Hafslund Oslo Celsio is Norway’s largest district heating provider, based in Oslo with around 200 employees, and supplies heat to more than 200,000 people. The company will be a leading force in the decarbonisation of Oslo going forward, most notably through the realization of the carbon capture project at the waste incineration facility at Klemetsrud with a capacity of capturing 400,000 tonnes of CO₂ p.a.