Norwegian generating company, almost taken over by Fortum in 2004 (Fortum offered EUR660m to the city of Oslo, which would have raised Fortum's stake to 87.8%; but political opposiiton prevented a deal). Oslo has a 53.7% stake.
Vattenfall bought 20% stake in January 1997 (more precisely, 12% of the company share which entitled Vattenfall to 20 % of voting rights).
Hafslund in the late 1990s was one of the three market makers on the Nord Pool, along with Enron and Interkraft.
In 1998 Hafslund became the second foreign company to be licensed to trade electricity in Spain.