7Fields gas storage facility
7Fields was planned and built by RAG under its concession. RAG operates the facility for German partner Uniper Energy Storage (formerly E.ON Gas Storage). RAG Energy Storage and Uniper market the capacity of this interconnected storage network. The first expansion phase began in 2009 and was completed in 2011. Following completion of the second expansion stage in 2014 and a capacity adjustment in 2019, around 2.1 bn cu m of natural gas can now be stored at 7Fields. It has an injection capacity of 698,300 cu m/hour (7.8 GW) and a withdrawal capacity of 1,033,900 cu m/hour (11.7 GW). 7Fields is made up of former gas fields in Upper Austria and Salzburg. Integration of several storage reservoirs into an interconnected storage facility is particularly resource efficient and environmentally friendly. The site is unique in Europe, with five storage stations connected via pipelines to three metering stations and to the Austrian and international gas grids.