Meet the Partners

Hafslund Oslo Celsio

Norway's largest supplier of district heating

Introducing Hafslund Oslo Celsio

Hafslund Oslo Celsio is the largest supplier of district heating in Norway and supplied 36% of the district heating generated in Norway in 2021. It sold 1.8 TWh of district heating and generated 0.1 TWh of electricity. Celsio’s waste-to-energy plant at Klemetsrud, Oslo, is Norway’s largest with a capacity to end-treat 315,000 tonnes of waste per year. The company is also expanding its activities to district cooling and fiber networks. The company employs approximately 200 people. 

Fortum's waste-to-energy plant

From Fortum Oslo Varme to Hafslund Oslo Celsio

The company was previously known as Fortum Oslo Varme, but on 19 May 2022, Fortum sold its 50% ownership in the company to a Norwegian investor consortium comprising Hafslund Eco, Infranode and HitecVision for approximately EUR 1 billion, which gave the company the new name Hafslund Oslo Celsio.

How Hafslund Oslo Celsio works with CCS

Hafslund Oslo Celsio is developing the world’s first full-scale carbon capture and storage (CCS) project for waste-to-energy. When realized, it will be a state-of-the-art facility providing carbon negative end-treatment of residual waste. The plant will be a demonstration plant for European cities and citizens aiming to reduce emissions and solve their waste problems. 

As part of the Norwegian full scale CCS project, Longship, Hafslund Oslo Celsio is planning to equip its waste-to-energy plant with a carbon capture facility and capture up to 400,000 tonnes of CO₂ every year. The plant incinerates residual waste that cannot or should not be recycled, and recovers the energy for electricity production and district heating. As around 50 % of the waste incinerated at the plant comes from biogenic sources, such as unsorted or contaminated food waste, textiles, wood and paper/cardboard, the project will remove large amounts of CO₂ from the natural carbon cycle. These reductions represent valuable negative emissions, or carbon removals, and can be used to neutralize emissions from hard-to-abate sectors such as cement, steel, plastics, aviation, shipping, and heavy road transport.

Man catching cloud of CO2 with a net.

Our contribution to ACCSESS

Celsio has made its CCS pilot plant available for the ACCSESS project. The pilot will be modified to fit the process with Potassium Carbonate and an enzyme as CO₂ absorbant. With the modified pilot, carbon capture will be tested with real flue gas from Celsio’s waste-to-energy plant for several months and capture about two tonnes of CO₂ per day. When the first pilot testing is finished at Klemetsrud, the pilot will go on a European tour to test the capture technology on flue gasses from different industries, such as cement and pulp and paper.


Markus Hole, Public Affairs Manager

Hafslund Oslo Celsio's CCS pilot before being repurposed for use in the ACCSESS project.