UK battery storage capacity is projected to triple by 2030. Is your risk strategy keeping up?

According to Energy Storage News, The UK grid-scale battery storage market grew by 45% in 2025 alone, bringing total operational capacity to nearly 13GWh.

The sector is expanding rapidly to support renewable generation and grid stability, but as projects scale, risk profiles are changing and exposures increasing . Often in ways that are not immediately visible, and often faster than the frameworks needed to manage it.

The Core Risks

Thermal runaway

Thermal runaway remains the primary cause of BESS fire incidents. It is a chain reaction, triggered by damage, manufacturing defects, environmental stress, or faults in the sub-systems that manage charging limits and cooling.

Fire and suppression design

Fires in BESS environments behave differently to conventional fires. Suppression systems designed for other hazards may not perform as expected, and once a thermal event is initiated, incidents are difficult to contain.

Off-gas detection and automatic fire systems are now installed as standard. But the industry is still developing its understanding of layered protection:

• Container spacing and stacking
• Fire barriers
• Optimum configuration of heat, smoke and fire detectors

As energy density per container rises and site footprints shrink, these design decisions are becoming increasingly consequential.

Integration risk across multiple suppliers

BESS systems rely on multiple components: batteries, inverters, battery management systems, HVAC, cooling and control platforms.

In containerised solutions, a single supplier is typically responsible for integrating these into a working whole. The rigour of that integration, how it is tested, documented and validated, varies significantly across the market.

The interfaces between sub-systems, and the assurance processes that govern them, are where most of the risk now sits.

Potential impact

High energy density comes with high consequences. BESS failures, when they do occur, are often catastrophic rather than incidental.

When an incident occurs, its severity is shaped by how multiple factors come together. Environmental exposure, system design, operational conditions and response capability all influence the outcome, and they do so simultaneously.

The consequences can spread quickly:

• Asset damage and loss of the facility
• Operational downtime and contractual penalties
• Environmental impact from contaminated run-off water
• Human safety risk to staff, first responders and neighbouring sites
• Reputational and insurability impact on the operator

Where Risk Management Goes Wrong

Four patterns repeatedly leave BESS operators exposed.

Risk is assessed in isolation, not as a system

Thermal runaway, fire, integration and operational risks are typically evaluated separately. But in practice, these risks are interdependent, and it is their interaction that drives the most severe outcomes.

The full BESS lifecycle has not yet been observed in practice

The principal risks in BESS are well understood. Thermal runaway, fire behaviour and integration failures have been documented and are the subject of active research and regulation.

But most deployed systems have not yet been through a full operational lifecycle.

The industry is still learning how known risks evolve over time, and how they interact with events such as ownership changes, retrofits and ageing components.

Risk decisions made today need to anticipate behaviour that has not yet been fully observed.

Integration risk is underestimated

BESS projects rely on multiple OEMs, contractors and control systems. Risk ownership across these interfaces is often unclear, creating blind spots that only become visible when systems are connected and operational.

Controls are not always tested under real conditions

Fire suppression, monitoring systems and response plans may exist on paper but are not always validated under realistic scenarios. When incidents occur, systems may not respond as expected, increasing the likelihood of escalation.

The result is a gap between perceived risk control and actual resilience, particularly at the points where systems interact, fail or come under stress.

What this means for operators and developers

In a high-consequence environment like BESS, you cannot build resilience by managing individual risks in isolation.

You need a structured, system-level approach that reflects how your assets are designed, delivered and operated in reality, especially as technologies, standards and regulatory expectations continue to evolve.

That starts with a clearer view of where vulnerabilities sit, how incidents can develop and whether your controls are strong enough to perform under real-world conditions.

A stronger approach helps you:

• Understand how risks interact across technology, construction and operations, not just where they sit
• Identify exposure at critical points such as design, integration and commissioning, where failure is most likely to occur
• Apply emerging best practice in ways that align with evolving regulatory expectations and project realities
• Test whether your control and response strategies are built to perform under realistic conditions, and where underlying assumptions need to be challenged
• Strengthen your risk profile to support insurability, stakeholder confidence and investment decisions

As BESS scales, resilience is no longer just a technical requirement. It is central to protecting performance, confidence and long-term commercial viability.

Learn more about our Construction services.