Ten leading cleantech and energy storage organisations are calling on EU leaders to recognise long-duration energy storage (LDES) as a key asset for competitiveness, energy security and a clean industrial future.

The call came just weeks after the European Commission proposed a fresh package of support to encourage private investments in LDES projects and “novel” renewables.

However, in a recent letter sent to Commission chiefs, LDES campaigners including Flow Batteries Europe said existing electricity markets do not adequately reward the long-term system value provided by LDES technologies ― despite their potential to lower system costs, accelerate renewable integration and reduce exposure to volatile fossil fuel markets.

Signatories to the letter, sent to energy and housing commissioner Dan Jørgensen and two Commission executive vice presidents, said LDES technologies’ ability to store and dispatch electricity for eight hours or more provides much-needed flexibility to balance power systems.

In addition, LDES represents a strategic industrial opportunity for Europe ― supporting innovative manufacturing and component supply chains already established across the European continent.

The EU should develop an LDES roadmap and encourage revenue certainty mechanisms for supporting technologies, the letter said.

“Europe should not build the next phase of clean-energy demand while allowing the corresponding value chains to scale elsewhere.”

According to an LDES Council report released in December 2025, long duration energy storage systems are moving rapidly toward bankability, with clearer pathways for investment than ever before.