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A completely fossil-free energy solution for Mirka factory

March 18, 2024

Mirka and the energy company Adven implement a completely fossil-free energy solution that combines ground heating, solar power and an electric boiler.

Heat production at the Mirka Oravais factory will be transformed to a completely fossil-free system. Once complete, it will reduce carbon dioxide emissions of the Oravais factory by 281 tons per year. Completion is estimated for early 2025.

The current pellet boiler as well as the backup light fuel oil boiler will be replaced with a heating system based on ground heating and solar power. The existing pellet boiler will remain as a backup alongside the new energy solution.

80 wells will be drilled on the adjacent field to form a geoenergy field for sourcing ground heat. As well as these 350-metre deep wells, the field will also accommodate a 2,5 MWp solar power plant. Heat pumps and an electric boiler will be installed in the current energy centre to replace the old oil-fired boilers. The project has been granted NextGenerationEU funding from the European Union.

Mirka favours local renewable energy

Sustainable development is at the core of Mirka’s business. Mirka seeks to favour local renewable energy and local partnerships as well as increase self-sufficiency in its energy production. This energy solution from Adven is a perfect match for Mirka’s needs.

- After a successful geoenergy based energy solution was implemented at the Jakobstad factory, we wanted to continue discussions about a similar project at our Oravais factory as well. We wanted to get rid of every drop of oil, says Mirka Project Office Manager Jari Lemberg.

- In this case, we also took advantage of the electric boiler and solar power project underway at the Jepua factory. The opportunities and challenges of energy production can always be solved together, and our cooperation with Adven is not only commercial, but full partnership, continues Lemberg.

More than two decades of partnership

Adven has produced energy for the Mirka Oravais factory since 2000. During the 20-year partnership, heat production has undergone an energy transition: first from fuel oil to pellet heating, later a heat recovery solution was added, and now heat production is solely based on renewable energy.

- This energy solution is cost-effective and carbon neutral, and at the same time it supports Mirka's ambition to be self-sufficient in its energy production, says Anssi Juvonen, Sales Manager for the Real Estate Sector at Adven.

Contact for more information:

Mirka Oy, Jari Lemberg, Project Office Manager,, +358 40 844 5036
Adven Oy, Jani Moisanen, Client Manager,, +358 40 514 9387
Adven Oy, Anssi Juvonen, Sales Manager for the Real Estate Sector,, +358 40 809 3160