Long-Standing Cooperation at the Ostrołęka Mill
The order reflects the long-standing cooperation between Valmet and Stora Enso at the Ostrołęka mill. Since delivering the original CFB boiler in 2010, Valmet has supported the mill through lifecycle services and modernization projects that help maintain reliable and cost-effective operation. This latest investment supports the mill’s continued efforts to increase the use of refuse-derived fuel (RDF) while improving boiler availability and operational performance.
Upgrade Supports Reliable Operation with Higher RDF Use
Circularity and resource efficiency are central to Stora Enso and the Ostrołęka mill. As the boiler’s use of refuse-derived fuel has increased, new operational needs have emerged in the bottom ash area. This upgrade is expected to improve boiler availability, reduce maintenance shutdowns, and lower operating costs through more efficient material handling and reduced sand consumption.
Przemysław NiedźwieckiEngineering and Investments Manager, Stora Enso Narew Sp. z o.o.
Valmet’s delivery will include the replacement of the boiler bottom, an upgraded coarse material removal system, and a new bottom ash sieving system. The delivery also includes spare parts for two years to support a smooth start-up and long-term operational performance.
Installation During the Mill’s Annual Shutdown in 2027
As the share of refuse-derived fuel has increased at the Ostrołęka mill over the years, the operating conditions of the boiler have also changed. This upgrade addresses a specific operational challenge by improving coarse material removal and supporting more stable boiler operation. The project is a good example of how targeted lifecycle services and modernization investments can help customers improve availability, reduce maintenance-related shutdowns, and maximize the long-term value of existing boiler assets.
Jouni KoskinenSenior Manager, Rebuild and Conversion Technologies, Pulp, Energy and Circularity business area, Valmet
The order was included in Valmet’s orders received for the third quarter of 2026. The value of the order will not be disclosed. The upgraded equipment is scheduled to be installed during the mill’s annual shutdown in June–July 2027.
About the Customer
Stora Enso’s Ostrołęka mill in Poland is part of the company’s Packaging Materials business. The integrated site produces recycled containerboard and kraft paper and includes energy production facilities that support efficient and reliable mill operations.
