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The Need for a Custom Benchmark
Owning an energy storage asset means navigating a complex and volatile market where every decision counts and often, your performance is in the hands of an external trading partner. While you may trust their expertise, one question remains: how do you define what “good” really looks like?
Traditional performance measures rarely provide the answer. Generic indexes offer a rough comparison but fail to capture the reality of a specific asset. Static models assume perfect foresight and unlimited flexibility ignoring real-world constraints like ramping limits, forecast uncertainty, and market-specific rules that shape daily returns.
For asset owners, this creates a clear need for a custom benchmark: one that mirrors the behavior of their own trading desk and reflects each asset’s location, constraints, market setup, and operational strategy.
How Re-Twin Virtual Trading supports ECO STOR
To bring more clarity to how battery assets are benchmarked and evaluated, Re-Twin Energy partnered with German battery storage developer and asset owner ECO STOR who adopted the Virtual Trading module.
The module simulates how an algo-trader would perform in real markets — bid by bid — providing an independent, data-driven benchmark without taking any financial risk. Each asset receives a live custom benchmark and 7-day revenue forecast, tailored to its configuration and market setup — solving the challenge that no universal index can truly capture.
It starts with asset configuration: defining technical parameters like ramping limits, minimum durations, and market timings to reflect real operating behavior.
Next, users choose from multiple trading strategies — such as pure day-ahead, fully merchant, or custom hybrids based on their market setup. Each can be simulated and compared side by side, showing how different approaches perform under identical market conditions.
Once configured, Virtual Trading automatically generates bids using baseline forecasts for all relevant markets — including day-ahead, intraday, FCR, and aFRR.
The chart below shows how forecasted and actual day-ahead prices compare, forming the basis for these simulated bids.
The next day, the simulated bids are matched against actual market results to calculate revenues from the asset, assess forecast accuracy and benchmark asset performance.
The outcome is a complete trading trace — from forecasts to simulated clearing — showing how an asset would have performed under real market conditions.
At a glance, ECO STOR’s team can track daily results, compare strategies, and see what truly drives performance turning complex market data into clear, actionable insight.
Case Study: Establishing the Performance Floor
To show how Virtual Trading translates into actionable insights, Re-Twin simulated a 10 MW / 20 MWh BESS operating in the German market. Two strategies were tested under identical technical conditions: a baseline day-ahead approach and a fully merchant strategy designed to capture additional value from intraday and ancillary markets.
The results were clear: the fully merchant strategy (green line) consistently outperformed the day-ahead benchmark (blue line), achieving annualized revenues of €94 k and €210 k per MW respectively.
These findings define a performance floor — a realistic minimum expectation of what a well-optimized asset can achieve in real market conditions. If the actual trading results fall consistently below this floor, it triggers a non-confrontational conversation aimed at optimization, helping both the asset owner and the trader understand why the actual results deviated from the realistic potential.
By comparing simulated and actual results, operators can pinpoint why performance diverged, validate business-case assumptions, and focus on specific improvements that drive higher returns.
Beyond back testing, Virtual Trading also projects 7-day revenue forecast, allowing teams to test new strategies or tweak trading preferences in real time — turning data into a continuous learning loop for performance optimization.
The ECO STOR Edge: Driving Continuous Optimization
The simulations gave ECO STOR a clear and data-backed view of their assets' performance potential. By comparing their actual trading results against these custom virtual benchmarks, ECO STOR gains strategic insights:
- Aligning Partners: The benchmark serves as a reliable, objective reference for tracking day-to-day performance and evaluating strategic decisions.
- Identifying Constraints: ECO STOR can identify instances where operational limits (like ramping, timing, or forecast uncertainty) reduced potential revenues.
- Refining Strategy: This insight becomes the foundation for continuous optimization —fine-tuning the strategy and ensuring the asset's behavior is fully aligned with market realities.
The Roadmap for Future Success
Building on these results, ECO STOR and Re-Twin plan to expand Virtual Trading across more assets, markets, and time periods.
The next step focuses on turning virtual insights into real-world performance testing new strategies, improving forecasts, and integrating benchmark data into automated portfolio optimization.
This approach also strengthens financial reporting, providing investors with transparent, data-backed performance metrics, and supports insurance use cases where validated benchmarks help manage market risk
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