Energy Storage Boom Outpaces Insurers as High-Capacity Batteries Reshape Risk
The energy storage industry is expanding at an unprecedented pace, leaving insurers struggling to keep up. New, high-capacity battery models—including sodium-ion alternatives—are entering the market faster than traditional risk assessments can handle. With limited actuarial data and rapidly evolving technology, underwriters now face unfamiliar challenges in evaluating risks for large-scale projects.
Since 2019, battery storage capacity per enclosure has surged by 500%, from Tesla's 3 MWh Megapack to systems like BYD's HaoHan, now reaching 14.5 MWh. This rapid scaling has outpaced insurers' ability to rely on historical models, forcing them to adapt quickly. Michael Carrington, an underwriter at Tokio Marine GX, highlighted that the renewable energy sector is innovating faster than insurers can gather reliable data.
Sodium-ion batteries have gained traction as a cost-effective alternative to lithium-ion, reducing dependence on volatile supply chains. Since 2023, commercial production has scaled up in China, with CATL launching mass production that year and HiNa Battery deploying a 50 MWh grid system in 2024. India's Faradion is also advancing, partnering with Reliance on a 10 MW/20 MWh project set for 2025. Yet, the lack of standardisation across battery systems has led to costly errors. Minor installation mistakes—such as compromised container seals or improper fire suppression—can result in major losses. Insurers are now prioritising large-scale fire tests to assess thermal risks and scrutinising contractors responsible for system integration. Geopolitical supply chain risks remain a key concern for developers, while underwriters are focusing on single points of failure, particularly high-voltage transformers. Without consistent product standards, claims continue to rise due to unfamiliarity during installation and operation.
The shift toward high-capacity storage and sodium-ion technology marks a turning point for the industry. Insurers are responding by increasing fire testing and tightening oversight on contractors. However, with supply chain vulnerabilities and rapid innovation, the sector must balance growth with risk management in the years ahead.
