- ACCURE has released its 2025 Energy Storage System Health & Performance Report – the first comprehensive analysis of operating data from more than 100 grid-scale battery energy storage systems (BESS) spanning 18+ GWh of capacity worldwide.
- The report offers the most comprehensive view yet into how these critical grid assets perform in the real world, from best to worst.
With battery energy storage rapidly becoming a cornerstone of the global energy transition, ACCURE’s report finds that this power market sector still faces significant operational and financial risks. Drawing on the world’s largest independent battery monitoring database, the report recognizes common challenges, identifies high-performance benchmarks achieved by projects that use best practices and advanced technology, and shows where other BESS assets fall short, impacting safety, performance, reliability and financial returns.
The report highlights that while most systems perform reliably, significant operational issues impacting revenue, with 19% of components showing revenue-reducing issues, and common State of Charge (SoC) errors in lithium iron phosphate battery (LFP) systems. Key findings also include high rates of commissioning delays (46% longer than 3 months) and typical oversizing of 15-25% in projects.
Key Findings from the Report
- Component Issues: 19% of components in BESS projects exhibit issues that directly reduce revenue.
- Commissioning Delays: A significant portion of projects, 46%, face commissioning delays of three months or more.
- State of Charge (SoC) Accuracy: Lithium Iron Phosphate (LFP) systems commonly experience SoC errors of ±15%, while other types have 5-10% errors, which requires larger safety margins.
- Oversizing: Most suppliers build a significant oversizing margin into their projects, typically between 15% and 25%.
- Efficiency: Top-performing systems achieve a round-trip efficiency (RTE) of 88% or higher, while many others operate above 85%.
“Investors and operators deserve better than guesswork. Independent analytics turn hidden faults into actionable insights — protecting revenues and building long-term confidence in storage,” said Dr. Kai-Philipp Kairies, ACCURE CEO and Co-founder. “This report arms asset owners, operators, and investors with the insights they need to adopt best practices and technology, identify risks early, optimize operations, and hold vendors accountable.”
The report’s findings make clear that while most BESS projects perform reliably, the industry has significant room for improvement. Independent, data-driven monitoring emerges as a crucial tool for mitigating risks, protecting revenues, and building investor confidence in long-term BESS performance.
Link to the full report HERE
Author: Bryan Groenendaal
