The production and storage of natural gas is realised by around 3,600 rigs and 20 compression stations. Romgaz owns a total of 153 commercial reservoirs located in Transylvania, Moldavia and Muntenia with around 75% or 114 being located in Transylvania especially in Mureş and Sibiu counties. The company produced in 2009 5.76 cubic kilometers of natural gas and expects a 5% decrease in production for 2010 to around 5.65 cubic kilometers. The company operates several large natural gas fields like Bazna, Brodina, Caragele, Copşa Mică, Deleni, Filitelnic, Grădiştea, Laslău Mare, Mamu, Roman-Secuieni, Şamşud, Sărmaşel, Sighişoara and Zau de Câmpie with combined reserves exceeding 4.351 TCF (112 km³).