Key risk lessons from a year of building and insuring BESS projects

As this year comes to a close, one thing stands out clearly from our work at Renewable Energy Insurance Broker: the challenges shaping BESS projects today are not just about technology, they are equally about financial resilience.

Over the past year, we’ve been involved in projects across different markets, development stages, and regulatory environments. What connects them all is a growing realization among developers, investors, and lenders: bankability is no longer assumed, it has to be deliberately built.

Looking back at the year, here are the key risk lessons that consistently defined which projects moved forward smoothly, and which struggled.

1. Financial risk starts long before COD (Commercial Operation Date)

One of the most persistent misconceptions we still encounter is that financial risk begins once a project is operational. In reality, exposure begins much earlier, during logistics, installation, and commissioning. Delays in delivery, incidents during construction, or setbacks during testing don’t just affect schedules, they affect cash flow, financing assumptions, and investor confidence.

This year reinforced a simple truth: time risk is financial risk.

2. Cargo and construction risks can no longer be treated as secondary

Battery systems and key electrical components are high-value, long-lead assets. When something goes wrong during transport or on-site, the consequences extend far beyond equipment replacement.

Projects that treated cargo and construction risks as purely technical often found themselves exposed when timelines shifted. Those who addressed the financial impact of delay early were far better positioned to absorb disruptions.

3. Business Interruption is about how revenue is earned, not just whether a system is online

BESS projects don’t fail in simple, binary ways. Reduced availability, partial degradation, grid limitations, or external disruptions can all affect income without a full shutdown.

This year highlighted the limitations of generic BI structures. The projects that proved most resilient were those where insurance reflected real revenue mechanisms, not theoretical ones, acknowledging that performance risk doesn’t always mean total failure.

4. Early insurance involvement changes project outcomes

One of the clearest lessons from this year is that insurance works best when it’s involved before final decisions are locked in.

Layout, design, commissioning strategy, and risk allocation all influence insurability. When insurance is treated as a late-stage requirement, it often leads to exclusions, redesigns, or delays. When it’s integrated early, it becomes a decision-support tool, not a constraint.

5. Bankability is becoming the real differentiator

Technology is advancing quickly, and storage capacity is scaling across Europe. But in practice, the projects that progressed fastest this year shared one common trait: financial resilience built into the structure from the start.

Investors and lenders are increasingly aligned around a single question: Can this project withstand delays, disruptions, and performance volatility without breaking its financial model?

Those that can answer “yes” are setting the pace.

What we’re taking into 2026

This year confirmed what REIB has believed for a long time: insurance for BESS projects isn’t about saying “no” to risk, it’s about structuring projects so risk is understood, priced, and managed from the start.

As storage continues to scale across Europe and beyond, financial protection will matter just as much as technical performance. And that’s why, going into the new year, we continue to stand by a simple principle:

🔋 Say Yes To BESS, but say yes with the right structure behind it.

A Year-End Reflection from the REIB Team

As we close this year, we want to thank our partners, clients, insurers, and collaborators across Europe for the trust, conversations, and shared learning. Building and insuring BESS projects is still a relatively young field, and every project adds to the collective experience.

We’re looking forward to continuing this work in the year ahead: helping projects move from ambition to bankability, with clarity, realism, and the right risk framework in place.

See you in the new year🙂,

The REIB Team