Cleaner district heating

At Tampereen Energia, we produce district heating locally, mainly at our Naistenlahti and Lielahti power plants, and at the Tammervoima utility power plant using combined heat and power production. In addition, we produce heat at numerous heating plants in different parts of our operating area.

In 2025, 83 % of the energy sources we used to produce district heating were renewable. We are increasingly utilizing wood-based materials in heat production, including wood residues from forest processing and pellets. We also obtain waste heat from other sources, including from data centres, from the flue gases of our power plants using flue gas scrubbers, and from the processes of industrial companies. We also produce heat using electric boilers powered by wind energy. At Tammervoima, we produce heat from mixed waste.

Coal is not and has never been used in the production of district heating in Tampere.

Find out more about taxes on fuels used in district heating production:

https://www.vero.fi/en/businesses-and-corporations/taxes-and-charges/excise-taxation/sahkovero/Tax-rates-on-electricity-and-certain-fuels

District heat production energy sources, all, 2025

District heat production energy sources, renewable and fossil 2025

*Guarantees of Origin have not been obtained for district heat produced using electric boilers, so it is not officially renewable. It is also not fossil.

District cooling directly from Lake Näsijärvi

All the district cooling we produce is renewable.

District cooling water is taken directly from Lake Näsijärvi (free cooling). During the summer, some renewable electricity is used to cool the water in the district cooling network.

District heat production energy sources, all, 2025

What is a Guarantee of Origin?

Guarantees of Origin verify the origin of renewable energy

We certify the origin of electricity, district heating and district cooling produced from renewable energy sources with official Guarantees of Origin. In Finland, the Guarantee of Origin system is maintained by Finextra Oy, which is owned by the grid company Fingrid, and supervised by the Energy Authority (Energiavirasto).

  • A Guarantee of Origin is an electronic document which certifies that energy sold as renewable has been produced from renewable energy sources.
  • Guarantees of Origin are issued for energy produced from sources eligible for a Guarantee of Origin.
  • Supervisory bodies approved by the Energy Authority verify that the plant’s production methods, energy sources, production reporting practices and measurement arrangements comply with the requirements of Guarantee of Origin registration.
  • Guarantees of Origin are issued by three registrars:
    • the transmission system operator Finextra Oy (electricity)
    • the Energy Authority (heating and cooling)
    • the gas transmission system operator Gasgrid Finland Oy (gas and hydrogen)