High Quality Content by WIKIPEDIA articles! GKK Etzenricht, abbreviation for Gleichstromkurzkupplung) Etzenricht, that means Etzenricht HVDC-back-to-back station was an HVDC back-to-back facility near Etzenricht in the district of Neustadt in Bavaria, Germany. It was built up on area of Etzenricht substation, a 380 kV/220 kV/110 kV-substation, which went in service in 1970 and expanded afterwards several times. The operator of this facility, which was used between 1993 and 1995 for exchange of power between Germany and Czech was Bayernwerk AG (now E.ON Netz GmbH).