Hafslund AS is a group with ownership within the power industry. The group is fully owned by Oslo municipality. Hafslund's core business streams are hydropower, with 56 percent ownership in Norway's second largest hydropower company Hafslund Eco AS, and district heating, as majority shareholder in Norway's largest district heating company Hafslund Oslo Celsio AS. The group also owns 50 percent of Eidsiva Energi and thereby 50 percent of Norway's grid company Elvia, as well as broadband and bio heat. Hafslund AS also owns 49 percent of Fredrikstad Energi AS. The group has also ownership in Hafslund New Energy with operations within electrification and Hafslund is one of three partners in the offshore wind partnership Blåvinge together with Fred. Olsen Renewables and Ørsted.