Gore Street Capital: Turning SOC accuracy into 5%+ more trading revenue

Gore Street Capital (GSC) is one of the leading energy storage fund managers in the world, operating a portfolio of over 1 GW across five markets: Great Britain, Ireland, Germany, ERCOT (Texas, USA) and CAISO (California, USA). At that scale, even incremental improvements in how assets trade have material consequences for the fund.

When SOC inaccuracy limits tradable energy

SOC inaccuracy is not unusual in battery energy storage systems. Over time, small deviations build between reported and actual deliverable energy. When battery management systems underestimate available capacity, assets appear capable of delivering less than they can discharge. And although the system can be recalibrated, this often occurs after favorable market conditions have already passed. The problem is particularly acute in Lithium Iron Phosphate (LFP) systems, the most widely deployed cell chemistry in grid-scale storage, where the characteristically flat voltage curve makes it inherently difficult for the BMS to accurately estimate SOC.

In ERCOT, where the Security-Constrained Economic Dispatch (SCED) recalculates every five minutes and real-time prices can spike thousands of dollars per MWh, the stakes around dispatch accuracy are uniquely high. The High Sustainable Load (HSL) parameter tells the market how much a battery can deliver in each interval. When SOC inaccuracy corrupts that figure, the cost compounds across every dispatch window. Industry modeling indicates that BESS assets can miss more than $1,000,000 per GWh annually due to SOC misalignment.

The hidden cost of SOC misalignment

To understand what this meant in practice, ACCURE and Gore Street Capital analyzed full operating data from June 2025 through August 2025 at the 75 MW Dogfish site, a 1-hour BESS operating in ERCOT.

The analysis surfaced an example that illustrates the issue perfectly. During a 02:00 a.m. price peak, when the BESS index reached $267/MWh, 3.8 MWh of tradable energy was left idle because the reported SOC did not reflect true battery capacity. By the time the EMS recalibrated, the price window had already closed, and the estimated revenue loss exceeded $1,000 in just that single discharge cycle.

What’s more, this was not a one-off anomaly. It reflected a structural mismatch between what the system reported was available and what the battery could realistically and reliably deliver to market.

From diagnosis to $110,000 + without a single hardware change

ACCURE can implement its SOC Correction directly through the site’s energy management system (EMS), using the existing infrastructure with no additional hardware or lab testing required. The integration approach was defined early on by Gore Street Capital, ACCURE, and the EMS supplier, with the required software updates delivered on the EMS side and corrected State of Energy (SOE) and HSL parameters provided through ACCURE’s platform.

This allowed GSC to improve confidence in available energy without adding burden on GSC’s operations and maintenance teams. While SOE and HSL are specific to ERCOT, the approach adapts to whichever parameters govern trading and reporting in each grid.

The objective was practical: give GSC a reliable view of available energy so the team could tighten trading buffers without increasing under delivery risk.

Realizing material trading revenue impact in challenging market conditions

Based on historical analysis, the estimated financial benefit at Dogfish exceeds $110,000 annually, with further optimization potential already identified. On a market-wide basis, this corresponds to roughly a 5% uplift relative to average BESS trading revenues in ERCOT.

The improvement comes from more precise dispatch, better spread capture, and more accurate accounting for tradable energy that EMS estimations would otherwise leave as buffer. At the same time, deviation risk declines, reducing the risk of non-compliance penalties and limiting revenue volatility. The result is higher top-line performance with stronger risk mitigation.

“At Gore Street Capital, we are focused on leveraging technology across the portfolios we manage - from our trading desk through to asset management - to drive stronger revenue outcomes and maintain high levels of asset uptime. Improving the quality and confidence of operational data is fundamental to that approach. Our work with ACCURE complements this strategy.”

Daniel Sherlock-Burke, Director of Asset Management, Gore Street Capital

Building on this, GSC is integrating data from ACCURE's SOC Correction into its own internal tooling to inform trading decisions across its portfolio, with plans to extend this capability to optimizers in Great Britain, including its own Gore Street Energy Trading (GSET) team.

Scaling benefits across GSC’s portfolio

Gore Street Capital operates assets across Great Britain, Ireland, Germany, and ERCOT and CAISO in the USA. As portfolios scale, small data inaccuracies scale with them. What appears marginal at a single site becomes material across hundreds of megawatts.

ACCURE’s approach is designed to work across different market structures. In markets where dispatch is managed directly by the operator, corrected energy values can be used to inform trading decisions through cloud-based integrations and support internal optimization workflows. In centrally dispatched markets such as ERCOT, where the grid operator determines dispatch, those same corrected values are delivered directly to the EMS so they can be reflected in market-facing parameters. The Dogfish case demonstrates that SOC accuracy is not simply a technical adjustment. It is a financial lever embedded in everyday operations. By integrating corrected SOC values through the EMS or via cloud-based workflows, portfolio owners can unlock additional revenue and reduce risk exposure without adding hardware complexity.

Beyond SOC Correction

‍The benefits of ACCURE's work with GSC extend beyond an uplift in trading revenue. Through continuous asset monitoring across GSC's portfolio, ACCURE identified safety-critical and underperforming components early enough that suppliers replaced them at their own cost, avoiding significant CapEx for GSC. The same granular visibility supports warranty tracking, including monitoring capacity guarantees that are critical to the Gore Street Energy Storage Fund’s debt facilities, and has also contributed to preferred insurance conditions, reflecting the lower risk profile that comes with continuous monitoring at the asset level.

As battery markets mature and competition tightens, precision in energy accounting moves from operational detail to strategic advantage.

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