Ancillary Services vs. Energy Revenue for Batteries: Strategies to Monetize Effectively

Battery energy storage systems (BESS) are now an essential part of the modern power system, offering flexibility and reliability. They can participate in both ancillary services and energy markets and earn multiple revenue streams. However, deciding when to put a battery asset into ancillary services vs energy trading can be challenging as each market has its own benefits and limitations. For battery asset owners and investors, a balanced approach to participating in both markets can be the key to getting the most out of your asset. This article explores the challenges of optimizing battery commitment between ancillary and energy markets and how SYSO can help you maximize returns.

Battery assets deliver value across different market segments, but deciding the right split between ancillary services and energy trading requires a deep understanding of market dynamics, system demand, and operational strategy.

Energy Market Participation: In energy markets, batteries participate through energy arbitrage, charging when prices are low and discharging when prices are high. These markets include day-ahead and real-time structures where prices fluctuate based on supply and demand. Energy arbitrage can be very profitable, especially during peak demand or unexpected market volatility. However, timing is everything, and poorly timed dispatches can mean missed revenue or suboptimal returns.

In the energy markets, batteries also support renewable integration by storing excess solar or wind during off-peak hours and discharging during peak demand. This solar+storage setup is critical for balancing intermittent renewable energy output and providing system stability. However, energy market participation is limited by battery capacity, discharge duration, and degradation, which can shorten the battery’s life if not managed correctly.

Ancillary Services Market Participation: The ancillary services market pays battery assets for services that support power system reliability. Services like frequency regulation, spinning reserves, and non-spinning reserves are essential for grid balance as renewables grow. Batteries are ideal for ancillary services because of their fast response time, which allows them to adjust output based on demand.

Frequency regulation, for example, requires batteries to increase or decrease output in seconds to maintain grid frequency. Batteries can also participate in spinning reserves, sitting on standby to provide power in an emergency. Ancillary services can provide steady revenue for batteries. Still, there is often a trade-off with energy arbitrage, as participation in ancillary services means that battery capacity is committed and cannot participate in other markets. The exception to this rule would be real-time energy markets or ECRS markets in ERCOT, where batteries can be dispatched quickly to meet peak demand if their capacity is not being utilized in the ancillary markets. Balancing the operation of your asset becomes challenging, as you have several options to deploy.

Balancing State-of-Charge and Lifecycle Management: A key consideration in battery market participation is state-of-charge management which balances revenue opportunities with operational constraints. Batteries need to maintain a certain state of charge to respond to ancillary service demands and manage discharge cycles for energy trading. Getting this balance right is critical to optimize revenue and protect the asset’s life, as excessive cycling and deep discharging can shorten the life of the asset.

Operating in both markets without a commitment plan can mean suboptimal dispatches and missed revenue. A data-driven approach that monitors market signals, battery health, and state-of-charge is required to decide when to allocate battery capacity to each market.

SYSO’s experience in operating and optimizing battery assets allows clients to navigate the energy and ancillary services markets with ease. With a sophisticated data-driven approach, SYSO helps battery owners optimize commitments, maximize returns, and extend asset life. Here’s how SYSO can help clients get the most out of their battery assets:

Real-Time Market Monitoring and Optimization: SYSO’s 24/7 Network Operations Centre (NOC) monitors the market in real-time, tracking energy prices, ancillary service demands, and system conditions. By monitoring market fluctuations, the NOC can make real-time adjustments to ensure battery assets are committed optimally to capture revenue during peak demand periods. This responsiveness to market conditions is critical to maximize returns in the volatile energy market and keep availability for ancillary services.

Data Analytics and Forecasting: SYSO’s data scientists use advanced data analytics to forecast energy prices, power demand, and ancillary service requirements. These forecasts enable SYSO to make data-driven decisions, such as when to discharge stored energy for maximum revenue or reserve capacity for frequency regulation. By using historical data and predictive models, SYSO can anticipate market changes and ensure battery assets are positioned strategically to take advantage of both energy and ancillary service opportunities.

Customized State-of-Charge Management: State-of-charge management is critical to achieving a balanced strategy between energy and ancillary services. SYSO customizes state-of-charge strategies for each asset based on its market objectives, discharge duration, and capacity. This ensures batteries have a sufficient state-of-charge to meet ancillary service requirements without sacrificing energy market revenue opportunities. By maintaining optimal state-of-charge, SYSO extends the life of the battery and supports consistent revenue.

Regulatory Compliance and Market Access: Each market has its own regulations and performance requirements, and SYSO ensures that client assets remain compliant and maximize market access. SYSO manages all registrations, performance audits, and compliance requirements, reducing operational risk and enhancing the asset’s reputation in the market. This allows battery owners to focus on growth while SYSO handles the complexity of regulatory compliance and market qualification.

Resource Allocation for Revenue Stacking: SYSO’s expertise in revenue stacking, earning revenue from multiple streams at once, allows clients to get the most out of their battery assets. SYSO monitors market conditions to determine the best allocation of battery capacity across ancillary, capacity, and energy markets. This balanced approach captures the best of both revenue opportunities without compromising the battery’s operation.

Long-Term Asset Management: SYSO takes a long-term approach to battery asset management to ensure operational strategies protect and extend the asset’s life. By monitoring output, tracking performance, and predictive maintenance, SYSO helps clients minimize degradation and maintain asset health. This focus on life cycle management allows SYSO clients to capture consistent returns over the life of the battery and maximize their return on investment.

Request a Battery Asset Audit

For battery asset owners and investors, participating in both ancillary services and energy markets requires a data-driven strategy. Balancing commitments between the two markets allows batteries to earn revenue through energy arbitrage and support grid stability through frequency regulation, spinning reserves, and other ancillary services. This balance is complex and requires expert oversight to optimize.

SYSO’s market expertise, advanced data analytics, and 24/7 monitoring ensure battery assets are managed for maximum profit. With SYSO, you can confidently navigate the energy and ancillary services markets, get sustainable returns, and maintain asset health. Contact us today for a battery asset audit, where our team will analyze your operating strategy against our historical performance to identify weaknesses and vulnerabilities.