Airengy and Nobian have entered into a strategic agreement to evaluate and develop a compressed air power plant (CAPP) with a storage capacity of approximately 2.5GWh in Denmark.
The collaboration will evaluate the use of compressed air energy storage (CAES) in a salt cavern connected to the CAPP technology project.
The companies aim to determine the viability and potential of deploying Airengy’s CAES technology, known as AirBattery, at a site operated by Nobian Dansk Salt.
The concept involves using excess renewable electricity to compress air and store it underground in salt caverns, which can then be released to generate power when required.
According to Nobian, salt caverns are effective for large-scale energy storage due to their sealing capabilities and suitability for storing gases at high pressure.
Both companies will conduct assessments and testing to examine the technical feasibility of this approach.
The collaboration aligns with Nobian’s ongoing efforts to establish large-scale energy storage as a key component of future renewable energy systems.
Nobian, which describes itself as active in high purity salt production and underground energy storage, sees potential for salt caverns to support the wider integration of renewable power sources by balancing supply and demand.
Nobian energy storage director Louwrens op de Beek said: “By exploring the combination of our salt cavern expertise with Airengy’s innovative technology, we aim to unlock new ways to store and release energy over longer periods, helping to reduce grid congestion.
“This collaboration fits perfectly with our Grow Greener Together strategy and our ambition to be a balancing partner in the energy system in Denmark.”
Airengy has identified Denmark as one of four key early adoption markets for CAPP technology, alongside the UK, Germany and the Netherlands.
The company said that Denmark’s high share of electricity from renewable sources, accounting for 79.7% in 2024, is driving demand for long-duration storage that can support grid flexibility.
The agreement marks a further step for both companies as they seek to develop scalable infrastructure to enable broader use of renewable energy in Denmark and potentially across Europe.
Airengy chairman Yiftah Ron-Tal said: “The agreement with Nobian continues and advances our deployment into our European target markets and proves the company's implementation capabilities.
“The collaboration connects Airengy's energy-storage technology with existing geological infrastructure and industry know-how and demonstrates our ability to create partnerships with leading companies in strategic markets.”
