Metsa Fibre to supply Rauma mill waste heat to city network from December

Metsa Fibre and local utility Rauman Energia are commissioning a district heating station at the Rauma pulp mill in Finland, with testing starting in early December 2026 and production use targeted by the end of that month. The station will recover surplus heat from the mill's recovery boiler that was previously dissipated through cooling towers, supplying an estimated 10-20% of Rauman Energia's total heat demand.

Why this mattersThe project illustrates pulp mills monetising surplus process heat through local energy partnerships, cutting cooling costs while diversifying municipal heat supply.

• Testing of the new district heating station begins in early December 2026, with production use targeted by month end.
• The recovered heat comes from the mill's recovery boiler, from surplus steam previously cooled via cooling towers.
• The project is estimated to cover approximately 10-20% of Rauman Energia's total heat demand.
• Connection points were built into the mill's steam and condensate systems during the 2025 annual maintenance shutdown.
• Construction of the district heating pipelines at the mill site started in January 2026 and installation was completed in spring 2026.

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