exceptional half-year and multiplying it by two would not produce a reliable forecast for the following year. Nor is dividing revenue by installed power enough to compare two projects meaningfully: their services and operating circumstances must be compared first.
A better question for a prospective owner
The value of this case is not a promise to reproduce an Australian result in Lithuania. It offers a clearer conversation about a business model. Who buys the service? What action must be delivered? How is that action verified? Which costs have already been included in the figure being presented? Those answers explain an offer more effectively than a payback period alone.
Our separate ESCRI article examines the battery’s technical response during disturbances. The useful takeaway here is a map of revenue: different lines represent different activities, and total revenue is not yet the owner’s final outcome. We do not translate this project’s AUD figures into revenue, pricing or a payback estimate for a Silver BESS battery.