Energy storage with systemic impact

Our subsidiary, SEFE Storage, is one of Europe’s largest operators of natural gas storage facilities. With a working gas volume of around six billion cubic metres, SEFE Storage balances seasonal fluctuations and enables short-term market optimisation, while paving the way for the transition to a hydrogen-based economy. The aim is to ensure security of supply and flexibility – today and in the future.

Flexible storage, reliable supply

SEFE Storage offers a wide range of storage products and supplementary services, including auctions and additional capacity options. The portfolio covers the full spectrum of storage applications. SEFE Storage’s experts are here to help you plan and select the right options for your needs.

Transparent allocation of storage capacity

You can acquire storage capacity through pay-as-bid auctions on the PRISMA trading platform. Bids are submitted anonymously, and the allocation process is automated. All participants receive the results minutes after the auction ends. Short-term storage products are generally allocated on a first come, first served (FCFS) basis.

Additional capacity and services for greater flexibility

Boost your storage contracts by booking additional capacity on PRISMA, available 24/7 at fixed prices with minimal lead time. Alongside fixed contracts, SEFE Storage also offers interruptible services.

Additional services for storage customers

Time is money – that’s why we handle storage level reporting to the authorities for you. And our transfer services offer a wide range of options, from gas-in-store transactions – the transfer of stored gas – to secondary trading and contract assignments.

Hydrogen storage for tomorrow

At its Jemgum site, SEFE Storage is developing a hydrogen cavern with a planned capacity of 150 million normal cubic metres, set to be operational from 2032. This facility will be a vital component in Germany’s hydrogen infrastructure, enabling secure underground storage in salt formations. Jemgum is located near the national hydrogen core network, which will link production and demand areas in the future.

Existing infrastructure will be used for in-situ leaching (creating artificial cavities in the salt dome), while a new facility will be constructed for injection and withdrawal. The approval process includes an environmental impact assessment with public participation.

An overview of SEFE Storage’s sites

Natural gas storage facilities are essential for a secure and flexible energy supply. They help mitigate seasonal fluctuations, enable short-term optimisation and enhance the stability of the energy system. SEFE Storage’s facilities combine high availability with state-of-the-art technology, offering a diverse portfolio of storage capacities to meet a wide range of requirements.

Jemgum: highly flexible cavern storage

Operational since 2013, Jemgum is one of Germany’s largest cavern storage facilities, with a working gas volume of 900 million m³. The salt caverns allow fast injection and withdrawal rates of up to one million m3 of gas per hour, making them ideal for use in conjunction with renewable energy sources. Jemgum is connected to the transmission networks of GASCADE (THE market area) and Gasunie (TTF market area).

Rehden: porous storage of systemic importance

With around four billion m³ of working gas capacity, Rehden is one of the largest porous storage facilities in Western Europe, accounting for around one fifth of Germany’s total storage capacity. Originally a natural gas reservoir, the site was converted into a storage facility in 1993. Rehden is directly linked to the transmission network of SEFE subsidiary GASCADE via the MIDAL (Mitte-Deutschland-Anbindungsleitung) pipeline and is located close to the RHG (Rehden–Hamburg) and NEL (North European natural gas) pipelines.

Haidach: integrated into the European market

Located in Austria, the Haidach storage facility has a capacity of approximately three billion m³ of natural gas, enough to supply around 1.4 million single-family homes for one year. SEFE Storage markets 55 % of this capacity. Haidach connects to the German high-pressure gas grid via the Burghausen/Haiming hub. Commercial access to the German gas market is currently facilitated by network operators Bayernets GmbH and Open Grid Europe GmbH.