The PGE Group was founded as Polskie Sieci Elektroenergetyczne S.A. (translates as Polish Electrical Power Lines S.A.) in 1990. In 2007 the Transmission System Operator division (PSE-Operator) was separated from the PSE S.A. group. On 9 May 2007 Polska Grupa Energetyczna was established by the merger of PSE, PGE Energia SA and BOT Górnictwo i Energetyka S.A.[5] 6 November 2009 IPO in Warsaw Stock Exchange.