this post was submitted on 30 Nov 2025
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All large cities in Finland are heated by combined heat and power (CHP) power plants.
These power plants first make super heated steam (like 800°C, 1500°F), runs that through turbine to make electricity, then send the cooled down water (80-150°C, 170°F-300°F) to all homes through district heating grid.
From that water the home is heated and hot water is used.
Now that we have the district heating network, when electricity is cheap, we can also use electricity to boil the water and send it through the grid. Water is also easy to use as storage, if the need of consumption requires buffering.
Smaller cities use just heat plants, were there is no turbine for electricity generation, just the heating of water to district heating grid.
Most plants use biomass as power source in the power plants, historically they were coal, but it has been now almost completely phased out.