London: Dong Energy is selling half of the Anholt offshore wind farm to two big Danish pension insurance groups, building on its success in attracting institutional investors. PensionDanmark will buy a 30% stake in the 400MW project and PKA will take 20%, for a combined DKr6bn ($1.13bn). Payments are to be made in four instalments between the end of 2011 and the end of 2013.