Assessing the Financial Viability of a Utility-Scale Battery

A utility-scale storage provider sought to evaluate the economic feasibility of investing in a market-facing Battery Energy Storage System (BESS) in New South Wales (NSW). The company needed a clear understanding of the potential return on investment for a large-scale battery project over its expected lifespan. Additionally, it aimed to explore the feasibility of a 1-hour battery configuration of the same power rating (an alternative capacity option). The key question was whether such an investment would provide sufficient financial returns under various market conditions and value streams. 

Market Context for BESS in NSW

As Australia continues its transition toward renewable energy, the role of firming resources such as batteries has become increasingly vital. With traditional coal-fired power plants retiring and intermittent renewable generation rising, energy storage solutions are essential to maintaining grid stability. The NSW market offers multiple value streams for batteries, including wholesale arbitrage, frequency control ancillary services (FCAS), and network support services. However, uncertainties in revenue forecasting, capex and opex assumptions, and future market conditions made it critical for our client to conduct a thorough economic assessment before making an investment decision. 

Energeia’s Analytical Approach

Energeia was engaged to provide an independent, high-level assessment of the internal rate of return (IRR) for the proposed BESS project. Using its proprietary market modelling tool, Energeia analysed potential revenue streams, including wholesale market participation through regional reference price (RRP) arbitrage, FCAS revenue opportunities, and potential distribution and transmission network services. The study assessed revenue potential from wholesale arbitrage, FCAS participation, and network support while estimating capex and opex based on industry benchmarks. High/low sensitivity tests were conducted to account for fluctuations in energy prices and service revenues, and the financial viability of a 1-hour versus a 2-hour battery configuration was compared to determine the optimal investment pathway. 

Key Findings Financial Returns

Energeia’s analysis revealed that a 2-hour battery configuration would achieve an expected IRR of approximately a moderate return over a 20-year period under base case assumptions, while a 1-hour battery configuration would yield a slightly lower IRR of a slightly lower return. Sensitivity analysis showed that returns could vary significantly depending on market conditions, with potential for both higher profitability and financial risks. The study found that the 2-hour battery is better positioned for wholesale energy arbitrage, while the 1-hour battery benefits more from FCAS market participation. 

Energeia’s findings provided our client with a data-driven perspective on the financial viability of a utility-scale battery investment. The analysis highlighted the potential risks and rewards associated with different battery configurations and market scenarios. Following the study, the provider is considering a more detailed feasibility assessment, incorporating project-specific land and installation costs to refine financial projections. Additionally, ongoing discussions with network operators will explore potential grid services contracts that could enhance battery revenues. The company is also evaluating the inclusion of the 1-second FCAS market in its revenue modelling to maximize its return on investment. 

Energeia’s expertise in BESS financial modelling and market analysis has helped our client assess the economic feasibility of its proposed battery investment. By leveraging detailed revenue and cost assessments, scenario analysis, and industry insights, Energeia provided a comprehensive framework for making informed investment decisions in Australia’s evolving energy landscape.