Helsinki (News release) - UPM Energy makes the second phase investment in its innovative ultracapacitor project, which will further strengthen the ability of hydropower to balance the grid. The new installation will be located next to the Kuusankoski hydropower plant and is expected to be operational by summer 2025.

The system was successfully piloted at the Katerma hydropower site in 2022 and the concept is now being replicated at Kuusankoski. The Kuusankoski ultracapacitor system will enable UPM Energy to provide faster reserves through short-term energy storage, responding to grid balancing needs in mere milliseconds.

This responsiveness is crucial as the transmission grid operators are trying to cope with the increased volatility in electricity supply. This has been brought about by the rapid growth of weather-dependent renewable energy sources, such as wind and solar power.

Innovative technology for a sustainable future

UPM Energy is the second largest electricity producer in Finland, and 99% of its portfolio is CO2-free. The Kuusankoski project will utilise modern digital systems and automation processes to optimise the performance of the energy system and provide more balancing power to the grid.

"The ultracapacitor concept has proven its capability at Katerma and it will be an essential part of the hydropower generation," says Antti Raukola, project manager at UPM Energy. "This technology is not just about innovation, but also about preparing for the future of grid balancing."

Ultracapacitors are known for their ability to discharge at high power and react in milliseconds without losing capacity. They are maintenance free and have a significantly longer lifetime than batteries, making them an ideal choice for sustainable energy solutions.

UPM Energy plays an important role in Finland's zero-carbon electricity generation and aims to continuously strengthen its ability to meet the evolving needs of the electricity market. The construction of the Kuusankoski ultracapacitor system is another milestone on the road to a future beyond fossils.