▁( former ly ▁D ONG ▁Energy ) ▁is ▁a ▁power ▁company ▁based ▁in ▁Freder icia , ▁Den mark . ▁It ▁is ▁the ▁largest ▁energy ▁company ▁in ▁Den mark . ▁ ▁The ▁company ▁adopted ▁its ▁current ▁name ▁on ▁ 6 ▁November ▁ 2 0 1 7 . ▁ ▁History ▁The ▁Dan ish ▁state - owned ▁company ▁Dans k ▁Natur gas ▁A / S ▁was ▁founded ▁in ▁ 1 9 7 2 ▁to ▁manage ▁gas ▁and ▁oil ▁resources ▁in ▁the ▁Dan ish ▁sector ▁of ▁the ▁North ▁Sea . ▁After ▁some ▁years , ▁the ▁company ▁was ▁renamed ▁to ▁Dans k ▁O lie ▁og ▁Natur gas ▁A / S ▁( D ONG ), ▁meaning ▁Dan ish ▁O il ▁and ▁Natural ▁Gas . ▁At ▁the ▁beginning ▁of ▁the ▁de cade ▁of ▁the ▁ 2 0 0 0 s , ▁D ONG ▁started ▁to ▁expand ▁itself ▁into ▁the ▁electric ity ▁market ▁by ▁taking ▁long ▁positions ▁in ▁electric ity ▁companies . ▁In ▁ 2 0 0 5 , ▁D ONG ▁acquired ▁and ▁merged ▁Dan ish ▁elect rical ▁power ▁produ cers ▁Els am ▁and ▁Ener gi ▁E 2 ▁and ▁public ▁utility ▁( elect ric ity ▁distribution ) ▁companies ▁N ES A , ▁K ø ben hav ns ▁Ener gi ▁and ▁Freder iks berg ▁F ors yn ing . ▁The ▁result ▁of ▁the ▁mer ger ▁was ▁the ▁creation ▁of ▁D ONG ▁Energy . ▁The ▁mer ger ▁was ▁approved ▁by ▁the ▁European ▁Commission ▁on ▁ 1 4 ▁March ▁ 2 0 0 6 . ▁ ▁In ▁ 2 0 0 2 , ▁one