The opening of the Poet-DSM cellulosic ethanol plant in Emmetsburg next month will have a flyover, entertainment and lunch – and now a touch of royalty has been added to the festivities.

Willem-Alexander Claus George Ferdinand, King of the Netherlands, will attend the opening of the facility on Sept. 3, Poet-DSM said in a statement Thursday.

The project, called Project Liberty, is a partnership between Poet, a South Dakota-based maker of ethanol, and DSM Royal, a Dutch maker of enzymes. The $250 million project will use 770 tons of corn cobs, leaves, husk and stalks daily to produce 20 million gallons of cellulosic ethanol a year, later ramping up to 25 million gallons per year.