SEFE Energy is a gas distribution company located in Kassel, Germany.

[3][4] SEFE Energy operates in Germany, Belgium, Denmark, France, the United Kingdom, Austria, the Netherlands and the Czech Republic.

[citation needed] Wingas's subsidiary Astora GmbH & Co. KG operates the Western Europe largest natural gas storage facility in Rehden, North Germany, with a working gas volume of 4.4 billion cubic metres (160 billion cubic feet) and represents roughly a fifth of the entire storage capacity in Germany.

Another large gas storage facility with capacity of 2.6 billion cubic metres (92 billion cubic feet) is the Haidach gas storage.

[6][7] Besides natural gas, Wingas leases the free transmission capacity in fiber-optic cables to commercial customers.