the company set the price range for the float at between 83.5 billion and 106.5 billion kroner (£8.5 billion-£10.9 billion) after revealing it two weeks ago.
Dong began life in 1972 and the current group was established in 2006 through the merger of six Danish energy companies.
But a float was delayed that year due to a European merger probe and then in 2008 when the financial crisis sent shock waves through equity markets.
The sale of a stake in the business to Goldman Sachs in 2014 caused a Borgen-style political storm and led to the Socialists pulling out of the ruling coalition.
Denmark has a 58.8% stake and Goldman Sachs 17.9%. Up to 17.4% of the shares in Dong, led by chief executive Henrik Poulsen, will be sold.
The float will trigger a fees bonanza with JPMorgan, Morgan Stanley and Nordea the bookrunners. Rothschild is advising the Danish government.
