Using waste heat from wastewater for district heating
The heat pump station operating in conjunction with the Suomenoja power plant in Espoo recovers all the waste heat in the city’s wastewater for use in district heating. The heat pumps produce up to 15% of Espoo’s total district heat demand.
The heat pump solution significantly reduces emissions from district heat production in Espoo by replacing fossil fuels used in the heat production with recovered waste heat.
Recovering waste heat from data centres
We are already providing cost-efficient cooling and heat recovery systems for data centres in Stockholm, Sweden and Espoo, Finland. The waste heat from data centres is recovered and returned to the district heating network.
About 20 gigawatt-hours of heat is recovered annually from the Tieto and Elisa data centres in Espoo, equivalent to the annual thermal energy consumption of about 1,000 single-family homes. The energy efficiency of the data centres is increasing significantly, as all the thermal energy generated by the servers can be utilised throughout the year.
Recovering waste heat generated at the Espoo hospital
The Espoo hospital will be the first user of the open district heat solution in Finland. In the traditional approach to cooling a building, surplus heat is removed without being put to use. In the new hospital, the surplus heat that is generated will be removed from the building via a district heat network to provide heat for other heat users in Espoo.
Geothermal heat production pilot project in Espoo
St1 and Fortum’s pilot project will test the utilisation of geothermal heat in district heat production. The goal is to build Finland’s first industrial-scale geothermal heat plant. This solution could cover up to 10% of Espoo’s district heat demand.
Geothermal energy is produced by drilling two holes several kilometres deep into the ground. Water is fed into one of the holes. As the water heats up in the ground, it rises through the other hole. At the heat plant, the heated water goes through a heat exchanger and then into the district heating network.
Pellets and bio-oil replacing fossil fuels in Espoo
The Kivenlahti heat plant in Espoo will use wood pellets instead of heavy fuel oil. Transitioning to the renewable fuel will significantly reduce the area’s carbon dioxide emissions from heat production.
The bio-oil we produce in Joensuu is replacing the fuel oil at the Vermo heat plant in Espoo. Bio-oil use has significant positive environmental impacts because the energy produced with bio-oil reduces greenhouse gas emissions by over 90% compared to fossil fuels. Forest residues and other wood biomass are the raw materials used in the production of bio-oil.