Nuclear power

Nuclear power, which meets about half of Sweden’s power demand, plays an important role in its energy supply. Uniper is the majority owner of the nuclear power plant (NPP) Oskarshamn and a minority owner of the Ringhals and Forsmark NPPs. We also own Barsebäck, Sweden’s first commercial NPP, which has been decommissioned and is currently being dismantled. The highest priorities of our nuclear power business are responsibility and safety.

Together with nuclear power, hydroelectricity meets Sweden’s baseload needs. Our low-carbon hydro plants provide both stability and flexibility to the country’s energy system.

To keep Swedish industry running, it needs a reliable supply of electricity 24/7. That’s why our experts focus on delivering the secure, sustainable, and competitively priced energy that Sweden and its industry depend on.


Uniper is the third-largest hydropower producer in Sweden. From Sundsvall, we manage 76 run-of-river plants, located from Lycksele in the North to Kristianstad in the South.

The plants have a combined capacity of about 1,600 MW and an average annual output of 8 TWh; this is about 12% of Sweden's total hydropower production.

The oldest power plant still in operation is Hemsjö Övre in Mörrumsån, commissioned in 1907.

Open-cycle gas turbines (OCGTs)

We own and operate seven open-cycle gas turbines (OCGTs) in the South of Sweden, with a combined installed capacity of 500 MW.

The largest machine is G12 in Halmstad, commissioned in 1993. The other OCGTs were commissioned between 1971 and 1974.

The OCGTs are part of the Swedish disturbance reserve and run on light fuel oil.

Power plants in Sweden

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Showing 4 of 4 facilities
Country Installed capacity
Barsebäck Sweden 0MWe
Hydro powerplants in Sweden Sweden -
Karlshamn Sweden 662MWe
OKG Sweden 1400MWe

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Hydropower has many advantages. It has near-zero emissions of greenhouse gases, while providing a reliable electricity supply at a competitive price. Hydropower is renewable, because the water that is utilized by the power plant is not consumed, but constantly returned in the form of precipitation.

Nuclear power plays an important role in stabilizing Sweden’s electricity generation. Uniper takes total responsibility for our participation in Swedish nuclear power. 

Hydrogen is not an energy source in itself, but just like electricity it is an energy carrier. It can therefore not be determined to be renewable, fossil-free or fossil without knowledge about the production process – it can be any of these things, depending entirely on how it is manufactured. 

Our global presence

We continue to strengthen our presence in key markets, develop innovative solutions and acquire companies in prioritized areas. Uniper solutions are sold to over 100 countries and we currently operate in over 40 countries.