Solar + Storage: How to Increase Returns on Your Solar Development with Battery Integration

For solar developers, adding battery storage to a solar project can help increase project revenue and maximize returns. Storage with solar means more control over energy output, more flexibility in managing power system demand, and more revenue opportunities for solar asset owners. This article looks at how battery storage can boost solar project profitability, outlines missed revenue opportunities by not coupling storage, and how SYSO can help developers get the most out of their solar+storage projects.

Battery storage brings many benefits to solar projects, allowing developers to generate more power, navigate grid constraints, and earn revenue in ways that can’t be done with solar alone. Let’s explore some of the key benefits of coupling solar with storage:

Solar Clipping Capture: Solar projects often produce more power than the electric system can handle during peak hours. During this period, “solar clipping” occurs where excess energy is curtailed to avoid overloading the system or due to inverter capacity limitations. By pairing a battery with the solar installation, the excess energy can be stored and released when it’s most valuable. Solar clipping improves the efficiency of solar generation and adds a new revenue stream by allowing stored energy to be dispatched during higher-priced market periods.

Energy and Ancillary Markets: A battery with a solar project has the flexibility to operate on a standalone basis. This allows the battery to earn extra revenue beyond solar generation. Batteries can participate in energy markets, discharging stored energy during peak demand periods to capture higher prices. They can also participate in ancillary service markets, like frequency regulation and spinning reserves, that pay resources for stabilizing the electric system. These additional revenue streams mean a solar+storage system can earn revenue all day, not just during solar hours.

Managing System Operator Curtailment Orders: During grid congestion, system operators may issue curtailment orders to solar projects to reduce or stop energy output to prevent system overload. Without storage, the solar system earns zero revenue during these period. However, with a battery, the solar project can store the energy that would otherwise be curtailed and release it when the curtailment period ends. This allows the system to maximize uptime and minimize lost revenue.

System Reliability and Peak Load Reduction: Solar+storage benefits the project owner and adds value to the broader grid by keeping it stable during peak periods. By releasing stored energy during high demand, solar+storage reduces stress on the grid, reduces peak load dependency, and supports overall power system reliability. This reliability benefit also makes the case for potential incentives from utilities or regulators, another layer of value for developers.

There are several additional revenue opportunities available to solar asset owners that install storage. These same opportunities are often missed when solar is not coupled with the project.

Solar Clipping Waste: When a solar project is forced to curtail due to over-generation, the valuable energy that could have been stored and sold later is wasted. That energy could have been captured with battery storage and turned into revenue.

Limited Market Participation: Without a battery, solar projects are “non-dispatchable” resources, meaning they can’t provide the critical ancillary services that require quick response. That means they can’t earn extra revenue from the energy and ancillary services markets where batteries are well suited to participate due to their fast ramping capabilities.

Curtailment Mitigation: Solar-only projects have limited options when curtailment orders are issued, and during those periods, they have to shut down completely, resulting in lost revenue. With storage, a project can store the curtailed energy and protect its revenue by dispatching stored energy when the curtailment is lifted.

Lower ROI: A solar project without storage only sells energy, so its revenue is highly variable and dependent on weather and time of day pricing. Storage provides a buffer against that variability by allowing the system to store energy during low-demand periods and dispatch it when prices are high, thus stabilizing and increasing project returns.

While adding storage brings many benefits, it also brings operational complexities and challenges:

System Planning and Optimization: Integrating storage with solar requires careful planning to size the battery correctly and optimize the combined system’s operating strategy. Poor planning can lead to underutilized assets, suboptimal returns, and missed revenue.

Navigating Regulations: Operating a solar+storage system requires a deep understanding of the regulatory landscape and market rules. Regulations vary by region, and misalignment with local requirements can result in fines, penalties, or restricted market access.

Real-Time Operations Complexity: Managing a solar+storage asset requires real-time monitoring and fast decision making to navigate fluctuating market prices, state of charge limits, and system demands. Without the right expertise, this complexity can lead to inefficient operation, reduced battery life, or missed opportunities in energy and ancillary markets.

State-of-Charge vs Revenue Maximization: To get the best revenue outcomes, you need to manage state-of-charge to ensure the battery is available to discharge during high-priced intervals without depleting capacity too early. Balancing revenue and battery health is key to maximizing long-term returns and asset life.

SYSO provides end-to-end support to solar developers looking to add storage, from system planning to operations to revenue optimization. With SYSO’s expertise, developers can overcome the solar+storage challenges and capture all the revenue opportunities.

System Planning, Design, and Commissioning: SYSO’s team will help developers plan and design their solar+storage system to perform optimally. This includes sizing the battery, aligning the operating strategy with revenue goals, and designing the system for maximum flexibility and efficiency.

SYSO’s expertise starts with commissioning support providing revenue forecasting to match project expectations with market reality. During cold commissioning, SYSO ensures all systems are tested and meet technical specifications. Hot commissioning involves activating the system and verifying each component works as expected in real-world conditions. This leads to market commissioning, where SYSO ensures the asset is registered and ready to participate in day-ahead and real-time markets. 

Market Access and Compliance: SYSO’s regulatory expertise ensures each project meets grid requirements and is registered for market participation. SYSO will assist with asset registration, market qualification, and ongoing regulatory compliance so the project is ready for energy and ancillary service markets.

Real-Time Asset Operation and State-of-Charge Management: SYSO’s 24/7 Network Operations Center (NOC) monitors real-time market signals and manages battery asset state-of-charge to capture high-value intervals. The NOC’s data-driven approach ensures that assets are optimally dispatched in response to market fluctuations to maximize revenue while maintaining battery health.

Data-Driven Revenue Optimization: SYSO uses advanced analytics and predictive modeling to optimize revenue. By looking at market trends, power system conditions, and historical performance data, SYSO will tailor the operational strategy to each solar+storage project to maximize immediate returns and long-term asset value.

Full System Management: SYSO will manage solar+storage projects from asset registration to daily operations and long-term strategy. This full-service approach allows developers to focus on growth while SYSO handles the complexity of market participation and asset optimization.

Ready To Learn More?

Solar+storage is a winning strategy for higher returns, reduced curtailment risk, and increased flexibility in the power market. By capturing solar clipping, participating in ancillary markets, and optimizing dispatch for peak demand, a solar+storage system can generate significant revenue. SYSO’s expertise in system planning, regulatory compliance, and real-time operations makes us the perfect partner for developers looking to get the most out of their solar assets. Contact us today to find out how we can help.