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The 600 MW HVDC back-to-back station at Etzericht connects the 420 kV transmission systems of Bayernwerk AG in Bavaria, Germany (UCPTE network) and the Czech power utility CEZ (CENTREL network). The station went into commercial operation in June 1993. To link the 420 kV transmission systems of Osterreichische Elektrizitatswirtschafts-AG in Austria (UCPTE network) with the Hungarian power utility MVM Rt. (CENTREL network) the 600 MW HVDC back-to-back station Vienna Southeast was commissioned in June 1993. The HVDC back-to-back stations at Etzenricht/Germany and Vienna Southeast/Austria have now been in operation since they were completed in 1993. This report describes the measures taken in considering the levels of availability and reliability of the two installations. The in service experiences gained during network operation is evaluated here in detail, and confirm the effectiveness of the measures taken. The report also discusses other constructive proposals made on the basis of operating results.