Energy storage for months at a time.

The first commercial-scale AirBattery project in Germany is to be built by Augwind Energy. The facility will be the world’s first industrial-scale operational installation of Augwind’s AirBattery Hydraulic Compressed Air Energy Storage (CAES) technology designed specifically for grid-scale storage for up to months at a time - a game-changer for the global energy transition.

In regions in central Europe, long periods of low solar and wind output known as ‘Dunkelflautes’ severely challenge grid stability. Augwind’s AirBattery offers a resilient buffer, providing backup for up to months helping utilities, grid operators and traders to deal with renewables intermittency and stabilise electricity markets.

Or Yogov

“This is more than a project; it’s a milestone for achieving net zero," declares Or Yogov, Founder & CEO of Augwind (pictured).  "With the AirBattery, we’re introducing a storage solution that finally matches the scale and rhythm of renewable energy. Germany’s redundant salt caverns, industrial leadership, and climate ambition make it the perfect launchpad for our first commercial deployment. Our goal is to become Europe’s preferred partner for multiweek storage solutions. With this German launch, we are proving that long term energy storage to balance the grid is not only technically feasible, but it’s economically sound.”

This revolutionary AirBattery system combines two well-established technologies in an innovative way: it merges pumped hydroelectric principles with compressed air storage, circulating water between underground chambers to compress and decompress air at vast scales (see video below).

Excess energy is used to compress air to pressures from 50 bar all the way to above 200 bar, depending on the demand and geomorphic structure of the cavern, and feed the pressurised air into vast underground caverns, larger than the Empire State building. The excess renewable energy is effectively stored for times that the sun doesn’t shine, and the wind doesn't blow with a typical cavern having the potential to store enough compressed air to generate 3-8 GWh of electricity.

The energy is recovered from the system by simply returning the high-pressure air back through the water filled chambers, streaming the water to spin a turbine and generate electricity. Augwind has already reached a 47% AC-to-AC round-trip efficiency at its AirBattery demonstration facility in Israel, validating that commercial installations will exceed 60%.

Their first commercial scale AirBattery facility will be built in Germany and will utilize a mined salt cavern suited for such long-duration energy storage. The cavern will serve as a low-cost, high-capacity compressed-air reservoir, enabling scalable and cost-effective energy storage for up to several months, a vital capability as Europe races to increase renewable energy penetration beyond 50%.

With an initial target commissioning window of 2027–2028, Augwind is now working closely with local cavern owners, utilities, energy traders and industrial off takers to secure permitting and finalize the system design. The project will not only showcase the techno-economic viability of Augwind’s Hydraulic CAES but also lay the groundwork for broader deployment across Europe by 2030.

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