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In 1961-1962 NWK collaborated with the Danish utility Det Jyskfynske Elsamarbedje ( ELSAM ; now  DONG Energy  ) in the completion of the 220kV link from Flensburg to Aabenraa in  Denmark  : a further link between the power station at Schilling and Audorf was also under construction .
 country of headquarters: DONG Energy, Denmark
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  DONG Energy, Denmark 
Answer:
 country of headquarters: DONG Energy, Denmark