Tulikivi will supply crushed soapstone to Loviisan Lämpö´s thermal energy storage in co-operation with Polar Night Energy

Polar Night Energy and the Finnish district heating company, Loviisan Lämpö, have entered into an agreement to build an industrial-scale Sand Battery in Pornainen for Loviisan Lämpö’s  district heating network. The heating power of the new Sand Battery is 1 MW and it can store up to 100 MWh of thermal energy.

The Sand Battery-technology developed by Polar Night Energy is flexible in both its electricity usage and district heating production. It is charged from the electric grid using charging algorithms developed by Polar Night Energy, minimizing the cost of electricity used for charging while meeting the heat demand of the district heating network. The thermal energy storage capacity corresponds to almost one-month heat demand in summer and a one-week demand in winter in Pornainen.

In previous projects the material has been sand, but the Polar Night Energy technology can use sand or sand-like materials as the storage material. Soapstone conducts heat better than conventional sand. According to research conducted by Polar Night Energy and Tulikivi, soapstone is an excellent choice for Loviisan Lämpö’s Sand Battery due to its unique properties.

The Loviissa heatstorage contains 2000 tons of soapstone, which equals the weight of 1000 heatstoring Tulikivi fireplaces.

"Collaborating with Polar Night Energy is an interesting venture into new business, leveraging the traditional strengths of soapstone, such as excellent heat conduction and retention properties. This collaboration supports Tulikivi's goals of maximizing the utilization of raw materials," says Heikki Vauhkonen, CEO of Tulikivi.

Sand Batteries can use sand or sand-like materials as the storage material. Soapstone conducts heat better than conventional sand. According to research conducted by Polar Night Energy and Tulikivi, soapstone is an excellent choice for Loviisan Lämpö’s Sand Battery due to its unique properties.

"We always choose the thermal energy storage medium based on the customer's needs. Examining and testing different materials is crucial for us to use materials that are suitable in terms of properties, cost-effectiveness, and promotion of circular economy," says Liisa Naskali of Polar Night Energy and adds, "Tulikivi is a well-known and traditional company. The soapstone they use is a very Finnish thing. It's great to collaborate with Tulikivi."

Loviisan Lämpö is owned by CapMan Infra fund, a part of the investment company CapMan. CapMan's vision is to be the most responsible private assets investor in the Nordics, committed to creating a sustainable future by addressing climate challenges and utilizing resources efficiently.

"Loviisan Lämpö’s investment in the Sand Battery is a concrete step towards CapMan's climate goals. We are committed to reducing our carbon dioxide emissions and seeking solutions that lead us towards net-zero emissions, of which this innovative solution is an excellent example," says Sauli Antila, Investment Director at CapMan Infra.