As Europe continues its urgent shift toward renewable energy, the spotlight is increasingly falling on long-duration energy storage (LDES). While solar and wind provide clean power, they don’t always align with peak demand. This makes storage not just an accessory—but a necessity—for a resilient, low-carbon grid.

Among the contenders, flow batteries are emerging as a critical solution.

Unlike lithium-ion systems, which are often optimised for short bursts of energy, flow batteries excel in applications that require several hours or even days of consistent discharge. Their secret lies in separating power and energy components—allowing storage capacity to scale simply by increasing the electrolyte volume. This makes them uniquely suited to grid-scale projects, backup systems, and remote or unstable energy networks.

Why Flow Batteries Are Gaining Ground

There are several compelling reasons why governments and utilities across Europe are now considering flow batteries:

• Longevity: Flow batteries can last 20 years or more, with minimal degradation over time. This drastically reduces lifecycle costs.

• Safety: Without the risk of thermal runaway, flow batteries offer a safer alternative to lithium-ion in high-temperature or sensitive environments.

• Sustainability: Many flow battery chemistries use recyclable and abundant materials, supporting Europe’s push for a circular economy.

• Scalability: Energy storage can be scaled independently of power capacity, making these batteries adaptable for diverse use cases.

Europe’s Turning Point

Recent developments show momentum is building. National energy strategies are beginning to recognise that net-zero targets cannot be met without robust, long-duration storage. Flow batteries are now being installed in cross-border grid projects designed to stabilise supply and support deeper renewable integration.

Yet to accelerate adoption, the sector needs:

• Stronger policy support that acknowledges the unique role of LDES.

• Clear regulatory frameworks that include flow batteries in capacity and resilience planning.

• Dedicated investment and support for demonstration projects.

Europe has the engineering expertise, the materials, and the climate imperative. What’s required now is aligned action – turning potential into infrastructure.

Read more about the importance of flow batteries in Europe’s energy future in this LinkedIn post.