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Which were the milestones of electric power transmission in Poland? I only know the last, which are, the construction of 750 kV line from Widelka to Ukraine ( there is no such line in Western Europe!) in 1985 and the inaugauration of the first HVDC line, the SwePol link to Sweden in 2000.
When was the first 400 kV, the first 220 kV and the first 110 kV line in Poland built? In Germany, the first 110 kV line went in service in 1912 ( Lauchhammer-Riesa), the first 220 kV line went in service in 1923 ( Ronsdorf-Letmathe) and the first 400 kV line went in service in 1957 ( Hoheneck-Rommerskirchen).
 
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